[PATCH 00/16] treewide: fix match_string() helper when array size

[PATCH 00/16] treewide: fix match_string() helper when array size

[Alexandru Ardelean]

The intent of this patch series is to make a case for fixing the
match_string() string helper.

The doc-string of the `__sysfs_match_string()` helper mentions that `n`
(the size of the given array) should be:
 * @n: number of strings in the array or -1 for NULL terminated arrays

However, this is not the case.
The helper stops on the first NULL in the array, regardless of whether -1
is provided or not.

There are some advantages to allowing this behavior (NULL elements within
in the array). One example, is to allow reserved registers as NULL in an
array.
One example in the series is patch:
   x86/mtrr: use new match_string() helper + add gaps == minor fix
which uses a "?" string for values that are reserved/don't care.

Since the change is a bit big, the change was coupled with renaming
match_string() -> __match_string().
The new match_string() helper (resulted here) does an ARRAY_SIZE() over the
array, which is useful when the array is static. 

Also, this way of doing things is a way to go through all the users of this
helpers and check that nothing goes wrong, and notify them about the change
to match_string().
It's a way of grouping changes in a manage-able way.

The first patch is important, the others can be dropped.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Alexandru Ardelean (16):
  lib: fix match_string() helper when array size is positive
  treewide: rename match_string() -> __match_string()
  lib,treewide: add new match_string() helper/macro
  powerpc/xmon: use new match_string() helper/macro
  ALSA: oxygen: use new match_string() helper/macro
  x86/mtrr: use new match_string() helper + add gaps == minor fix
  device connection: use new match_string() helper/macro
  cpufreq/intel_pstate: remove NULL entry + use match_string()
  mmc: sdhci-xenon: use new match_string() helper/macro
  pinctrl: armada-37xx: use new match_string() helper/macro
  mm/vmpressure.c: use new match_string() helper/macro
  rdmacg: use new match_string() helper/macro
  drm/edid: use new match_string() helper/macro
  staging: gdm724x: use new match_string() helper/macro
  video: fbdev: pxafb: use new match_string() helper/macro
  sched: debug: use new match_string() helper/macro

 arch/powerpc/xmon/xmon.c                         |  2 +-
 arch/x86/kernel/cpu/mtrr/if.c                    | 10 ++++++----
 drivers/ata/pata_hpt366.c                        |  2 +-
 drivers/ata/pata_hpt37x.c                        |  2 +-
 drivers/base/devcon.c                            |  2 +-
 drivers/base/property.c                          |  2 +-
 drivers/clk/bcm/clk-bcm2835.c                    |  4 +---
 drivers/clk/clk.c                                |  4 ++--
 drivers/clk/rockchip/clk.c                       |  4 ++--
 drivers/cpufreq/intel_pstate.c                   |  9 ++++-----
 drivers/gpio/gpiolib-of.c                        |  2 +-
 drivers/gpu/drm/drm_edid_load.c                  |  2 +-
 drivers/gpu/drm/drm_panel_orientation_quirks.c   |  2 +-
 drivers/gpu/drm/i915/intel_pipe_crc.c            |  2 +-
 drivers/ide/hpt366.c                             |  2 +-
 drivers/mfd/omap-usb-host.c                      |  2 +-
 drivers/mmc/host/sdhci-xenon-phy.c               | 12 ++++++------
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c |  2 +-
 drivers/pci/pcie/aer.c                           |  2 +-
 drivers/phy/tegra/xusb.c                         |  2 +-
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c      |  4 ++--
 drivers/pinctrl/pinmux.c                         |  2 +-
 drivers/power/supply/ab8500_btemp.c              |  2 +-
 drivers/power/supply/ab8500_charger.c            |  2 +-
 drivers/power/supply/ab8500_fg.c                 |  2 +-
 drivers/power/supply/abx500_chargalg.c           |  2 +-
 drivers/power/supply/charger-manager.c           |  4 ++--
 drivers/staging/gdm724x/gdm_tty.c                |  3 +--
 drivers/usb/common/common.c                      |  4 ++--
 drivers/usb/typec/class.c                        |  8 +++-----
 drivers/usb/typec/tps6598x.c                     |  2 +-
 drivers/vfio/vfio.c                              |  4 +---
 drivers/video/fbdev/pxafb.c                      |  4 ++--
 fs/ubifs/auth.c                                  |  4 ++--
 include/linux/string.h                           | 11 ++++++++++-
 kernel/cgroup/rdma.c                             |  2 +-
 kernel/sched/debug.c                             |  2 +-
 kernel/trace/trace.c                             |  2 +-
 lib/string.c                                     | 13 ++++++++-----
 mm/mempolicy.c                                   |  2 +-
 mm/vmpressure.c                                  |  4 ++--
 security/apparmor/lsm.c                          |  4 ++--
 security/integrity/ima/ima_main.c                |  2 +-
 sound/firewire/oxfw/oxfw.c                       |  2 +-
 sound/pci/oxygen/oxygen_mixer.c                  |  2 +-
 sound/soc/codecs/max98088.c                      |  2 +-
 sound/soc/codecs/max98095.c                      |  2 +-
 sound/soc/soc-dapm.c                             |  2 +-
 48 files changed, 88 insertions(+), 82 deletions(-)

-- 
2.17.1

[PATCH 01/16] lib: fix match_string() helper on -1 array size

[Alexandru Ardelean]

The documentation the `_match_string()` helper mentions that `n`
should be:
 * @n: number of strings in the array or -1 for NULL terminated arrays

The behavior of the function is different, in the sense that it exits on
the first NULL element in the array, regardless of whether `n` is -1 or a
positive number.

This patch changes the behavior, to exit the loop when a NULL element is
found and n == -1. Essentially, this aligns the behavior with the
doc-string.

There are currently many users of `match_string()`, and so, in order to go
through them, the next patches in the series will focus on doing some
cosmetic changes, which are aimed at grouping the users of
`match_string()`.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 lib/string.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/string.c b/lib/string.c
index 3ab861c1a857..76edb7bf76cb 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -648,8 +648,11 @@ int match_string(const char * const *array, size_t n, const char *string)
 
 	for (index = 0; index < n; index++) {
 		item = array[index];
-		if (!item)
+		if (!item) {
+			if (n != (size_t)-1)
+				continue;
 			break;
+		}
 		if (!strcmp(item, string))
 			return index;
 	}
-- 
2.17.1

Re: [PATCH 01/16] lib: fix match_string() helper on -1 array size

[Ardelean, Alexandru]

On Wed, 2019-05-08 at 14:28 +0300, Alexandru Ardelean wrote:
> The documentation the `_match_string()` helper mentions that `n`
> should be:
>  * @n: number of strings in the array or -1 for NULL terminated arrays
> 
> The behavior of the function is different, in the sense that it exits on
> the first NULL element in the array, regardless of whether `n` is -1 or a
> positive number.
> 
> This patch changes the behavior, to exit the loop when a NULL element is
> found and n == -1. Essentially, this aligns the behavior with the
> doc-string.
> 
> There are currently many users of `match_string()`, and so, in order to
> go
> through them, the next patches in the series will focus on doing some
> cosmetic changes, which are aimed at grouping the users of
> `match_string()`.
> 

This is the duplicate & should be dropped.
Sorry for this.

> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>  lib/string.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/string.c b/lib/string.c
> index 3ab861c1a857..76edb7bf76cb 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -648,8 +648,11 @@ int match_string(const char * const *array, size_t
> n, const char *string)
>  
>  	for (index = 0; index < n; index++) {
>  		item = array[index];
> -		if (!item)
> +		if (!item) {
> +			if (n != (size_t)-1)
> +				continue;
>  			break;
> +		}
>  		if (!strcmp(item, string))
>  			return index;
>  	}

[PATCH 01/16] lib: fix match_string() helper when array size is positive

[Alexandru Ardelean]

The documentation the `_match_string()` helper mentions that `n`
(size of the given array) should be:
 * @n: number of strings in the array or -1 for NULL terminated arrays

The behavior of the function is different, in the sense that it exits on
the first NULL element in the array, regardless of whether `n` is -1 or a
positive number.

This patch changes the behavior, to exit the loop when a NULL element is
found and n == -1. Essentially, this aligns the behavior with the
doc-string.

There are currently many users of `match_string()`, and so, in order to go
through them, the next patches in the series will focus on doing some
cosmetic changes, which are aimed at grouping the users of
`match_string()`.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 lib/string.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/string.c b/lib/string.c
index 3ab861c1a857..76edb7bf76cb 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -648,8 +648,11 @@ int match_string(const char * const *array, size_t n, const char *string)
 
 	for (index = 0; index < n; index++) {
 		item = array[index];
-		if (!item)
+		if (!item) {
+			if (n != (size_t)-1)
+				continue;
 			break;
+		}
 		if (!strcmp(item, string))
 			return index;
 	}
-- 
2.17.1

[PATCH 02/16] treewide: rename match_string() -> __match_string()

[Alexandru Ardelean]

This change does a rename of match_string() -> __match_string().

There are a few parts to the intention here (with this change):
1. Align with sysfs_match_string()/__sysfs_match_string()
2. This helps to group users of `match_string()` into simple users:
   a. those that use ARRAY_SIZE(_a) to specify the number of elements
   b. those that use -1 to pass a NULL terminated array of strings
   c. special users, which (after eliminating 1 & 2) are not that many
3. The final intent is to fix match_string()/__match_string() which is
   slightly broken, in the sense that passing -1 or a positive value does
   not make any difference: the iteration will stop at the first NULL
   element.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 arch/powerpc/xmon/xmon.c                         |  2 +-
 arch/x86/kernel/cpu/mtrr/if.c                    |  2 +-
 drivers/ata/pata_hpt366.c                        |  2 +-
 drivers/ata/pata_hpt37x.c                        |  2 +-
 drivers/base/devcon.c                            |  2 +-
 drivers/base/property.c                          |  2 +-
 drivers/clk/bcm/clk-bcm2835.c                    |  6 +++---
 drivers/clk/clk.c                                |  4 ++--
 drivers/clk/rockchip/clk.c                       |  4 ++--
 drivers/cpufreq/intel_pstate.c                   |  2 +-
 drivers/gpio/gpiolib-of.c                        |  2 +-
 drivers/gpu/drm/drm_edid_load.c                  |  2 +-
 drivers/gpu/drm/drm_panel_orientation_quirks.c   |  2 +-
 drivers/gpu/drm/i915/intel_pipe_crc.c            |  2 +-
 drivers/ide/hpt366.c                             |  2 +-
 drivers/mfd/omap-usb-host.c                      |  2 +-
 drivers/mmc/host/sdhci-xenon-phy.c               |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c |  2 +-
 drivers/pci/pcie/aer.c                           |  2 +-
 drivers/phy/tegra/xusb.c                         |  2 +-
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c      |  4 ++--
 drivers/pinctrl/pinmux.c                         |  2 +-
 drivers/power/supply/ab8500_btemp.c              |  2 +-
 drivers/power/supply/ab8500_charger.c            |  2 +-
 drivers/power/supply/ab8500_fg.c                 |  2 +-
 drivers/power/supply/abx500_chargalg.c           |  2 +-
 drivers/power/supply/charger-manager.c           |  4 ++--
 drivers/staging/gdm724x/gdm_tty.c                |  4 ++--
 drivers/usb/common/common.c                      |  4 ++--
 drivers/usb/typec/class.c                        | 10 +++++-----
 drivers/usb/typec/tps6598x.c                     |  2 +-
 drivers/vfio/vfio.c                              |  6 +++---
 drivers/video/fbdev/pxafb.c                      |  2 +-
 fs/ubifs/auth.c                                  |  4 ++--
 include/linux/string.h                           |  2 +-
 kernel/cgroup/rdma.c                             |  2 +-
 kernel/sched/debug.c                             |  2 +-
 kernel/trace/trace.c                             |  2 +-
 lib/string.c                                     |  8 ++++----
 mm/mempolicy.c                                   |  2 +-
 mm/vmpressure.c                                  |  4 ++--
 security/apparmor/lsm.c                          |  4 ++--
 security/integrity/ima/ima_main.c                |  2 +-
 sound/firewire/oxfw/oxfw.c                       |  2 +-
 sound/pci/oxygen/oxygen_mixer.c                  |  2 +-
 sound/soc/codecs/max98088.c                      |  2 +-
 sound/soc/codecs/max98095.c                      |  2 +-
 sound/soc/soc-dapm.c                             |  2 +-
 48 files changed, 68 insertions(+), 68 deletions(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index a0f44f992360..efca104ac0cb 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3231,7 +3231,7 @@ scanhex(unsigned long *vp)
 			regname[i] = c;
 		}
 		regname[i] = 0;
-		i = match_string(regnames, N_PTREGS, regname);
+		i = __match_string(regnames, N_PTREGS, regname);
 		if (i < 0) {
 			printf("invalid register name '%%%s'\n", regname);
 			return 0;
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 4d36dcc1cf87..4ec7a5f7b94c 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -142,7 +142,7 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
 		return -EINVAL;
 	ptr = skip_spaces(ptr + 5);
 
-	i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
+	i = __match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
 	if (i < 0)
 		return i;
 
diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c
index a219a503c229..4ba5fc9d20be 100644
--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -180,7 +180,7 @@ static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr,
 
 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-	i = match_string(list, -1, model_num);
+	i = __match_string(list, -1, model_num);
 	if (i >= 0) {
 		pr_warn("%s is not supported for %s\n", modestr, list[i]);
 		return 1;
diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index ef8aaeb0c575..ce21f01dad04 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -228,7 +228,7 @@ static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr,
 
 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-	i = match_string(list, -1, model_num);
+	i = __match_string(list, -1, model_num);
 	if (i >= 0) {
 		pr_warn("%s is not supported for %s\n", modestr, list[i]);
 		return 1;
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 04db9ae235e4..7bc1c619b721 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -70,7 +70,7 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
 	mutex_lock(&devcon_lock);
 
 	list_for_each_entry(con, &devcon_list, list) {
-		ep = match_string(con->endpoint, 2, devname);
+		ep = __match_string(con->endpoint, 2, devname);
 		if (ep < 0)
 			continue;
 
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 8b91ab380d14..4639275f55fe 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -443,7 +443,7 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode,
 	if (ret < 0)
 		goto out;
 
-	ret = match_string(values, nval, string);
+	ret = __match_string(values, nval, string);
 	if (ret < 0)
 		ret = -ENODATA;
 out:
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 9fcae932e082..a775f6a1f717 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1390,9 +1390,9 @@ static struct clk_hw *bcm2835_register_clock(struct bcm2835_cprman *cprman,
 	for (i = 0; i < data->num_mux_parents; i++) {
 		parents[i] = data->parents[i];
 
-		ret = match_string(cprman_parent_names,
-				   ARRAY_SIZE(cprman_parent_names),
-				   parents[i]);
+		ret = __match_string(cprman_parent_names,
+				     ARRAY_SIZE(cprman_parent_names),
+				     parents[i]);
 		if (ret >= 0)
 			parents[i] = cprman->real_parent_names[ret];
 	}
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 96053a96fe2f..0b6c3d300411 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2305,8 +2305,8 @@ bool clk_has_parent(struct clk *clk, struct clk *parent)
 	if (core->parent == parent_core)
 		return true;
 
-	return match_string(core->parent_names, core->num_parents,
-			    parent_core->name) >= 0;
+	return __match_string(core->parent_names, core->num_parents,
+			      parent_core->name) >= 0;
 }
 EXPORT_SYMBOL_GPL(clk_has_parent);
 
diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index c3ad92965823..373f13e9cd83 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -276,8 +276,8 @@ static struct clk *rockchip_clk_register_frac_branch(
 		struct clk *mux_clk;
 		int ret;
 
-		frac->mux_frac_idx = match_string(child->parent_names,
-						  child->num_parents, name);
+		frac->mux_frac_idx = __match_string(child->parent_names,
+						    child->num_parents, name);
 		frac->mux_ops = &clk_mux_ops;
 		frac->clk_nb.notifier_call = rockchip_clk_frac_notifier_cb;
 
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 2986119dd31f..6ed1e705bc05 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -701,7 +701,7 @@ static ssize_t store_energy_performance_preference(
 	if (ret != 1)
 		return -EINVAL;
 
-	ret = match_string(energy_perf_strings, -1, str_preference);
+	ret = __match_string(energy_perf_strings, -1, str_preference);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 6a3ec575a404..27d6f04ab58e 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -279,7 +279,7 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
 	if (!con_id)
 		return ERR_PTR(-ENOENT);
 
-	i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
+	i = __match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
 	if (i < 0)
 		return ERR_PTR(-ENOENT);
 
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index a4915099aaa9..1450051972ea 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -186,7 +186,7 @@ static void *edid_load(struct drm_connector *connector, const char *name,
 	int i, valid_extensions = 0;
 	bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
 
-	builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
+	builtin = __match_string(generic_edid_name, GENERIC_EDIDS, name);
 	if (builtin >= 0) {
 		fwdata = generic_edid[builtin];
 		fwsize = sizeof(generic_edid[builtin]);
diff --git a/drivers/gpu/drm/drm_panel_orientation_quirks.c b/drivers/gpu/drm/drm_panel_orientation_quirks.c
index 52e445bb1aa5..8f7f31a1248c 100644
--- a/drivers/gpu/drm/drm_panel_orientation_quirks.c
+++ b/drivers/gpu/drm/drm_panel_orientation_quirks.c
@@ -200,7 +200,7 @@ int drm_get_panel_orientation_quirk(int width, int height)
 		if (!bios_date)
 			continue;
 
-		i = match_string(data->bios_dates, -1, bios_date);
+		i = __match_string(data->bios_dates, -1, bios_date);
 		if (i >= 0)
 			return data->orientation;
 	}
diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index a8554dc4f196..286fad1f0e08 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -449,7 +449,7 @@ display_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *s)
 		return 0;
 	}
 
-	i = match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
+	i = __match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
 	if (i < 0)
 		return i;
 
diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c
index 0a3f9bcc8b04..1c4052fd02ab 100644
--- a/drivers/ide/hpt366.c
+++ b/drivers/ide/hpt366.c
@@ -533,7 +533,7 @@ static const struct hpt_info hpt371n = {
 
 static bool check_in_drive_list(ide_drive_t *drive, const char **list)
 {
-	return match_string(list, -1, (char *)&drive->id[ATA_ID_PROD]) >= 0;
+	return __match_string(list, -1, (char *)&drive->id[ATA_ID_PROD]) >= 0;
 }
 
 static struct hpt_info *hpt3xx_get_info(struct device *dev)
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 800986a79704..9aaacb5bdb26 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -509,7 +509,7 @@ static int usbhs_omap_get_dt_pdata(struct device *dev,
 			continue;
 
 		/* get 'enum usbhs_omap_port_mode' from port mode string */
-		ret = match_string(port_modes, ARRAY_SIZE(port_modes), mode);
+		ret = __match_string(port_modes, ARRAY_SIZE(port_modes), mode);
 		if (ret < 0) {
 			dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
 					i, mode);
diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index 8d07ee1b8f08..59b7a6cac995 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -821,7 +821,7 @@ static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	int ret;
 
-	priv->phy_type = match_string(phy_types, NR_PHY_TYPES, phy_name);
+	priv->phy_type = __match_string(phy_types, NR_PHY_TYPES, phy_name);
 	if (priv->phy_type < 0) {
 		dev_err(mmc_dev(host->mmc),
 			"Unable to determine PHY name %s. Use default eMMC 5.1 PHY\n",
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 776b24f54200..59ce3ff35553 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -667,7 +667,7 @@ iwl_dbgfs_bt_force_ant_write(struct iwl_mvm *mvm, char *buf,
 	};
 	int ret, bt_force_ant_mode;
 
-	ret = match_string(modes_str, ARRAY_SIZE(modes_str), buf);
+	ret = __match_string(modes_str, ARRAY_SIZE(modes_str), buf);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f8fc2114ad39..41a0773a1cbc 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -203,7 +203,7 @@ void pcie_ecrc_get_policy(char *str)
 {
 	int i;
 
-	i = match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
+	i = __match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
 	if (i < 0)
 		return;
 
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 5b3b8863363e..d5686b5db107 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -113,7 +113,7 @@ int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
 	if (err < 0)
 		return err;
 
-	err = match_string(lane->soc->funcs, lane->soc->num_funcs, function);
+	err = __match_string(lane->soc->funcs, lane->soc->num_funcs, function);
 	if (err < 0) {
 		dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n",
 			function, np);
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
index 6462d3ca7ceb..07a5bcaa0067 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -348,7 +348,7 @@ static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev,
 	dev_dbg(info->dev, "enable function %s group %s\n",
 		name, grp->name);
 
-	func = match_string(grp->funcs, NB_FUNCS, name);
+	func = __match_string(grp->funcs, NB_FUNCS, name);
 	if (func < 0)
 		return -ENOTSUPP;
 
@@ -938,7 +938,7 @@ static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info)
 			struct armada_37xx_pin_group *gp = &info->groups[g];
 			int f;
 
-			f = match_string(gp->funcs, NB_FUNCS, name);
+			f = __match_string(gp->funcs, NB_FUNCS, name);
 			if (f < 0)
 				continue;
 
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 4d0cc1889dd9..041326d0ab7b 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -348,7 +348,7 @@ int pinmux_map_to_setting(const struct pinctrl_map *map,
 	}
 	if (map->data.mux.group) {
 		group = map->data.mux.group;
-		ret = match_string(groups, num_groups, group);
+		ret = __match_string(groups, num_groups, group);
 		if (ret < 0) {
 			dev_err(pctldev->dev,
 				"invalid group \"%s\" for function \"%s\"\n",
diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 708fd58cd62b..1cf3b43a41e4 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -858,7 +858,7 @@ static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
 	 * For all psy where the name of your driver
 	 * appears in any supplied_to
 	 */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index 98b335042ba6..8094f38e4085 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -1876,7 +1876,7 @@ static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
 	di = to_ab8500_charger_usb_device_info(usb_chg);
 
 	/* For all psy where the driver name appears in any supplied_to */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 776102c31305..408339c5a4a8 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2174,7 +2174,7 @@ static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
 	 * For all psy where the name of your driver
 	 * appears in any supplied_to
 	 */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/abx500_chargalg.c b/drivers/power/supply/abx500_chargalg.c
index 947709cdd14e..b2fcd0ba379d 100644
--- a/drivers/power/supply/abx500_chargalg.c
+++ b/drivers/power/supply/abx500_chargalg.c
@@ -946,7 +946,7 @@ static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
 	psy = (struct power_supply *)data;
 	di = power_supply_get_drvdata(psy);
 	/* For all psy where the driver name appears in any supplied_to */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c
index 2e8db5e6de0b..27a8ba63563e 100644
--- a/drivers/power/supply/charger-manager.c
+++ b/drivers/power/supply/charger-manager.c
@@ -2019,8 +2019,8 @@ void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
 
 	mutex_lock(&cm_list_mtx);
 	list_for_each_entry(cm, &cm_list, entry) {
-		if (match_string(cm->desc->psy_charger_stat, -1,
-				 psy->desc->name) >= 0) {
+		if (__match_string(cm->desc->psy_charger_stat, -1,
+				   psy->desc->name) >= 0) {
 			found_power_supply = true;
 			break;
 		}
diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 6e813693a766..6e147a324652 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -56,8 +56,8 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 	struct gdm *gdm = NULL;
 	int ret;
 
-	ret = match_string(DRIVER_STRING, TTY_MAX_COUNT,
-			   tty->driver->driver_name);
+	ret = __match_string(DRIVER_STRING, TTY_MAX_COUNT,
+			     tty->driver->driver_name);
 	if (ret < 0)
 		return -ENODEV;
 
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 73c8e6591746..bca0c404c6ca 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -68,7 +68,7 @@ enum usb_device_speed usb_get_maximum_speed(struct device *dev)
 	if (ret < 0)
 		return USB_SPEED_UNKNOWN;
 
-	ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
+	ret = __match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
 
 	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
 }
@@ -106,7 +106,7 @@ static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
 {
 	int ret;
 
-	ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
+	ret = __match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
 	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
 }
 
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 2eb623841847..4abc5a76ec51 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1409,8 +1409,8 @@ EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
  */
 int typec_find_port_power_role(const char *name)
 {
-	return match_string(typec_port_power_roles,
-			    ARRAY_SIZE(typec_port_power_roles), name);
+	return __match_string(typec_port_power_roles,
+			      ARRAY_SIZE(typec_port_power_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_power_role);
 
@@ -1424,7 +1424,7 @@ EXPORT_SYMBOL_GPL(typec_find_port_power_role);
  */
 int typec_find_power_role(const char *name)
 {
-	return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
+	return __match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_power_role);
 
@@ -1438,8 +1438,8 @@ EXPORT_SYMBOL_GPL(typec_find_power_role);
  */
 int typec_find_port_data_role(const char *name)
 {
-	return match_string(typec_port_data_roles,
-			    ARRAY_SIZE(typec_port_data_roles), name);
+	return __match_string(typec_port_data_roles,
+			      ARRAY_SIZE(typec_port_data_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_data_role);
 
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index c674abe3cf99..0389e4391faf 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -423,7 +423,7 @@ static int tps6598x_check_mode(struct tps6598x *tps)
 	if (ret)
 		return ret;
 
-	switch (match_string(modes, ARRAY_SIZE(modes), mode)) {
+	switch (__match_string(modes, ARRAY_SIZE(modes), mode)) {
 	case TPS_MODE_APP:
 		return 0;
 	case TPS_MODE_BOOT:
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index a3030cdf3c18..b31585ecf48f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -637,9 +637,9 @@ static bool vfio_dev_whitelisted(struct device *dev, struct device_driver *drv)
 			return true;
 	}
 
-	return match_string(vfio_driver_whitelist,
-			    ARRAY_SIZE(vfio_driver_whitelist),
-			    drv->name) >= 0;
+	return __match_string(vfio_driver_whitelist,
+			      ARRAY_SIZE(vfio_driver_whitelist),
+			      drv->name) >= 0;
 }
 
 /*
diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index d59c8a59f582..0025781e6e1e 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -2129,7 +2129,7 @@ static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
 	if (ret)
 		s = "color-tft";
 
-	i = match_string(lcd_types, -1, s);
+	i = __match_string(lcd_types, -1, s);
 	if (i < 0) {
 		dev_err(dev, "lcd-type %s is unknown\n", s);
 		return i;
diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index 5bf5fd08879e..43742d76b203 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -235,8 +235,8 @@ int ubifs_init_authentication(struct ubifs_info *c)
 		return -EINVAL;
 	}
 
-	c->auth_hash_algo = match_string(hash_algo_name, HASH_ALGO__LAST,
-					 c->auth_hash_name);
+	c->auth_hash_algo = __match_string(hash_algo_name, HASH_ALGO__LAST,
+					   c->auth_hash_name);
 	if ((int)c->auth_hash_algo < 0) {
 		ubifs_err(c, "Unknown hash algo %s specified",
 			  c->auth_hash_name);
diff --git a/include/linux/string.h b/include/linux/string.h
index 6ab0a6fa512e..531d04308ff9 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -191,7 +191,7 @@ static inline int strtobool(const char *s, bool *res)
 	return kstrtobool(s, res);
 }
 
-int match_string(const char * const *array, size_t n, const char *string);
+int __match_string(const char * const *array, size_t n, const char *string);
 int __sysfs_match_string(const char * const *array, size_t n, const char *s);
 
 /**
diff --git a/kernel/cgroup/rdma.c b/kernel/cgroup/rdma.c
index 1d75ae7f1cb7..65d4df148603 100644
--- a/kernel/cgroup/rdma.c
+++ b/kernel/cgroup/rdma.c
@@ -367,7 +367,7 @@ static int parse_resource(char *c, int *intval)
 	if (!name || !value)
 		return -EINVAL;
 
-	i = match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name);
+	i = __match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name);
 	if (i < 0)
 		return i;
 
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 8039d62ae36e..b0efc5fe641e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -111,7 +111,7 @@ static int sched_feat_set(char *cmp)
 		cmp += 3;
 	}
 
-	i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
+	i = __match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
 	if (i < 0)
 		return i;
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ca1ee656d6d8..d9146141d9d8 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4602,7 +4602,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
 
 	mutex_lock(&trace_types_lock);
 
-	ret = match_string(trace_options, -1, cmp);
+	ret = __match_string(trace_options, -1, cmp);
 	/* If no option could be set, test the specific tracer options */
 	if (ret < 0)
 		ret = set_tracer_option(tr, cmp, neg);
diff --git a/lib/string.c b/lib/string.c
index 76edb7bf76cb..2d5f0afef1f2 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -633,7 +633,7 @@ bool sysfs_streq(const char *s1, const char *s2)
 EXPORT_SYMBOL(sysfs_streq);
 
 /**
- * match_string - matches given string in an array
+ * __match_string - matches given string in an array
  * @array:	array of strings
  * @n:		number of strings in the array or -1 for NULL terminated arrays
  * @string:	string to match with
@@ -641,7 +641,7 @@ EXPORT_SYMBOL(sysfs_streq);
  * Return:
  * index of a @string in the @array if matches, or %-EINVAL otherwise.
  */
-int match_string(const char * const *array, size_t n, const char *string)
+int __match_string(const char * const *array, size_t n, const char *string)
 {
 	int index;
 	const char *item;
@@ -659,7 +659,7 @@ int match_string(const char * const *array, size_t n, const char *string)
 
 	return -EINVAL;
 }
-EXPORT_SYMBOL(match_string);
+EXPORT_SYMBOL(__match_string);
 
 /**
  * __sysfs_match_string - matches given string in an array
@@ -667,7 +667,7 @@ EXPORT_SYMBOL(match_string);
  * @n: number of strings in the array or -1 for NULL terminated arrays
  * @str: string to match with
  *
- * Returns index of @str in the @array or -EINVAL, just like match_string().
+ * Returns index of @str in the @array or -EINVAL, just like __match_string().
  * Uses sysfs_streq instead of strcmp for matching.
  */
 int __sysfs_match_string(const char * const *array, size_t n, const char *str)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2219e747df49..97bcf4658317 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2755,7 +2755,7 @@ int mpol_parse_str(char *str, struct mempolicy **mpol)
 	if (flags)
 		*flags++ = '\0';	/* terminate mode string */
 
-	mode = match_string(policy_modes, MPOL_MAX, str);
+	mode = __match_string(policy_modes, MPOL_MAX, str);
 	if (mode < 0)
 		goto out;
 
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 4854584ec436..d43f33139568 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -378,7 +378,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 
 	/* Find required level */
 	token = strsep(&spec, ",");
-	level = match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, token);
+	level = __match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, token);
 	if (level < 0) {
 		ret = level;
 		goto out;
@@ -387,7 +387,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 	/* Find optional mode */
 	token = strsep(&spec, ",");
 	if (token) {
-		mode = match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, token);
+		mode = __match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, token);
 		if (mode < 0) {
 			ret = mode;
 			goto out;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 87500bde5a92..45d28db85e5a 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1480,7 +1480,7 @@ static int param_set_audit(const char *val, const struct kernel_param *kp)
 	if (apparmor_initialized && !policy_admin_capable(NULL))
 		return -EPERM;
 
-	i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
+	i = __match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
 	if (i < 0)
 		return -EINVAL;
 
@@ -1509,7 +1509,7 @@ static int param_set_mode(const char *val, const struct kernel_param *kp)
 	if (apparmor_initialized && !policy_admin_capable(NULL))
 		return -EPERM;
 
-	i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
+	i = __match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
 			 val);
 	if (i < 0)
 		return -EINVAL;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 357edd140c09..618842f85f2d 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -61,7 +61,7 @@ static int __init hash_setup(char *str)
 		goto out;
 	}
 
-	i = match_string(hash_algo_name, HASH_ALGO__LAST, str);
+	i = __match_string(hash_algo_name, HASH_ALGO__LAST, str);
 	if (i < 0)
 		return 1;
 
diff --git a/sound/firewire/oxfw/oxfw.c b/sound/firewire/oxfw/oxfw.c
index 3d27f3378d5d..9ec5316f3bb5 100644
--- a/sound/firewire/oxfw/oxfw.c
+++ b/sound/firewire/oxfw/oxfw.c
@@ -57,7 +57,7 @@ static bool detect_loud_models(struct fw_unit *unit)
 	if (err < 0)
 		return false;
 
-	return match_string(models, ARRAY_SIZE(models), model) >= 0;
+	return __match_string(models, ARRAY_SIZE(models), model) >= 0;
 }
 
 static int name_card(struct snd_oxfw *oxfw)
diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index 81af21ac1439..13c2fb75fd71 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -1086,7 +1086,7 @@ static int add_controls(struct oxygen *chip,
 		err = snd_ctl_add(chip->card, ctl);
 		if (err < 0)
 			return err;
-		j = match_string(known_ctl_names, CONTROL_COUNT, ctl->id.name);
+		j = __match_string(known_ctl_names, CONTROL_COUNT, ctl->id.name);
 		if (j >= 0) {
 			chip->controls[j] = ctl;
 			ctl->private_free = oxygen_any_ctl_free;
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index ca172a4b6849..3ef743075bda 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -1405,7 +1405,7 @@ static int max98088_get_channel(struct snd_soc_component *component, const char
 {
 	int ret;
 
-	ret = match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
+	ret = __match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad EQ channel name '%s'\n", name);
 	return ret;
diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index 3b3a10da7f40..cd69916d5dcb 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -1636,7 +1636,7 @@ static int max98095_get_bq_channel(struct snd_soc_component *component,
 {
 	int ret;
 
-	ret = match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
+	ret = __match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad biquad channel name '%s'\n", name);
 	return ret;
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 0382a47b30bd..c9a1e27e5839 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -753,7 +753,7 @@ static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
 		item = 0;
 	}
 
-	i = match_string(e->texts, e->items, control_name);
+	i = __match_string(e->texts, e->items, control_name);
 	if (i < 0)
 		return -ENODEV;
 
-- 
2.17.1

[PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Alexandru Ardelean]

This change re-introduces `match_string()` as a macro that uses
ARRAY_SIZE() to compute the size of the array.
The macro is added in all the places that do
`match_string(_a, ARRAY_SIZE(_a), s)`, since the change is pretty
straightforward.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/clk/bcm/clk-bcm2835.c                    | 4 +---
 drivers/gpio/gpiolib-of.c                        | 2 +-
 drivers/gpu/drm/i915/intel_pipe_crc.c            | 2 +-
 drivers/mfd/omap-usb-host.c                      | 2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c | 2 +-
 drivers/pci/pcie/aer.c                           | 2 +-
 drivers/usb/common/common.c                      | 4 ++--
 drivers/usb/typec/class.c                        | 8 +++-----
 drivers/usb/typec/tps6598x.c                     | 2 +-
 drivers/vfio/vfio.c                              | 4 +---
 include/linux/string.h                           | 9 +++++++++
 sound/firewire/oxfw/oxfw.c                       | 2 +-
 sound/soc/codecs/max98088.c                      | 2 +-
 sound/soc/codecs/max98095.c                      | 2 +-
 14 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index a775f6a1f717..1ab388590ead 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1390,9 +1390,7 @@ static struct clk_hw *bcm2835_register_clock(struct bcm2835_cprman *cprman,
 	for (i = 0; i < data->num_mux_parents; i++) {
 		parents[i] = data->parents[i];
 
-		ret = __match_string(cprman_parent_names,
-				     ARRAY_SIZE(cprman_parent_names),
-				     parents[i]);
+		ret = match_string(cprman_parent_names, parents[i]);
 		if (ret >= 0)
 			parents[i] = cprman->real_parent_names[ret];
 	}
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 27d6f04ab58e..71e886869d78 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -279,7 +279,7 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
 	if (!con_id)
 		return ERR_PTR(-ENOENT);
 
-	i = __match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
+	i = match_string(whitelist, con_id);
 	if (i < 0)
 		return ERR_PTR(-ENOENT);
 
diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index 286fad1f0e08..6fc4f3d3d1f6 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -449,7 +449,7 @@ display_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *s)
 		return 0;
 	}
 
-	i = __match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
+	i = match_string(pipe_crc_sources, buf);
 	if (i < 0)
 		return i;
 
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 9aaacb5bdb26..53dff34c0afc 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -509,7 +509,7 @@ static int usbhs_omap_get_dt_pdata(struct device *dev,
 			continue;
 
 		/* get 'enum usbhs_omap_port_mode' from port mode string */
-		ret = __match_string(port_modes, ARRAY_SIZE(port_modes), mode);
+		ret = match_string(port_modes, mode);
 		if (ret < 0) {
 			dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
 					i, mode);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 59ce3ff35553..778b4dfd8b75 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -667,7 +667,7 @@ iwl_dbgfs_bt_force_ant_write(struct iwl_mvm *mvm, char *buf,
 	};
 	int ret, bt_force_ant_mode;
 
-	ret = __match_string(modes_str, ARRAY_SIZE(modes_str), buf);
+	ret = match_string(modes_str, buf);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 41a0773a1cbc..2278caba109c 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -203,7 +203,7 @@ void pcie_ecrc_get_policy(char *str)
 {
 	int i;
 
-	i = __match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
+	i = match_string(ecrc_policy_str, str);
 	if (i < 0)
 		return;
 
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index bca0c404c6ca..5a651d311d38 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -68,7 +68,7 @@ enum usb_device_speed usb_get_maximum_speed(struct device *dev)
 	if (ret < 0)
 		return USB_SPEED_UNKNOWN;
 
-	ret = __match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
+	ret = match_string(speed_names, maximum_speed);
 
 	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
 }
@@ -106,7 +106,7 @@ static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
 {
 	int ret;
 
-	ret = __match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
+	ret = match_string(usb_dr_modes, str);
 	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
 }
 
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 4abc5a76ec51..38ac776cba8a 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1409,8 +1409,7 @@ EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
  */
 int typec_find_port_power_role(const char *name)
 {
-	return __match_string(typec_port_power_roles,
-			      ARRAY_SIZE(typec_port_power_roles), name);
+	return match_string(typec_port_power_roles, name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_power_role);
 
@@ -1424,7 +1423,7 @@ EXPORT_SYMBOL_GPL(typec_find_port_power_role);
  */
 int typec_find_power_role(const char *name)
 {
-	return __match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
+	return match_string(typec_roles, name);
 }
 EXPORT_SYMBOL_GPL(typec_find_power_role);
 
@@ -1438,8 +1437,7 @@ EXPORT_SYMBOL_GPL(typec_find_power_role);
  */
 int typec_find_port_data_role(const char *name)
 {
-	return __match_string(typec_port_data_roles,
-			      ARRAY_SIZE(typec_port_data_roles), name);
+	return match_string(typec_port_data_roles, name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_data_role);
 
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index 0389e4391faf..0c4e47868590 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -423,7 +423,7 @@ static int tps6598x_check_mode(struct tps6598x *tps)
 	if (ret)
 		return ret;
 
-	switch (__match_string(modes, ARRAY_SIZE(modes), mode)) {
+	switch (match_string(modes, mode)) {
 	case TPS_MODE_APP:
 		return 0;
 	case TPS_MODE_BOOT:
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index b31585ecf48f..fe8283d3781b 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -637,9 +637,7 @@ static bool vfio_dev_whitelisted(struct device *dev, struct device_driver *drv)
 			return true;
 	}
 
-	return __match_string(vfio_driver_whitelist,
-			      ARRAY_SIZE(vfio_driver_whitelist),
-			      drv->name) >= 0;
+	return match_string(vfio_driver_whitelist, drv->name) >= 0;
 }
 
 /*
diff --git a/include/linux/string.h b/include/linux/string.h
index 531d04308ff9..07e9f89088df 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -194,6 +194,15 @@ static inline int strtobool(const char *s, bool *res)
 int __match_string(const char * const *array, size_t n, const char *string);
 int __sysfs_match_string(const char * const *array, size_t n, const char *s);
 
+/**
+ * match_string - matches given string in an array
+ * @_a: array of strings
+ * @_s: string to match with
+ *
+ * Helper for __match_string(). Calculates the size of @a automatically.
+ */
+#define match_string(_a, _s) __match_string(_a, ARRAY_SIZE(_a), _s)
+
 /**
  * sysfs_match_string - matches given string in an array
  * @_a: array of strings
diff --git a/sound/firewire/oxfw/oxfw.c b/sound/firewire/oxfw/oxfw.c
index 9ec5316f3bb5..433fc84c4f90 100644
--- a/sound/firewire/oxfw/oxfw.c
+++ b/sound/firewire/oxfw/oxfw.c
@@ -57,7 +57,7 @@ static bool detect_loud_models(struct fw_unit *unit)
 	if (err < 0)
 		return false;
 
-	return __match_string(models, ARRAY_SIZE(models), model) >= 0;
+	return match_string(models, model) >= 0;
 }
 
 static int name_card(struct snd_oxfw *oxfw)
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index 3ef743075bda..911ffe84c37e 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -1405,7 +1405,7 @@ static int max98088_get_channel(struct snd_soc_component *component, const char
 {
 	int ret;
 
-	ret = __match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
+	ret = match_string(eq_mode_name, name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad EQ channel name '%s'\n", name);
 	return ret;
diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index cd69916d5dcb..d182d45d0c83 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -1636,7 +1636,7 @@ static int max98095_get_bq_channel(struct snd_soc_component *component,
 {
 	int ret;
 
-	ret = __match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
+	ret = match_string(bq_mode_name, name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad biquad channel name '%s'\n", name);
 	return ret;
-- 
2.17.1

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Andy Shevchenko]

On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean wrote:
> This change re-introduces `match_string()` as a macro that uses
> ARRAY_SIZE() to compute the size of the array.
> The macro is added in all the places that do
> `match_string(_a, ARRAY_SIZE(_a), s)`, since the change is pretty
> straightforward.

Can you split include/linux/ change from the rest?

> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>  drivers/clk/bcm/clk-bcm2835.c                    | 4 +---
>  drivers/gpio/gpiolib-of.c                        | 2 +-
>  drivers/gpu/drm/i915/intel_pipe_crc.c            | 2 +-
>  drivers/mfd/omap-usb-host.c                      | 2 +-
>  drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c | 2 +-
>  drivers/pci/pcie/aer.c                           | 2 +-
>  drivers/usb/common/common.c                      | 4 ++--
>  drivers/usb/typec/class.c                        | 8 +++-----
>  drivers/usb/typec/tps6598x.c                     | 2 +-
>  drivers/vfio/vfio.c                              | 4 +---
>  include/linux/string.h                           | 9 +++++++++
>  sound/firewire/oxfw/oxfw.c                       | 2 +-
>  sound/soc/codecs/max98088.c                      | 2 +-
>  sound/soc/codecs/max98095.c                      | 2 +-
>  14 files changed, 25 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
> index a775f6a1f717..1ab388590ead 100644
> --- a/drivers/clk/bcm/clk-bcm2835.c
> +++ b/drivers/clk/bcm/clk-bcm2835.c
> @@ -1390,9 +1390,7 @@ static struct clk_hw *bcm2835_register_clock(struct bcm2835_cprman *cprman,
>  	for (i = 0; i < data->num_mux_parents; i++) {
>  		parents[i] = data->parents[i];
>  
> -		ret = __match_string(cprman_parent_names,
> -				     ARRAY_SIZE(cprman_parent_names),
> -				     parents[i]);
> +		ret = match_string(cprman_parent_names, parents[i]);
>  		if (ret >= 0)
>  			parents[i] = cprman->real_parent_names[ret];
>  	}
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index 27d6f04ab58e..71e886869d78 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -279,7 +279,7 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
>  	if (!con_id)
>  		return ERR_PTR(-ENOENT);
>  
> -	i = __match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
> +	i = match_string(whitelist, con_id);
>  	if (i < 0)
>  		return ERR_PTR(-ENOENT);
>  
> diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
> index 286fad1f0e08..6fc4f3d3d1f6 100644
> --- a/drivers/gpu/drm/i915/intel_pipe_crc.c
> +++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
> @@ -449,7 +449,7 @@ display_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *s)
>  		return 0;
>  	}
>  
> -	i = __match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
> +	i = match_string(pipe_crc_sources, buf);
>  	if (i < 0)
>  		return i;
>  
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index 9aaacb5bdb26..53dff34c0afc 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -509,7 +509,7 @@ static int usbhs_omap_get_dt_pdata(struct device *dev,
>  			continue;
>  
>  		/* get 'enum usbhs_omap_port_mode' from port mode string */
> -		ret = __match_string(port_modes, ARRAY_SIZE(port_modes), mode);
> +		ret = match_string(port_modes, mode);
>  		if (ret < 0) {
>  			dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
>  					i, mode);
> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
> index 59ce3ff35553..778b4dfd8b75 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
> @@ -667,7 +667,7 @@ iwl_dbgfs_bt_force_ant_write(struct iwl_mvm *mvm, char *buf,
>  	};
>  	int ret, bt_force_ant_mode;
>  
> -	ret = __match_string(modes_str, ARRAY_SIZE(modes_str), buf);
> +	ret = match_string(modes_str, buf);
>  	if (ret < 0)
>  		return ret;
>  
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 41a0773a1cbc..2278caba109c 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -203,7 +203,7 @@ void pcie_ecrc_get_policy(char *str)
>  {
>  	int i;
>  
> -	i = __match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
> +	i = match_string(ecrc_policy_str, str);
>  	if (i < 0)
>  		return;
>  
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index bca0c404c6ca..5a651d311d38 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -68,7 +68,7 @@ enum usb_device_speed usb_get_maximum_speed(struct device *dev)
>  	if (ret < 0)
>  		return USB_SPEED_UNKNOWN;
>  
> -	ret = __match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
> +	ret = match_string(speed_names, maximum_speed);
>  
>  	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
>  }
> @@ -106,7 +106,7 @@ static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
>  {
>  	int ret;
>  
> -	ret = __match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
> +	ret = match_string(usb_dr_modes, str);
>  	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
>  }
>  
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 4abc5a76ec51..38ac776cba8a 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -1409,8 +1409,7 @@ EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
>   */
>  int typec_find_port_power_role(const char *name)
>  {
> -	return __match_string(typec_port_power_roles,
> -			      ARRAY_SIZE(typec_port_power_roles), name);
> +	return match_string(typec_port_power_roles, name);
>  }
>  EXPORT_SYMBOL_GPL(typec_find_port_power_role);
>  
> @@ -1424,7 +1423,7 @@ EXPORT_SYMBOL_GPL(typec_find_port_power_role);
>   */
>  int typec_find_power_role(const char *name)
>  {
> -	return __match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
> +	return match_string(typec_roles, name);
>  }
>  EXPORT_SYMBOL_GPL(typec_find_power_role);
>  
> @@ -1438,8 +1437,7 @@ EXPORT_SYMBOL_GPL(typec_find_power_role);
>   */
>  int typec_find_port_data_role(const char *name)
>  {
> -	return __match_string(typec_port_data_roles,
> -			      ARRAY_SIZE(typec_port_data_roles), name);
> +	return match_string(typec_port_data_roles, name);
>  }
>  EXPORT_SYMBOL_GPL(typec_find_port_data_role);
>  
> diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
> index 0389e4391faf..0c4e47868590 100644
> --- a/drivers/usb/typec/tps6598x.c
> +++ b/drivers/usb/typec/tps6598x.c
> @@ -423,7 +423,7 @@ static int tps6598x_check_mode(struct tps6598x *tps)
>  	if (ret)
>  		return ret;
>  
> -	switch (__match_string(modes, ARRAY_SIZE(modes), mode)) {
> +	switch (match_string(modes, mode)) {
>  	case TPS_MODE_APP:
>  		return 0;
>  	case TPS_MODE_BOOT:
> diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
> index b31585ecf48f..fe8283d3781b 100644
> --- a/drivers/vfio/vfio.c
> +++ b/drivers/vfio/vfio.c
> @@ -637,9 +637,7 @@ static bool vfio_dev_whitelisted(struct device *dev, struct device_driver *drv)
>  			return true;
>  	}
>  
> -	return __match_string(vfio_driver_whitelist,
> -			      ARRAY_SIZE(vfio_driver_whitelist),
> -			      drv->name) >= 0;
> +	return match_string(vfio_driver_whitelist, drv->name) >= 0;
>  }
>  
>  /*
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 531d04308ff9..07e9f89088df 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -194,6 +194,15 @@ static inline int strtobool(const char *s, bool *res)
>  int __match_string(const char * const *array, size_t n, const char *string);
>  int __sysfs_match_string(const char * const *array, size_t n, const char *s);
>  
> +/**
> + * match_string - matches given string in an array
> + * @_a: array of strings
> + * @_s: string to match with
> + *
> + * Helper for __match_string(). Calculates the size of @a automatically.
> + */
> +#define match_string(_a, _s) __match_string(_a, ARRAY_SIZE(_a), _s)
> +
>  /**
>   * sysfs_match_string - matches given string in an array
>   * @_a: array of strings
> diff --git a/sound/firewire/oxfw/oxfw.c b/sound/firewire/oxfw/oxfw.c
> index 9ec5316f3bb5..433fc84c4f90 100644
> --- a/sound/firewire/oxfw/oxfw.c
> +++ b/sound/firewire/oxfw/oxfw.c
> @@ -57,7 +57,7 @@ static bool detect_loud_models(struct fw_unit *unit)
>  	if (err < 0)
>  		return false;
>  
> -	return __match_string(models, ARRAY_SIZE(models), model) >= 0;
> +	return match_string(models, model) >= 0;
>  }
>  
>  static int name_card(struct snd_oxfw *oxfw)
> diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
> index 3ef743075bda..911ffe84c37e 100644
> --- a/sound/soc/codecs/max98088.c
> +++ b/sound/soc/codecs/max98088.c
> @@ -1405,7 +1405,7 @@ static int max98088_get_channel(struct snd_soc_component *component, const char
>  {
>  	int ret;
>  
> -	ret = __match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
> +	ret = match_string(eq_mode_name, name);
>  	if (ret < 0)
>  		dev_err(component->dev, "Bad EQ channel name '%s'\n", name);
>  	return ret;
> diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
> index cd69916d5dcb..d182d45d0c83 100644
> --- a/sound/soc/codecs/max98095.c
> +++ b/sound/soc/codecs/max98095.c
> @@ -1636,7 +1636,7 @@ static int max98095_get_bq_channel(struct snd_soc_component *component,
>  {
>  	int ret;
>  
> -	ret = __match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
> +	ret = match_string(bq_mode_name, name);
>  	if (ret < 0)
>  		dev_err(component->dev, "Bad biquad channel name '%s'\n", name);
>  	return ret;
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Greg KH]

On Wed, May 08, 2019 at 04:11:28PM +0300, Andy Shevchenko wrote:
> On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean wrote:
> > This change re-introduces `match_string()` as a macro that uses
> > ARRAY_SIZE() to compute the size of the array.
> > The macro is added in all the places that do
> > `match_string(_a, ARRAY_SIZE(_a), s)`, since the change is pretty
> > straightforward.
> 
> Can you split include/linux/ change from the rest?

That would break the build, why do you want it split out?  This makes
sense all as a single patch to me.

thanks,

greg k-h

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Ardelean, Alexandru]

On Wed, 2019-05-08 at 15:18 +0200, Greg KH wrote:
> 
> 
> On Wed, May 08, 2019 at 04:11:28PM +0300, Andy Shevchenko wrote:
> > On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean wrote:
> > > This change re-introduces `match_string()` as a macro that uses
> > > ARRAY_SIZE() to compute the size of the array.
> > > The macro is added in all the places that do
> > > `match_string(_a, ARRAY_SIZE(_a), s)`, since the change is pretty
> > > straightforward.
> > 
> > Can you split include/linux/ change from the rest?
> 
> That would break the build, why do you want it split out?  This makes
> sense all as a single patch to me.
> 

Not really.
It would be just be the new match_string() helper/macro in a new commit.
And the conversions of the simple users of match_string() (the ones using
ARRAY_SIZE()) in another commit.

Thanks
Alex

> thanks,
> 
> greg k-h

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Ardelean, Alexandru]

On Wed, 2019-05-08 at 16:22 +0300, Alexandru Ardelean wrote:
> On Wed, 2019-05-08 at 15:18 +0200, Greg KH wrote:
> > 
> > 
> > On Wed, May 08, 2019 at 04:11:28PM +0300, Andy Shevchenko wrote:
> > > On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean wrote:
> > > > This change re-introduces `match_string()` as a macro that uses
> > > > ARRAY_SIZE() to compute the size of the array.
> > > > The macro is added in all the places that do
> > > > `match_string(_a, ARRAY_SIZE(_a), s)`, since the change is pretty
> > > > straightforward.
> > > 
> > > Can you split include/linux/ change from the rest?
> > 
> > That would break the build, why do you want it split out?  This makes
> > sense all as a single patch to me.
> > 
> 
> Not really.
> It would be just be the new match_string() helper/macro in a new commit.
> And the conversions of the simple users of match_string() (the ones using
> ARRAY_SIZE()) in another commit.
> 

I should have asked in my previous reply.
Leave this as-is or re-formulate in 2 patches ?

No strong preference from my side.

Thanks
Alex

> Thanks
> Alex
> 
> > thanks,
> > 
> > greg k-h

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[andriy.shevchenko]

On Fri, May 10, 2019 at 09:15:27AM +0000, Ardelean, Alexandru wrote:
> On Wed, 2019-05-08 at 16:22 +0300, Alexandru Ardelean wrote:
> > On Wed, 2019-05-08 at 15:18 +0200, Greg KH wrote:
> > > On Wed, May 08, 2019 at 04:11:28PM +0300, Andy Shevchenko wrote:
> > > > On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean wrote:

> > > > Can you split include/linux/ change from the rest?
> > > 
> > > That would break the build, why do you want it split out?  This makes
> > > sense all as a single patch to me.
> > > 
> > 
> > Not really.
> > It would be just be the new match_string() helper/macro in a new commit.
> > And the conversions of the simple users of match_string() (the ones using
> > ARRAY_SIZE()) in another commit.
> > 
> 
> I should have asked in my previous reply.
> Leave this as-is or re-formulate in 2 patches ?

Depends on on what you would like to spend your time: collecting Acks for all
pieces in treewide patch or send new API first followed up by per driver /
module update in next cycle.

I also have no strong preference.
And I think it's good to add Heikki Krogerus to Cc list for both patch series,
since he is the author of sysfs variant and may have something to comment on
the rest.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 03/16] lib,treewide: add new match_string() helper/macro

[Ardelean, Alexandru]

On Fri, 2019-05-10 at 17:34 +0300, andriy.shevchenko@linux.intel.com wrote:
> [External]
> 
> 
> On Fri, May 10, 2019 at 09:15:27AM +0000, Ardelean, Alexandru wrote:
> > On Wed, 2019-05-08 at 16:22 +0300, Alexandru Ardelean wrote:
> > > On Wed, 2019-05-08 at 15:18 +0200, Greg KH wrote:
> > > > On Wed, May 08, 2019 at 04:11:28PM +0300, Andy Shevchenko wrote:
> > > > > On Wed, May 08, 2019 at 02:28:29PM +0300, Alexandru Ardelean
> > > > > wrote:
> > > > > Can you split include/linux/ change from the rest?
> > > > 
> > > > That would break the build, why do you want it split out?  This
> > > > makes
> > > > sense all as a single patch to me.
> > > > 
> > > 
> > > Not really.
> > > It would be just be the new match_string() helper/macro in a new
> > > commit.
> > > And the conversions of the simple users of match_string() (the ones
> > > using
> > > ARRAY_SIZE()) in another commit.
> > > 
> > 
> > I should have asked in my previous reply.
> > Leave this as-is or re-formulate in 2 patches ?
> 
> Depends on on what you would like to spend your time: collecting Acks for
> all
> pieces in treewide patch or send new API first followed up by per driver
> /
> module update in next cycle.

I actually would have preferred new API first, with the current
`match_string()` -> `__match_string()` rename from the start, but I wasn't
sure. I am still navigating through how feedbacks are working in this
realm.

I'll send a V2 with the API change-first/only; should be a smaller list.
Then see about follow-ups/changes per subsystems.

> 
> I also have no strong preference.
> And I think it's good to add Heikki Krogerus to Cc list for both patch
> series,
> since he is the author of sysfs variant and may have something to comment
> on
> the rest.

Thanks for the reference.

> 
> --
> With Best Regards,
> Andy Shevchenko
> 
> 

[PATCH 04/16] powerpc/xmon: use new match_string() helper/macro

[Alexandru Ardelean]

The change is purely cosmetic at this point in time, but it does highlight
the change done in lib/string.c for match_string().

Particularly for this change, if a regname is removed (replaced with NULL)
in the list, the match_string() helper will continue until the end of the
array and ignore the NULL.
This would technically allow for "reserved" regs, though here it's not the
case.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 arch/powerpc/xmon/xmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index efca104ac0cb..b84a7fc1112b 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3231,7 +3231,7 @@ scanhex(unsigned long *vp)
 			regname[i] = c;
 		}
 		regname[i] = 0;
-		i = __match_string(regnames, N_PTREGS, regname);
+		i = match_string(regnames, regname);
 		if (i < 0) {
 			printf("invalid register name '%%%s'\n", regname);
 			return 0;
-- 
2.17.1

[PATCH 05/16] ALSA: oxygen: use new match_string() helper/macro

[Alexandru Ardelean]

The change is purely cosmetic at this point in time, but it does highlight
the change done in lib/string.c for match_string().

Particularly for this change, a control mode can be removed/added at a
different index/enum-value, and the match_string() helper will continue
until the end of the array and ignore the NULL.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 sound/pci/oxygen/oxygen_mixer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index 13c2fb75fd71..961fd1cbc712 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -1086,7 +1086,7 @@ static int add_controls(struct oxygen *chip,
 		err = snd_ctl_add(chip->card, ctl);
 		if (err < 0)
 			return err;
-		j = __match_string(known_ctl_names, CONTROL_COUNT, ctl->id.name);
+		j = match_string(known_ctl_names, ctl->id.name);
 		if (j >= 0) {
 			chip->controls[j] = ctl;
 			ctl->private_free = oxygen_any_ctl_free;
-- 
2.17.1

[PATCH 06/16] x86/mtrr: use new match_string() helper + add gaps == minor fix

[Alexandru Ardelean]

This change is a bit more than cosmetic.

It replaces 2 values in mtrr_strings with NULL. Previously, they were
defined as "?", which is not great because you could technically pass "?",
and you would get value 2.
It's not sure whether that was intended (likely it wasn't), but this fixes
that.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 arch/x86/kernel/cpu/mtrr/if.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 4ec7a5f7b94c..e67820a044cc 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -20,8 +20,8 @@ static const char *const mtrr_strings[MTRR_NUM_TYPES] =
 {
 	"uncachable",		/* 0 */
 	"write-combining",	/* 1 */
-	"?",			/* 2 */
-	"?",			/* 3 */
+	NULL,			/* 2 */
+	NULL,			/* 3 */
 	"write-through",	/* 4 */
 	"write-protect",	/* 5 */
 	"write-back",		/* 6 */
@@ -29,7 +29,9 @@ static const char *const mtrr_strings[MTRR_NUM_TYPES] =
 
 const char *mtrr_attrib_to_str(int x)
 {
-	return (x <= 6) ? mtrr_strings[x] : "?";
+	if ((x >= ARRAY_SIZE(mtrr_strings)) || (mtrr_strings[x] == NULL))
+		return "?";
+	return mtrr_strings[x];
 }
 
 #ifdef CONFIG_PROC_FS
@@ -142,7 +144,7 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
 		return -EINVAL;
 	ptr = skip_spaces(ptr + 5);
 
-	i = __match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
+	i = match_string(mtrr_strings, ptr);
 	if (i < 0)
 		return i;
 
-- 
2.17.1

[PATCH 07/16] device connection: use new match_string() helper/macro

[Alexandru Ardelean]

The `device_connection` struct is defined as:
struct device_connection {
        struct fwnode_handle    *fwnode;
        const char              *endpoint[2];
        const char              *id;
        struct list_head        list;
};

The `endpoint` member is a static array of strings (on the struct), so
using the match_string() (which does an ARRAY_SIZE((con->endpoint)) should
be fine.

The recent change to match_string() (to ignore NULL entries up to the size
of the array) shouldn't affect this.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/base/devcon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 7bc1c619b721..4a2338665585 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -70,7 +70,7 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
 	mutex_lock(&devcon_lock);
 
 	list_for_each_entry(con, &devcon_list, list) {
-		ep = __match_string(con->endpoint, 2, devname);
+		ep = match_string(con->endpoint, devname);
 		if (ep < 0)
 			continue;
 
-- 
2.17.1

[PATCH 08/16] cpufreq/intel_pstate: remove NULL entry + use match_string()

[Alexandru Ardelean]

The change is mostly cosmetic.

The `energy_perf_strings` array is static, so match_string() can be used
(which will implicitly do a ARRAY_SIZE(energy_perf_strings)).

The only small benefit here, is the reduction of the array size by 1
element.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/cpufreq/intel_pstate.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6ed1e705bc05..ab9a0b34b900 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -593,8 +593,7 @@ static const char * const energy_perf_strings[] = {
 	"performance",
 	"balance_performance",
 	"balance_power",
-	"power",
-	NULL
+	"power"
 };
 static const unsigned int epp_values[] = {
 	HWP_EPP_PERFORMANCE,
@@ -680,8 +679,8 @@ static ssize_t show_energy_performance_available_preferences(
 	int i = 0;
 	int ret = 0;
 
-	while (energy_perf_strings[i] != NULL)
-		ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
+	for (; i < ARRAY_SIZE(energy_perf_strings); i++)
+		ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i]);
 
 	ret += sprintf(&buf[ret], "\n");
 
@@ -701,7 +700,7 @@ static ssize_t store_energy_performance_preference(
 	if (ret != 1)
 		return -EINVAL;
 
-	ret = __match_string(energy_perf_strings, -1, str_preference);
+	ret = match_string(energy_perf_strings, str_preference);
 	if (ret < 0)
 		return ret;
 
-- 
2.17.1

[PATCH 09/16] mmc: sdhci-xenon: use new match_string() helper/macro

[Alexandru Ardelean]

The change is also cosmetic, but it also does a tighter coupling between
the enums & the string values. This way, the ARRAY_SIZE(phy_types) that is
implicitly done in the match_string() macro is also a bit safer.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/mmc/host/sdhci-xenon-phy.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index 59b7a6cac995..2a9206867fe1 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -135,17 +135,17 @@ struct xenon_emmc_phy_regs {
 	u32 logic_timing_val;
 };
 
-static const char * const phy_types[] = {
-	"emmc 5.0 phy",
-	"emmc 5.1 phy"
-};
-
 enum xenon_phy_type_enum {
 	EMMC_5_0_PHY,
 	EMMC_5_1_PHY,
 	NR_PHY_TYPES
 };
 
+static const char * const phy_types[NR_PHY_TYPES] = {
+	[EMMC_5_0_PHY] = "emmc 5.0 phy",
+	[EMMC_5_1_PHY] = "emmc 5.1 phy"
+};
+
 enum soc_pad_ctrl_type {
 	SOC_PAD_SD,
 	SOC_PAD_FIXED_1_8V,
@@ -821,7 +821,7 @@ static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	int ret;
 
-	priv->phy_type = __match_string(phy_types, NR_PHY_TYPES, phy_name);
+	priv->phy_type = match_string(phy_types, phy_name);
 	if (priv->phy_type < 0) {
 		dev_err(mmc_dev(host->mmc),
 			"Unable to determine PHY name %s. Use default eMMC 5.1 PHY\n",
-- 
2.17.1

Re: [PATCH 09/16] mmc: sdhci-xenon: use new match_string() helper/macro

[Dan Carpenter]

On Wed, May 08, 2019 at 02:28:35PM +0300, Alexandru Ardelean wrote:
> -static const char * const phy_types[] = {
> -	"emmc 5.0 phy",
> -	"emmc 5.1 phy"
> -};
> -
>  enum xenon_phy_type_enum {
>  	EMMC_5_0_PHY,
>  	EMMC_5_1_PHY,
>  	NR_PHY_TYPES

There is no need for NR_PHY_TYPES now so you could remove that as well.

regards,
dan carpenter

[PATCH 10/16] pinctrl: armada-37xx: use new match_string() helper/macro

[Alexandru Ardelean]

The change is mostly cosmetic.

The `armada_37xx_pin_group` struct is defined as.
struct armada_37xx_pin_group {
        const char      *name;
        unsigned int    start_pin;
        unsigned int    npins;
        u32             reg_mask;
        u32             val[NB_FUNCS];
        unsigned int    extra_pin;
        unsigned int    extra_npins;
        const char      *funcs[NB_FUNCS];
        unsigned int    *pins;
};

The `funcs` field is a static array of strings, so using the
new `match_string()` helper (which does an implicit ARRAY_SIZE(gp->funcs))
should be fine.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
index 07a5bcaa0067..68b0db5ef5e9 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -348,7 +348,7 @@ static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev,
 	dev_dbg(info->dev, "enable function %s group %s\n",
 		name, grp->name);
 
-	func = __match_string(grp->funcs, NB_FUNCS, name);
+	func = match_string(grp->funcs, name);
 	if (func < 0)
 		return -ENOTSUPP;
 
@@ -938,7 +938,7 @@ static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info)
 			struct armada_37xx_pin_group *gp = &info->groups[g];
 			int f;
 
-			f = __match_string(gp->funcs, NB_FUNCS, name);
+			f = match_string(gp->funcs, name);
 			if (f < 0)
 				continue;
 
-- 
2.17.1

[PATCH 11/16] mm/vmpressure.c: use new match_string() helper/macro

[Alexandru Ardelean]

__match_string() is called on 2 static array of strings in this file. For
this reason, the conversion to the new match_string() macro/helper, was
done in this separate commit.

Using the new match_string() helper is mostly a cosmetic change (at this
point in time). The sizes of the arrays will be computed automatically,
which would only help if they ever get expanded.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 mm/vmpressure.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index d43f33139568..b8149924f078 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -378,7 +378,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 
 	/* Find required level */
 	token = strsep(&spec, ",");
-	level = __match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, token);
+	level = match_string(vmpressure_str_levels, token);
 	if (level < 0) {
 		ret = level;
 		goto out;
@@ -387,7 +387,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 	/* Find optional mode */
 	token = strsep(&spec, ",");
 	if (token) {
-		mode = __match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, token);
+		mode = match_string(vmpressure_str_modes, token);
 		if (mode < 0) {
 			ret = mode;
 			goto out;
-- 
2.17.1

[PATCH 12/16] rdmacg: use new match_string() helper/macro

[Alexandru Ardelean]

The `rdmacg_resource_names` array is a static array of strings.
Using match_string() (which computes the array size via ARRAY_SIZE())
is possible.

The change is mostly cosmetic.
No functionality change.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 kernel/cgroup/rdma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/rdma.c b/kernel/cgroup/rdma.c
index 65d4df148603..71c3d305bd1f 100644
--- a/kernel/cgroup/rdma.c
+++ b/kernel/cgroup/rdma.c
@@ -367,7 +367,7 @@ static int parse_resource(char *c, int *intval)
 	if (!name || !value)
 		return -EINVAL;
 
-	i = __match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name);
+	i = match_string(rdmacg_resource_names, name);
 	if (i < 0)
 		return i;
 
-- 
2.17.1

[PATCH 13/16] drm/edid: use new match_string() helper/macro

[Alexandru Ardelean]

The `generic_edid_name` is a static array of strings.
Using match_string() (which computes the array size via ARRAY_SIZE())
is possible.

The change is mostly cosmetic.
No functionality change.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/gpu/drm/drm_edid_load.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 1450051972ea..66e1e325ff37 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -186,7 +186,7 @@ static void *edid_load(struct drm_connector *connector, const char *name,
 	int i, valid_extensions = 0;
 	bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
 
-	builtin = __match_string(generic_edid_name, GENERIC_EDIDS, name);
+	builtin = match_string(generic_edid_name, name);
 	if (builtin >= 0) {
 		fwdata = generic_edid[builtin];
 		fwsize = sizeof(generic_edid[builtin]);
-- 
2.17.1

[PATCH 14/16] staging: gdm724x: use new match_string() helper/macro

[Alexandru Ardelean]

The `DRIVER_STRING` array is a static array of strings.
Using match_string() (which computes the array size via ARRAY_SIZE())
is possible.

The change is mostly cosmetic.
No functionality change.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/staging/gdm724x/gdm_tty.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 6e147a324652..81dd6795599f 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -56,8 +56,7 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 	struct gdm *gdm = NULL;
 	int ret;
 
-	ret = __match_string(DRIVER_STRING, TTY_MAX_COUNT,
-			     tty->driver->driver_name);
+	ret = match_string(DRIVER_STRING, tty->driver->driver_name);
 	if (ret < 0)
 		return -ENODEV;
 
-- 
2.17.1

[PATCH 15/16] video: fbdev: pxafb: use new match_string() helper/macro

[Alexandru Ardelean]

The `lcd_types` array is a static array of strings.
Using match_string() (which computes the array size via ARRAY_SIZE())
is possible.

This reduces the array by 1 element, since the NULL (at the end of the
array) is no longer needed.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/video/fbdev/pxafb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index 0025781e6e1e..e657a04f5b1d 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -2114,7 +2114,7 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
 #if defined(CONFIG_OF)
 static const char * const lcd_types[] = {
 	"unknown", "mono-stn", "mono-dstn", "color-stn", "color-dstn",
-	"color-tft", "smart-panel", NULL
+	"color-tft", "smart-panel"
 };
 
 static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
@@ -2129,7 +2129,7 @@ static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
 	if (ret)
 		s = "color-tft";
 
-	i = __match_string(lcd_types, -1, s);
+	i = match_string(lcd_types, s);
 	if (i < 0) {
 		dev_err(dev, "lcd-type %s is unknown\n", s);
 		return i;
-- 
2.17.1

[PATCH 16/16] sched: debug: use new match_string() helper/macro

[Alexandru Ardelean]

The `sched_feat_names` array is a static array of strings.
Using match_string() (which computes the array size via ARRAY_SIZE())
is possible.

The change is mostly cosmetic.
No functionality change.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 kernel/sched/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index b0efc5fe641e..6d5f370bdfde 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -111,7 +111,7 @@ static int sched_feat_set(char *cmp)
 		cmp += 3;
 	}
 
-	i = __match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
+	i = match_string(sched_feat_names, cmp);
 	if (i < 0)
 		return i;
 
-- 
2.17.1

[PATCH 1/3][V2] lib: fix match_string() helper on -1 array size

[Alexandru Ardelean]

The documentation the `_match_string()` helper mentions that `n`
should be:
 * @n: number of strings in the array or -1 for NULL terminated arrays

The behavior of the function is different, in the sense that it exits on
the first NULL element in the array, regardless of whether `n` is -1 or a
positive number.

This patch changes the behavior, to exit the loop when a NULL element is
found and n == -1. Essentially, this aligns the behavior with the
doc-string.

There are currently many users of `match_string()`, and so, in order to go
through them, the next patches in the series will focus on doing some
cosmetic changes, which are aimed at grouping the users of
`match_string()`.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---

Changelog v1 -> v2:
* split the initial series into just 3 patches that fix the
  `match_string()` helper and start introducing a new version of this
  helper, which computes array-size of static arrays

 lib/string.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/string.c b/lib/string.c
index 6016eb3ac73d..e2cf5acc83bd 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -681,8 +681,11 @@ int match_string(const char * const *array, size_t n, const char *string)
 
 	for (index = 0; index < n; index++) {
 		item = array[index];
-		if (!item)
+		if (!item) {
+			if (n != (size_t)-1)
+				continue;
 			break;
+		}
 		if (!strcmp(item, string))
 			return index;
 	}
-- 
2.20.1

[PATCH 2/3][V2] treewide: rename match_string() -> __match_string()

[Alexandru Ardelean]

This change does a rename of match_string() -> __match_string().

There are a few parts to the intention here (with this change):
1. Align with sysfs_match_string()/__sysfs_match_string()
2. This helps to group users of `match_string()`:
   a. those that use ARRAY_SIZE(_a) to specify the number of elements
   b. those that use -1 to pass a NULL terminated array of strings
   c. special users, which (after eliminating 1 & 2) are not that many

This change is done treewide. Updates to the new match_string() helper will
be done on a per-subsystem basis, as the cadence of each subsystem differs.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 arch/powerpc/xmon/xmon.c                         |  2 +-
 arch/x86/kernel/cpu/mtrr/if.c                    |  2 +-
 drivers/ata/pata_hpt366.c                        |  2 +-
 drivers/ata/pata_hpt37x.c                        |  2 +-
 drivers/base/devcon.c                            |  2 +-
 drivers/base/property.c                          |  2 +-
 drivers/clk/bcm/clk-bcm2835.c                    |  6 +++---
 drivers/clk/rockchip/clk.c                       |  4 ++--
 drivers/cpufreq/intel_pstate.c                   |  2 +-
 drivers/gpio/gpiolib-of.c                        |  2 +-
 drivers/gpu/drm/drm_edid_load.c                  |  2 +-
 drivers/gpu/drm/drm_panel_orientation_quirks.c   |  2 +-
 drivers/gpu/drm/i915/intel_pipe_crc.c            |  2 +-
 drivers/ide/hpt366.c                             |  2 +-
 drivers/mfd/omap-usb-host.c                      |  2 +-
 drivers/mmc/host/sdhci-xenon-phy.c               |  2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c |  2 +-
 drivers/pci/pcie/aer.c                           |  2 +-
 drivers/phy/tegra/xusb.c                         |  4 ++--
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c      |  4 ++--
 drivers/pinctrl/pinmux.c                         |  2 +-
 drivers/power/supply/ab8500_btemp.c              |  2 +-
 drivers/power/supply/ab8500_charger.c            |  2 +-
 drivers/power/supply/ab8500_fg.c                 |  2 +-
 drivers/power/supply/abx500_chargalg.c           |  2 +-
 drivers/power/supply/charger-manager.c           |  4 ++--
 drivers/staging/gdm724x/gdm_tty.c                |  4 ++--
 drivers/usb/common/common.c                      |  4 ++--
 drivers/usb/typec/class.c                        | 10 +++++-----
 drivers/usb/typec/tps6598x.c                     |  2 +-
 drivers/vfio/vfio.c                              |  6 +++---
 drivers/video/fbdev/pxafb.c                      |  2 +-
 fs/ubifs/auth.c                                  |  4 ++--
 include/linux/string.h                           |  2 +-
 kernel/cgroup/rdma.c                             |  2 +-
 kernel/sched/debug.c                             |  2 +-
 kernel/trace/trace.c                             |  2 +-
 lib/string.c                                     |  8 ++++----
 mm/mempolicy.c                                   |  2 +-
 mm/vmpressure.c                                  |  4 ++--
 security/apparmor/lsm.c                          |  4 ++--
 security/integrity/ima/ima_main.c                |  2 +-
 sound/firewire/oxfw/oxfw.c                       |  2 +-
 sound/pci/oxygen/oxygen_mixer.c                  |  2 +-
 sound/soc/codecs/max98088.c                      |  2 +-
 sound/soc/codecs/max98095.c                      |  2 +-
 sound/soc/soc-dapm.c                             |  2 +-
 47 files changed, 67 insertions(+), 67 deletions(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 1b0149b2bb6c..8039759a9e82 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3264,7 +3264,7 @@ scanhex(unsigned long *vp)
 			regname[i] = c;
 		}
 		regname[i] = 0;
-		i = match_string(regnames, N_PTREGS, regname);
+		i = __match_string(regnames, N_PTREGS, regname);
 		if (i < 0) {
 			printf("invalid register name '%%%s'\n", regname);
 			return 0;
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 4d36dcc1cf87..4ec7a5f7b94c 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -142,7 +142,7 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
 		return -EINVAL;
 	ptr = skip_spaces(ptr + 5);
 
-	i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
+	i = __match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
 	if (i < 0)
 		return i;
 
diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c
index 2574d6fbb1ad..a23ec26cc95f 100644
--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -181,7 +181,7 @@ static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr,
 
 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-	i = match_string(list, -1, model_num);
+	i = __match_string(list, -1, model_num);
 	if (i >= 0) {
 		pr_warn("%s is not supported for %s\n", modestr, list[i]);
 		return 1;
diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index fad6c6a87313..ac0499e4ae4b 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -229,7 +229,7 @@ static int hpt_dma_blacklisted(const struct ata_device *dev, char *modestr,
 
 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-	i = match_string(list, -1, model_num);
+	i = __match_string(list, -1, model_num);
 	if (i >= 0) {
 		pr_warn("%s is not supported for %s\n", modestr, list[i]);
 		return 1;
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 04db9ae235e4..7bc1c619b721 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -70,7 +70,7 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
 	mutex_lock(&devcon_lock);
 
 	list_for_each_entry(con, &devcon_list, list) {
-		ep = match_string(con->endpoint, 2, devname);
+		ep = __match_string(con->endpoint, 2, devname);
 		if (ep < 0)
 			continue;
 
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 348b37e64944..67195d6bfdca 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -443,7 +443,7 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode,
 	if (ret < 0)
 		goto out;
 
-	ret = match_string(values, nval, string);
+	ret = __match_string(values, nval, string);
 	if (ret < 0)
 		ret = -ENODATA;
 out:
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 770bb01f523e..91bb94d68798 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1391,9 +1391,9 @@ static struct clk_hw *bcm2835_register_clock(struct bcm2835_cprman *cprman,
 	for (i = 0; i < data->num_mux_parents; i++) {
 		parents[i] = data->parents[i];
 
-		ret = match_string(cprman_parent_names,
-				   ARRAY_SIZE(cprman_parent_names),
-				   parents[i]);
+		ret = __match_string(cprman_parent_names,
+				     ARRAY_SIZE(cprman_parent_names),
+				     parents[i]);
 		if (ret >= 0)
 			parents[i] = cprman->real_parent_names[ret];
 	}
diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index d5fac5a8a3d7..2163bb54a663 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -280,8 +280,8 @@ static struct clk *rockchip_clk_register_frac_branch(
 		struct clk *mux_clk;
 		int ret;
 
-		frac->mux_frac_idx = match_string(child->parent_names,
-						  child->num_parents, name);
+		frac->mux_frac_idx = __match_string(child->parent_names,
+						    child->num_parents, name);
 		frac->mux_ops = &clk_mux_ops;
 		frac->clk_nb.notifier_call = rockchip_clk_frac_notifier_cb;
 
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 34b54df41aaa..a1f79451308c 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -703,7 +703,7 @@ static ssize_t store_energy_performance_preference(
 	if (ret != 1)
 		return -EINVAL;
 
-	ret = match_string(energy_perf_strings, -1, str_preference);
+	ret = __match_string(energy_perf_strings, -1, str_preference);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index aec7bd86ae7e..527be82e1bac 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -278,7 +278,7 @@ static struct gpio_desc *of_find_regulator_gpio(struct device *dev, const char *
 	if (!con_id)
 		return ERR_PTR(-ENOENT);
 
-	i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
+	i = __match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
 	if (i < 0)
 		return ERR_PTR(-ENOENT);
 
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 1e5593575d23..53c55fc8b8c2 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -174,7 +174,7 @@ static void *edid_load(struct drm_connector *connector, const char *name,
 	int i, valid_extensions = 0;
 	bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
 
-	builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
+	builtin = __match_string(generic_edid_name, GENERIC_EDIDS, name);
 	if (builtin >= 0) {
 		fwdata = generic_edid[builtin];
 		fwsize = sizeof(generic_edid[builtin]);
diff --git a/drivers/gpu/drm/drm_panel_orientation_quirks.c b/drivers/gpu/drm/drm_panel_orientation_quirks.c
index 521aff99b08a..063553adb22d 100644
--- a/drivers/gpu/drm/drm_panel_orientation_quirks.c
+++ b/drivers/gpu/drm/drm_panel_orientation_quirks.c
@@ -213,7 +213,7 @@ int drm_get_panel_orientation_quirk(int width, int height)
 		if (!bios_date)
 			continue;
 
-		i = match_string(data->bios_dates, -1, bios_date);
+		i = __match_string(data->bios_dates, -1, bios_date);
 		if (i >= 0)
 			return data->orientation;
 	}
diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index e7c7be4911c1..3e6af7600c25 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -440,7 +440,7 @@ display_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *s)
 		return 0;
 	}
 
-	i = match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
+	i = __match_string(pipe_crc_sources, ARRAY_SIZE(pipe_crc_sources), buf);
 	if (i < 0)
 		return i;
 
diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c
index fd3b5da44619..5e880a1ebcde 100644
--- a/drivers/ide/hpt366.c
+++ b/drivers/ide/hpt366.c
@@ -534,7 +534,7 @@ static const struct hpt_info hpt371n = {
 
 static bool check_in_drive_list(ide_drive_t *drive, const char **list)
 {
-	return match_string(list, -1, (char *)&drive->id[ATA_ID_PROD]) >= 0;
+	return __match_string(list, -1, (char *)&drive->id[ATA_ID_PROD]) >= 0;
 }
 
 static struct hpt_info *hpt3xx_get_info(struct device *dev)
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 800986a79704..9aaacb5bdb26 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -509,7 +509,7 @@ static int usbhs_omap_get_dt_pdata(struct device *dev,
 			continue;
 
 		/* get 'enum usbhs_omap_port_mode' from port mode string */
-		ret = match_string(port_modes, ARRAY_SIZE(port_modes), mode);
+		ret = __match_string(port_modes, ARRAY_SIZE(port_modes), mode);
 		if (ret < 0) {
 			dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
 					i, mode);
diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index 8d07ee1b8f08..59b7a6cac995 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -821,7 +821,7 @@ static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	int ret;
 
-	priv->phy_type = match_string(phy_types, NR_PHY_TYPES, phy_name);
+	priv->phy_type = __match_string(phy_types, NR_PHY_TYPES, phy_name);
 	if (priv->phy_type < 0) {
 		dev_err(mmc_dev(host->mmc),
 			"Unable to determine PHY name %s. Use default eMMC 5.1 PHY\n",
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index d4ff6b44de2c..969f09a56ba7 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -667,7 +667,7 @@ iwl_dbgfs_bt_force_ant_write(struct iwl_mvm *mvm, char *buf,
 	};
 	int ret, bt_force_ant_mode;
 
-	ret = match_string(modes_str, ARRAY_SIZE(modes_str), buf);
+	ret = __match_string(modes_str, ARRAY_SIZE(modes_str), buf);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index b45bc47d04fe..02f54802fca0 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -206,7 +206,7 @@ void pcie_ecrc_get_policy(char *str)
 {
 	int i;
 
-	i = match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
+	i = __match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
 	if (i < 0)
 		return;
 
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 0417213ed68b..060ba6a0a031 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -119,7 +119,7 @@ int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
 	if (err < 0)
 		return err;
 
-	err = match_string(lane->soc->funcs, lane->soc->num_funcs, function);
+	err = __match_string(lane->soc->funcs, lane->soc->num_funcs, function);
 	if (err < 0) {
 		dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n",
 			function, np);
@@ -568,7 +568,7 @@ static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 	usb2->internal = of_property_read_bool(np, "nvidia,internal");
 
 	if (!of_property_read_string(np, "mode", &mode)) {
-		int err = match_string(modes, ARRAY_SIZE(modes), mode);
+		int err = __match_string(modes, ARRAY_SIZE(modes), mode);
 		if (err < 0) {
 			dev_err(&port->dev, "invalid value %s for \"mode\"\n",
 				mode);
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
index 6462d3ca7ceb..07a5bcaa0067 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -348,7 +348,7 @@ static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev,
 	dev_dbg(info->dev, "enable function %s group %s\n",
 		name, grp->name);
 
-	func = match_string(grp->funcs, NB_FUNCS, name);
+	func = __match_string(grp->funcs, NB_FUNCS, name);
 	if (func < 0)
 		return -ENOTSUPP;
 
@@ -938,7 +938,7 @@ static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info)
 			struct armada_37xx_pin_group *gp = &info->groups[g];
 			int f;
 
-			f = match_string(gp->funcs, NB_FUNCS, name);
+			f = __match_string(gp->funcs, NB_FUNCS, name);
 			if (f < 0)
 				continue;
 
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 4d0cc1889dd9..041326d0ab7b 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -348,7 +348,7 @@ int pinmux_map_to_setting(const struct pinctrl_map *map,
 	}
 	if (map->data.mux.group) {
 		group = map->data.mux.group;
-		ret = match_string(groups, num_groups, group);
+		ret = __match_string(groups, num_groups, group);
 		if (ret < 0) {
 			dev_err(pctldev->dev,
 				"invalid group \"%s\" for function \"%s\"\n",
diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 708fd58cd62b..1cf3b43a41e4 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -858,7 +858,7 @@ static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
 	 * For all psy where the name of your driver
 	 * appears in any supplied_to
 	 */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index 98b335042ba6..8094f38e4085 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -1876,7 +1876,7 @@ static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
 	di = to_ab8500_charger_usb_device_info(usb_chg);
 
 	/* For all psy where the driver name appears in any supplied_to */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 776102c31305..408339c5a4a8 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2174,7 +2174,7 @@ static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
 	 * For all psy where the name of your driver
 	 * appears in any supplied_to
 	 */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/abx500_chargalg.c b/drivers/power/supply/abx500_chargalg.c
index 947709cdd14e..b2fcd0ba379d 100644
--- a/drivers/power/supply/abx500_chargalg.c
+++ b/drivers/power/supply/abx500_chargalg.c
@@ -946,7 +946,7 @@ static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
 	psy = (struct power_supply *)data;
 	di = power_supply_get_drvdata(psy);
 	/* For all psy where the driver name appears in any supplied_to */
-	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
+	j = __match_string(supplicants, ext->num_supplicants, psy->desc->name);
 	if (j < 0)
 		return 0;
 
diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c
index a6900aa0d2ed..70e758e4f4f4 100644
--- a/drivers/power/supply/charger-manager.c
+++ b/drivers/power/supply/charger-manager.c
@@ -2022,8 +2022,8 @@ void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
 
 	mutex_lock(&cm_list_mtx);
 	list_for_each_entry(cm, &cm_list, entry) {
-		if (match_string(cm->desc->psy_charger_stat, -1,
-				 psy->desc->name) >= 0) {
+		if (__match_string(cm->desc->psy_charger_stat, -1,
+				   psy->desc->name) >= 0) {
 			found_power_supply = true;
 			break;
 		}
diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 6e813693a766..6e147a324652 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -56,8 +56,8 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 	struct gdm *gdm = NULL;
 	int ret;
 
-	ret = match_string(DRIVER_STRING, TTY_MAX_COUNT,
-			   tty->driver->driver_name);
+	ret = __match_string(DRIVER_STRING, TTY_MAX_COUNT,
+			     tty->driver->driver_name);
 	if (ret < 0)
 		return -ENODEV;
 
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 18f5dcf58b0d..97f87d758e8a 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -84,7 +84,7 @@ enum usb_device_speed usb_get_maximum_speed(struct device *dev)
 	if (ret < 0)
 		return USB_SPEED_UNKNOWN;
 
-	ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
+	ret = __match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
 
 	return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
 }
@@ -122,7 +122,7 @@ static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
 {
 	int ret;
 
-	ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
+	ret = __match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
 	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
 }
 
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 2eb623841847..4abc5a76ec51 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1409,8 +1409,8 @@ EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
  */
 int typec_find_port_power_role(const char *name)
 {
-	return match_string(typec_port_power_roles,
-			    ARRAY_SIZE(typec_port_power_roles), name);
+	return __match_string(typec_port_power_roles,
+			      ARRAY_SIZE(typec_port_power_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_power_role);
 
@@ -1424,7 +1424,7 @@ EXPORT_SYMBOL_GPL(typec_find_port_power_role);
  */
 int typec_find_power_role(const char *name)
 {
-	return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
+	return __match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_power_role);
 
@@ -1438,8 +1438,8 @@ EXPORT_SYMBOL_GPL(typec_find_power_role);
  */
 int typec_find_port_data_role(const char *name)
 {
-	return match_string(typec_port_data_roles,
-			    ARRAY_SIZE(typec_port_data_roles), name);
+	return __match_string(typec_port_data_roles,
+			      ARRAY_SIZE(typec_port_data_roles), name);
 }
 EXPORT_SYMBOL_GPL(typec_find_port_data_role);
 
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index c674abe3cf99..0389e4391faf 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -423,7 +423,7 @@ static int tps6598x_check_mode(struct tps6598x *tps)
 	if (ret)
 		return ret;
 
-	switch (match_string(modes, ARRAY_SIZE(modes), mode)) {
+	switch (__match_string(modes, ARRAY_SIZE(modes), mode)) {
 	case TPS_MODE_APP:
 		return 0;
 	case TPS_MODE_BOOT:
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 82fcf07fa9ea..01c7bb7316fb 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -638,9 +638,9 @@ static bool vfio_dev_whitelisted(struct device *dev, struct device_driver *drv)
 			return true;
 	}
 
-	return match_string(vfio_driver_whitelist,
-			    ARRAY_SIZE(vfio_driver_whitelist),
-			    drv->name) >= 0;
+	return __match_string(vfio_driver_whitelist,
+			      ARRAY_SIZE(vfio_driver_whitelist),
+			      drv->name) >= 0;
 }
 
 /*
diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index d59c8a59f582..0025781e6e1e 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -2129,7 +2129,7 @@ static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
 	if (ret)
 		s = "color-tft";
 
-	i = match_string(lcd_types, -1, s);
+	i = __match_string(lcd_types, -1, s);
 	if (i < 0) {
 		dev_err(dev, "lcd-type %s is unknown\n", s);
 		return i;
diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index 60f43b93d06e..076feb5a9cb6 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -216,8 +216,8 @@ int ubifs_init_authentication(struct ubifs_info *c)
 		return -EINVAL;
 	}
 
-	c->auth_hash_algo = match_string(hash_algo_name, HASH_ALGO__LAST,
-					 c->auth_hash_name);
+	c->auth_hash_algo = __match_string(hash_algo_name, HASH_ALGO__LAST,
+					   c->auth_hash_name);
 	if ((int)c->auth_hash_algo < 0) {
 		ubifs_err(c, "Unknown hash algo %s specified",
 			  c->auth_hash_name);
diff --git a/include/linux/string.h b/include/linux/string.h
index 4deb11f7976b..7149fcdf62df 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -195,7 +195,7 @@ static inline int strtobool(const char *s, bool *res)
 	return kstrtobool(s, res);
 }
 
-int match_string(const char * const *array, size_t n, const char *string);
+int __match_string(const char * const *array, size_t n, const char *string);
 int __sysfs_match_string(const char * const *array, size_t n, const char *s);
 
 /**
diff --git a/kernel/cgroup/rdma.c b/kernel/cgroup/rdma.c
index 1d75ae7f1cb7..65d4df148603 100644
--- a/kernel/cgroup/rdma.c
+++ b/kernel/cgroup/rdma.c
@@ -367,7 +367,7 @@ static int parse_resource(char *c, int *intval)
 	if (!name || !value)
 		return -EINVAL;
 
-	i = match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name);
+	i = __match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name);
 	if (i < 0)
 		return i;
 
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 678bfb9bd87f..ef89323c1541 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -111,7 +111,7 @@ static int sched_feat_set(char *cmp)
 		cmp += 3;
 	}
 
-	i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
+	i = __match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
 	if (i < 0)
 		return i;
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1c80521fd436..a818c6145d94 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4625,7 +4625,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
 
 	mutex_lock(&trace_types_lock);
 
-	ret = match_string(trace_options, -1, cmp);
+	ret = __match_string(trace_options, -1, cmp);
 	/* If no option could be set, test the specific tracer options */
 	if (ret < 0)
 		ret = set_tracer_option(tr, cmp, neg);
diff --git a/lib/string.c b/lib/string.c
index e2cf5acc83bd..1797cf31760c 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -666,7 +666,7 @@ bool sysfs_streq(const char *s1, const char *s2)
 EXPORT_SYMBOL(sysfs_streq);
 
 /**
- * match_string - matches given string in an array
+ * __match_string - matches given string in an array
  * @array:	array of strings
  * @n:		number of strings in the array or -1 for NULL terminated arrays
  * @string:	string to match with
@@ -674,7 +674,7 @@ EXPORT_SYMBOL(sysfs_streq);
  * Return:
  * index of a @string in the @array if matches, or %-EINVAL otherwise.
  */
-int match_string(const char * const *array, size_t n, const char *string)
+int __match_string(const char * const *array, size_t n, const char *string)
 {
 	int index;
 	const char *item;
@@ -692,7 +692,7 @@ int match_string(const char * const *array, size_t n, const char *string)
 
 	return -EINVAL;
 }
-EXPORT_SYMBOL(match_string);
+EXPORT_SYMBOL(__match_string);
 
 /**
  * __sysfs_match_string - matches given string in an array
@@ -700,7 +700,7 @@ EXPORT_SYMBOL(match_string);
  * @n: number of strings in the array or -1 for NULL terminated arrays
  * @str: string to match with
  *
- * Returns index of @str in the @array or -EINVAL, just like match_string().
+ * Returns index of @str in the @array or -EINVAL, just like __match_string().
  * Uses sysfs_streq instead of strcmp for matching.
  */
 int __sysfs_match_string(const char * const *array, size_t n, const char *str)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2219e747df49..97bcf4658317 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2755,7 +2755,7 @@ int mpol_parse_str(char *str, struct mempolicy **mpol)
 	if (flags)
 		*flags++ = '\0';	/* terminate mode string */
 
-	mode = match_string(policy_modes, MPOL_MAX, str);
+	mode = __match_string(policy_modes, MPOL_MAX, str);
 	if (mode < 0)
 		goto out;
 
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 4854584ec436..d43f33139568 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -378,7 +378,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 
 	/* Find required level */
 	token = strsep(&spec, ",");
-	level = match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, token);
+	level = __match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, token);
 	if (level < 0) {
 		ret = level;
 		goto out;
@@ -387,7 +387,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
 	/* Find optional mode */
 	token = strsep(&spec, ",");
 	if (token) {
-		mode = match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, token);
+		mode = __match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, token);
 		if (mode < 0) {
 			ret = mode;
 			goto out;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 87500bde5a92..45d28db85e5a 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1480,7 +1480,7 @@ static int param_set_audit(const char *val, const struct kernel_param *kp)
 	if (apparmor_initialized && !policy_admin_capable(NULL))
 		return -EPERM;
 
-	i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
+	i = __match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
 	if (i < 0)
 		return -EINVAL;
 
@@ -1509,7 +1509,7 @@ static int param_set_mode(const char *val, const struct kernel_param *kp)
 	if (apparmor_initialized && !policy_admin_capable(NULL))
 		return -EPERM;
 
-	i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
+	i = __match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
 			 val);
 	if (i < 0)
 		return -EINVAL;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 357edd140c09..618842f85f2d 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -61,7 +61,7 @@ static int __init hash_setup(char *str)
 		goto out;
 	}
 
-	i = match_string(hash_algo_name, HASH_ALGO__LAST, str);
+	i = __match_string(hash_algo_name, HASH_ALGO__LAST, str);
 	if (i < 0)
 		return 1;
 
diff --git a/sound/firewire/oxfw/oxfw.c b/sound/firewire/oxfw/oxfw.c
index 3d27f3378d5d..9ec5316f3bb5 100644
--- a/sound/firewire/oxfw/oxfw.c
+++ b/sound/firewire/oxfw/oxfw.c
@@ -57,7 +57,7 @@ static bool detect_loud_models(struct fw_unit *unit)
 	if (err < 0)
 		return false;
 
-	return match_string(models, ARRAY_SIZE(models), model) >= 0;
+	return __match_string(models, ARRAY_SIZE(models), model) >= 0;
 }
 
 static int name_card(struct snd_oxfw *oxfw)
diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index 81af21ac1439..13c2fb75fd71 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -1086,7 +1086,7 @@ static int add_controls(struct oxygen *chip,
 		err = snd_ctl_add(chip->card, ctl);
 		if (err < 0)
 			return err;
-		j = match_string(known_ctl_names, CONTROL_COUNT, ctl->id.name);
+		j = __match_string(known_ctl_names, CONTROL_COUNT, ctl->id.name);
 		if (j >= 0) {
 			chip->controls[j] = ctl;
 			ctl->private_free = oxygen_any_ctl_free;
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index ca172a4b6849..3ef743075bda 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -1405,7 +1405,7 @@ static int max98088_get_channel(struct snd_soc_component *component, const char
 {
 	int ret;
 
-	ret = match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
+	ret = __match_string(eq_mode_name, ARRAY_SIZE(eq_mode_name), name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad EQ channel name '%s'\n", name);
 	return ret;
diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index 3b3a10da7f40..cd69916d5dcb 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -1636,7 +1636,7 @@ static int max98095_get_bq_channel(struct snd_soc_component *component,
 {
 	int ret;
 
-	ret = match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
+	ret = __match_string(bq_mode_name, ARRAY_SIZE(bq_mode_name), name);
 	if (ret < 0)
 		dev_err(component->dev, "Bad biquad channel name '%s'\n", name);
 	return ret;
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 81a7a12196ff..33ccea0518b1 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -753,7 +753,7 @@ static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
 		item = 0;
 	}
 
-	i = match_string(e->texts, e->items, control_name);
+	i = __match_string(e->texts, e->items, control_name);
 	if (i < 0)
 		return -ENODEV;
 
-- 
2.20.1

[PATCH 3/3][V2] lib: re-introduce new match_string() helper/macro

[Alexandru Ardelean]

This change re-introduces `match_string()` as a macro that uses
ARRAY_SIZE() to compute the size of the array.

After this change, work can start on migrating subsystems to use this new
helper. Since the original helper is pretty used, migrating to this new one
will take a while, and will be reviewed by each subsystem.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 include/linux/string.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index 7149fcdf62df..34491b075449 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -198,6 +198,15 @@ static inline int strtobool(const char *s, bool *res)
 int __match_string(const char * const *array, size_t n, const char *string);
 int __sysfs_match_string(const char * const *array, size_t n, const char *s);
 
+/**
+ * match_string - matches given string in an array
+ * @_a: array of strings
+ * @_s: string to match with
+ *
+ * Helper for __match_string(). Calculates the size of @a automatically.
+ */
+#define match_string(_a, _s) __match_string(_a, ARRAY_SIZE(_a), _s)
+
 /**
  * sysfs_match_string - matches given string in an array
  * @_a: array of strings
-- 
2.20.1