* [PATCH v4 0/3] devres: provide and use devm_krealloc()
@ 2020-07-13 14:59 Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-07-13 14:59 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, Andy Shevchenko
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Regular krealloc() obviously can't work with managed memory. This series
implements devm_krealloc() and adds the first users with hope that this
helper will be adopted by other drivers currently using non-managed
krealloc().
Some additional changes to the code modified by main patches are included.
v1 -> v2:
- remove leftover call to hwmon_device_unregister() from pmbus_core.c
- add a patch extending devm_kmalloc() to handle zero size case
- use WARN_ON() instead of WARN_ONCE() in devm_krealloc() when passed
a pointer to non-managed memory
- correctly handle the case when devm_krealloc() is passed a pointer to
memory in .rodata (potentially returned by devm_kstrdup_const())
- correctly handle ZERO_SIZE_PTR passed as the ptr argument in devm_krealloc()
v2 -> v3:
- drop already applied patches
- collect Acks
- add an additional user in iio
v3 -> v4:
- add the kerneldoc for devm_krealloc()
- WARN() outside of spinlock
- rename local variable
Bartosz Golaszewski (3):
devres: provide devm_krealloc()
hwmon: pmbus: use more devres helpers
iio: adc: xilinx-xadc: use devm_krealloc()
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 67 +++++++++++++++++++
drivers/hwmon/pmbus/pmbus_core.c | 28 +++-----
drivers/iio/adc/xilinx-xadc-core.c | 16 ++---
include/linux/device.h | 2 +
5 files changed, 87 insertions(+), 27 deletions(-)
--
2.26.1
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v4 1/3] devres: provide devm_krealloc()
2020-07-13 14:59 [PATCH v4 0/3] devres: provide and use devm_krealloc() Bartosz Golaszewski
@ 2020-07-13 14:59 ` Bartosz Golaszewski
2020-07-13 19:29 ` Andy Shevchenko
2020-07-13 14:59 ` [PATCH v4 2/3] hwmon: pmbus: use more devres helpers Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 3/3] iio: adc: xilinx-xadc: use devm_krealloc() Bartosz Golaszewski
2 siblings, 1 reply; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-07-13 14:59 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, Andy Shevchenko
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Implement the managed variant of krealloc(). This function works with
all memory allocated by devm_kmalloc() (or devres functions using it
implicitly like devm_kmemdup(), devm_kstrdup() etc.).
Managed realloc'ed chunks can be manually released with devm_kfree().
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/devres.c | 67 +++++++++++++++++++
include/linux/device.h | 2 +
3 files changed, 70 insertions(+)
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index eaaaafc21134f..f318a5c0033c1 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -354,6 +354,7 @@ MEM
devm_kmalloc()
devm_kmalloc_array()
devm_kmemdup()
+ devm_krealloc()
devm_kstrdup()
devm_kvasprintf()
devm_kzalloc()
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index ed615d3b9cf15..1775d35462300 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -837,6 +837,73 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(devm_kmalloc);
+/**
+ * devm_krealloc - Resource-managed krealloc()
+ * @dev: Device to re-allocate memory for
+ * @ptr: Pointer to the memory chunk to re-allocate
+ * @new_size: New allocation size
+ * @gfp: Allocation gfp flags
+ *
+ * Managed krealloc(). Resizes the memory chunk allocated with devm_kmalloc().
+ * Behaves similarly to regular krealloc(): if @ptr is NULL or ZERO_SIZE_PTR,
+ * it's the equivalent of devm_kmalloc(). If new_size is zero, it returns
+ * ZERO_SIZE_PTR. This function doesn't change the order in which the release
+ * callback for the re-alloc'ed devres will be called (except when falling back
+ * to devm_kmalloc()). The contents of the memory are preserved up to the
+ * lesser of new and old sizes.
+ */
+void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
+{
+ struct devres *old_dr, *new_dr;
+ struct list_head old_head;
+ unsigned long flags;
+ size_t total_size;
+ void *ret = NULL;
+
+ if (unlikely(!new_size)) {
+ devm_kfree(dev, ptr);
+ return ZERO_SIZE_PTR;
+ }
+
+ if (unlikely(ZERO_OR_NULL_PTR(ptr)))
+ return devm_kmalloc(dev, new_size, gfp);
+
+ if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
+ /*
+ * We cannot reliably realloc a const string returned by
+ * devm_kstrdup_const().
+ */
+ return NULL;
+
+ if (!check_dr_size(new_size, &total_size))
+ return NULL;
+
+ spin_lock_irqsave(&dev->devres_lock, flags);
+
+ old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
+ if (!old_dr) {
+ spin_unlock_irqrestore(&dev->devres_lock, flags);
+ WARN(1, "Memory chunk not managed or managed by a different device.");
+ return NULL;
+ }
+
+ old_head = old_dr->node.entry;
+
+ new_dr = krealloc(old_dr, total_size, gfp);
+ if (!new_dr) {
+ spin_unlock_irqrestore(&dev->devres_lock, flags);
+ return NULL;
+ }
+
+ if (new_dr != old_dr)
+ list_replace(&old_head, &new_dr->node.entry);
+
+ ret = new_dr->data;
+ spin_unlock_irqrestore(&dev->devres_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_krealloc);
+
/**
* devm_kstrdup - Allocate resource managed space and
* copy an existing string into that.
diff --git a/include/linux/device.h b/include/linux/device.h
index 7322c51e9c0c7..f64f408431593 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id);
/* managed devm_k.alloc/kfree for device drivers */
void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
+void *devm_krealloc(struct device *dev, void *ptr, size_t size,
+ gfp_t gfp) __must_check;
__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
const char *fmt, va_list ap) __malloc;
__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
--
2.26.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v4 2/3] hwmon: pmbus: use more devres helpers
2020-07-13 14:59 [PATCH v4 0/3] devres: provide and use devm_krealloc() Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
@ 2020-07-13 14:59 ` Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 3/3] iio: adc: xilinx-xadc: use devm_krealloc() Bartosz Golaszewski
2 siblings, 0 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-07-13 14:59 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, Andy Shevchenko
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Shrink pmbus code by using devm_hwmon_device_register_with_groups()
and devm_krealloc() instead of their non-managed variants.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/pmbus/pmbus_core.c | 28 +++++++++-------------------
1 file changed, 9 insertions(+), 19 deletions(-)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 44535add3a4a1..91839979cf6c1 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1018,9 +1018,9 @@ static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
{
if (data->num_attributes >= data->max_attributes - 1) {
int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
- void *new_attrs = krealloc(data->group.attrs,
- new_max_attrs * sizeof(void *),
- GFP_KERNEL);
+ void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
+ new_max_attrs * sizeof(void *),
+ GFP_KERNEL);
if (!new_attrs)
return -ENOMEM;
data->group.attrs = new_attrs;
@@ -2534,7 +2534,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
ret = pmbus_find_attributes(client, data);
if (ret)
- goto out_kfree;
+ return ret;
/*
* If there are no attributes, something is wrong.
@@ -2542,35 +2542,27 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
*/
if (!data->num_attributes) {
dev_err(dev, "No attributes found\n");
- ret = -ENODEV;
- goto out_kfree;
+ return -ENODEV;
}
data->groups[0] = &data->group;
memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
- data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
- data, data->groups);
+ data->hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+ client->name, data, data->groups);
if (IS_ERR(data->hwmon_dev)) {
- ret = PTR_ERR(data->hwmon_dev);
dev_err(dev, "Failed to register hwmon device\n");
- goto out_kfree;
+ return PTR_ERR(data->hwmon_dev);
}
ret = pmbus_regulator_register(data);
if (ret)
- goto out_unregister;
+ return ret;
ret = pmbus_init_debugfs(client, data);
if (ret)
dev_warn(dev, "Failed to register debugfs\n");
return 0;
-
-out_unregister:
- hwmon_device_unregister(data->hwmon_dev);
-out_kfree:
- kfree(data->group.attrs);
- return ret;
}
EXPORT_SYMBOL_GPL(pmbus_do_probe);
@@ -2580,8 +2572,6 @@ int pmbus_do_remove(struct i2c_client *client)
debugfs_remove_recursive(data->debugfs);
- hwmon_device_unregister(data->hwmon_dev);
- kfree(data->group.attrs);
return 0;
}
EXPORT_SYMBOL_GPL(pmbus_do_remove);
--
2.26.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v4 3/3] iio: adc: xilinx-xadc: use devm_krealloc()
2020-07-13 14:59 [PATCH v4 0/3] devres: provide and use devm_krealloc() Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 2/3] hwmon: pmbus: use more devres helpers Bartosz Golaszewski
@ 2020-07-13 14:59 ` Bartosz Golaszewski
2 siblings, 0 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-07-13 14:59 UTC (permalink / raw)
To: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, Andy Shevchenko
Cc: linux-iio, linux-arm-kernel, linux-kernel, Bartosz Golaszewski
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Use the managed variant of krealloc() and shrink the code a bit.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/iio/adc/xilinx-xadc-core.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index d7fecab9252e4..5bdbe502e983a 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1094,6 +1094,7 @@ MODULE_DEVICE_TABLE(of, xadc_of_match_table);
static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
unsigned int *conf)
{
+ struct device *dev = indio_dev->dev.parent;
struct xadc *xadc = iio_priv(indio_dev);
struct iio_chan_spec *channels, *chan;
struct device_node *chan_node, *child;
@@ -1138,7 +1139,8 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
*conf |= XADC_CONF0_MUX | XADC_CONF0_CHAN(ext_mux_chan);
}
- channels = kmemdup(xadc_channels, sizeof(xadc_channels), GFP_KERNEL);
+ channels = devm_kmemdup(dev, xadc_channels,
+ sizeof(xadc_channels), GFP_KERNEL);
if (!channels)
return -ENOMEM;
@@ -1174,8 +1176,9 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
of_node_put(chan_node);
indio_dev->num_channels = num_channels;
- indio_dev->channels = krealloc(channels, sizeof(*channels) *
- num_channels, GFP_KERNEL);
+ indio_dev->channels = devm_krealloc(dev, channels,
+ sizeof(*channels) * num_channels,
+ GFP_KERNEL);
/* If we can't resize the channels array, just use the original */
if (!indio_dev->channels)
indio_dev->channels = channels;
@@ -1229,14 +1232,14 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_parse_dt(indio_dev, pdev->dev.of_node, &conf0);
if (ret)
- goto err_device_free;
+ return ret;
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time, &xadc_trigger_handler,
&xadc_buffer_ops);
if (ret)
- goto err_device_free;
+ return ret;
xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
if (IS_ERR(xadc->convst_trigger)) {
@@ -1354,8 +1357,6 @@ static int xadc_probe(struct platform_device *pdev)
err_triggered_buffer_cleanup:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_triggered_buffer_cleanup(indio_dev);
-err_device_free:
- kfree(indio_dev->channels);
return ret;
}
@@ -1375,7 +1376,6 @@ static int xadc_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
clk_disable_unprepare(xadc->clk);
kfree(xadc->data);
- kfree(indio_dev->channels);
return 0;
}
--
2.26.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v4 1/3] devres: provide devm_krealloc()
2020-07-13 14:59 ` [PATCH v4 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
@ 2020-07-13 19:29 ` Andy Shevchenko
2020-07-14 14:48 ` Bartosz Golaszewski
0 siblings, 1 reply; 6+ messages in thread
From: Andy Shevchenko @ 2020-07-13 19:29 UTC (permalink / raw)
To: Bartosz Golaszewski
Cc: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, linux-iio, linux-arm-kernel, linux-kernel,
Bartosz Golaszewski
On Mon, Jul 13, 2020 at 04:59:32PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Implement the managed variant of krealloc(). This function works with
> all memory allocated by devm_kmalloc() (or devres functions using it
> implicitly like devm_kmemdup(), devm_kstrdup() etc.).
>
> Managed realloc'ed chunks can be manually released with devm_kfree().
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
> .../driver-api/driver-model/devres.rst | 1 +
> drivers/base/devres.c | 67 +++++++++++++++++++
> include/linux/device.h | 2 +
> 3 files changed, 70 insertions(+)
>
> diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
> index eaaaafc21134f..f318a5c0033c1 100644
> --- a/Documentation/driver-api/driver-model/devres.rst
> +++ b/Documentation/driver-api/driver-model/devres.rst
> @@ -354,6 +354,7 @@ MEM
> devm_kmalloc()
> devm_kmalloc_array()
> devm_kmemdup()
> + devm_krealloc()
> devm_kstrdup()
> devm_kvasprintf()
> devm_kzalloc()
> diff --git a/drivers/base/devres.c b/drivers/base/devres.c
> index ed615d3b9cf15..1775d35462300 100644
> --- a/drivers/base/devres.c
> +++ b/drivers/base/devres.c
> @@ -837,6 +837,73 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
> }
> EXPORT_SYMBOL_GPL(devm_kmalloc);
>
> +/**
> + * devm_krealloc - Resource-managed krealloc()
> + * @dev: Device to re-allocate memory for
> + * @ptr: Pointer to the memory chunk to re-allocate
> + * @new_size: New allocation size
> + * @gfp: Allocation gfp flags
> + *
> + * Managed krealloc(). Resizes the memory chunk allocated with devm_kmalloc().
> + * Behaves similarly to regular krealloc(): if @ptr is NULL or ZERO_SIZE_PTR,
> + * it's the equivalent of devm_kmalloc(). If new_size is zero, it returns
'it frees the previously allocated memory and returns'
> + * ZERO_SIZE_PTR. This function doesn't change the order in which the release
> + * callback for the re-alloc'ed devres will be called (except when falling back
> + * to devm_kmalloc()
'or when freeing resources when new_size is zero'
> ). The contents of the memory are preserved up to the
> + * lesser of new and old sizes.
> + */
> +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
> +{
> + struct devres *old_dr, *new_dr;
> + struct list_head old_head;
> + unsigned long flags;
> + size_t total_size;
> + void *ret = NULL;
> +
> + if (unlikely(!new_size)) {
> + devm_kfree(dev, ptr);
> + return ZERO_SIZE_PTR;
> + }
> +
> + if (unlikely(ZERO_OR_NULL_PTR(ptr)))
> + return devm_kmalloc(dev, new_size, gfp);
> +
> + if (WARN_ON(is_kernel_rodata((unsigned long)ptr)))
> + /*
> + * We cannot reliably realloc a const string returned by
> + * devm_kstrdup_const().
> + */
> + return NULL;
> +
> + if (!check_dr_size(new_size, &total_size))
> + return NULL;
> +
> + spin_lock_irqsave(&dev->devres_lock, flags);
> +
> + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr);
> + if (!old_dr) {
> + spin_unlock_irqrestore(&dev->devres_lock, flags);
> + WARN(1, "Memory chunk not managed or managed by a different device.");
> + return NULL;
> + }
> +
> + old_head = old_dr->node.entry;
> +
> + new_dr = krealloc(old_dr, total_size, gfp);
> + if (!new_dr) {
> + spin_unlock_irqrestore(&dev->devres_lock, flags);
> + return NULL;
> + }
> +
> + if (new_dr != old_dr)
> + list_replace(&old_head, &new_dr->node.entry);
> +
> + ret = new_dr->data;
> + spin_unlock_irqrestore(&dev->devres_lock, flags);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(devm_krealloc);
> +
> /**
> * devm_kstrdup - Allocate resource managed space and
> * copy an existing string into that.
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 7322c51e9c0c7..f64f408431593 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id);
>
> /* managed devm_k.alloc/kfree for device drivers */
> void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
> +void *devm_krealloc(struct device *dev, void *ptr, size_t size,
> + gfp_t gfp) __must_check;
Strange indentation, also you can move __must_check to the beginning of the
declaration.
> __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
> const char *fmt, va_list ap) __malloc;
> __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
> --
> 2.26.1
>
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v4 1/3] devres: provide devm_krealloc()
2020-07-13 19:29 ` Andy Shevchenko
@ 2020-07-14 14:48 ` Bartosz Golaszewski
0 siblings, 0 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-07-14 14:48 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Michal Simek, Greg Kroah-Hartman,
Guenter Roeck, linux-iio, Linux ARM, Linux Kernel Mailing List,
Bartosz Golaszewski
On Mon, Jul 13, 2020 at 9:29 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Mon, Jul 13, 2020 at 04:59:32PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Implement the managed variant of krealloc(). This function works with
> > all memory allocated by devm_kmalloc() (or devres functions using it
> > implicitly like devm_kmemdup(), devm_kstrdup() etc.).
> >
> > Managed realloc'ed chunks can be manually released with devm_kfree().
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > ---
> > .../driver-api/driver-model/devres.rst | 1 +
> > drivers/base/devres.c | 67 +++++++++++++++++++
> > include/linux/device.h | 2 +
> > 3 files changed, 70 insertions(+)
> >
> > diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
> > index eaaaafc21134f..f318a5c0033c1 100644
> > --- a/Documentation/driver-api/driver-model/devres.rst
> > +++ b/Documentation/driver-api/driver-model/devres.rst
> > @@ -354,6 +354,7 @@ MEM
> > devm_kmalloc()
> > devm_kmalloc_array()
> > devm_kmemdup()
> > + devm_krealloc()
> > devm_kstrdup()
> > devm_kvasprintf()
> > devm_kzalloc()
> > diff --git a/drivers/base/devres.c b/drivers/base/devres.c
> > index ed615d3b9cf15..1775d35462300 100644
> > --- a/drivers/base/devres.c
> > +++ b/drivers/base/devres.c
> > @@ -837,6 +837,73 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
> > }
> > EXPORT_SYMBOL_GPL(devm_kmalloc);
> >
> > +/**
> > + * devm_krealloc - Resource-managed krealloc()
> > + * @dev: Device to re-allocate memory for
> > + * @ptr: Pointer to the memory chunk to re-allocate
> > + * @new_size: New allocation size
> > + * @gfp: Allocation gfp flags
> > + *
> > + * Managed krealloc(). Resizes the memory chunk allocated with devm_kmalloc().
> > + * Behaves similarly to regular krealloc(): if @ptr is NULL or ZERO_SIZE_PTR,
> > + * it's the equivalent of devm_kmalloc(). If new_size is zero, it returns
>
> 'it frees the previously allocated memory and returns'
>
> > + * ZERO_SIZE_PTR. This function doesn't change the order in which the release
> > + * callback for the re-alloc'ed devres will be called (except when falling back
> > + * to devm_kmalloc()
>
> 'or when freeing resources when new_size is zero'
>
This is nit-picking but ok. :)
[snip!]
> > +++ b/include/linux/device.h
> > @@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id);
> >
> > /* managed devm_k.alloc/kfree for device drivers */
> > void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
>
> > +void *devm_krealloc(struct device *dev, void *ptr, size_t size,
> > + gfp_t gfp) __must_check;
>
> Strange indentation, also you can move __must_check to the beginning of the
> declaration.
>
There's nothing wrong with this indentation, what do you mean?
__must_check is usually put at the end of the line.
[snip!]
Bart
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-07-14 14:48 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-13 14:59 [PATCH v4 0/3] devres: provide and use devm_krealloc() Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 1/3] devres: provide devm_krealloc() Bartosz Golaszewski
2020-07-13 19:29 ` Andy Shevchenko
2020-07-14 14:48 ` Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 2/3] hwmon: pmbus: use more devres helpers Bartosz Golaszewski
2020-07-13 14:59 ` [PATCH v4 3/3] iio: adc: xilinx-xadc: use devm_krealloc() Bartosz Golaszewski
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