[PATCH 00/18] genirq: Remove setup_irq()

[PATCH 00/18] genirq: Remove setup_irq()

[afzal mohammed]

While trying to understand internals of irq handling, came across a
thread [1] in which tglx was referring to avoid usage of setup_irq().
Existing callers of setup_irq() reached mostly via 'init_IRQ()' &
'time_init()', while memory allocators are ready by 'mm_init()'.

Hence instances of setup_irq() is replaced by request_irq() &
setup_irq() (along with remove_irq()) definition deleted in the last
patch.

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

Build & boot tested on ARM & x86_64 platforms (ensured that on the
machines used for testing there was an existing setup_irq()
invocation occuring at runtime)

Much of the changes were created using Coccinelle with an intention
to learn it. spatch command was directly run w/ semantic patch below.
But not everything could be automated.

Searching with 'git grep -n '\Wsetup_irq('' & avoiding the irrelevant
ones, 153 invocation's of setup_irq() were found. 112 could be replaced
w/ cocci, of which in a few files some desired hunks were missing or
not as expected, these were fixed up manually. Also the remaining 41
had to be done manually.

Although cocci could replace 112, because of line continue not
happening at paranthesis for request_irq(), around 80 had to be
manually aligned in the request_irq() statement. Problem was with my
below cocci snippet,

- setup_irq(E1,&act);
+ if (request_irq(E1,f_handler,f_flags,f_name,f_dev_id))
+ 	pr_err("request_irq() on %s failed\n", f_name);

Instead of the above, if below is used, line continue happens exactly
at paranthesis, but it lacks addition of printing on request_irq()
failure where existing setup_irq() failure was not doing it.

- setup_irq(E1,&act)
+ request_irq(E1,f_handler,f_flags,f_name,f_dev_id)

Above had an additional advantage of replacing instances of
if (setup_irq()) & BUG(setup_irq()), but luckily those instances were
very few.

So though many changes could be automated, there are a considerable
amount of manual changes, please review carefully especially mips &
alpha.

Usage of setup_percpu_irq() is untouched w/ this series.

There are 2 checkpatch warning about usage of BUG() [which was already
there w/ setup_irq()], they are left as is as it seems appropriate for
tick timer interrupt.

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

--->8---

@r1@
identifier ret;
@@

(
setup_irq(...);
|
ret = setup_irq(...);
)


@r2 depends on r1@
identifier act;
@@

static struct irqaction act = {
};

@r11 depends on r2@
identifier r2.act;
identifier f_handler;
@@

(
- act.handler = f_handler;
|
static struct irqaction act = {
 .handler = f_handler,
};
)

@r12 depends on r2@
identifier r2.act;
expression f_name;
@@

(
- act.name = f_name;
|
static struct irqaction act = {
 .name = f_name,
};
)

@r15 depends on r2@
identifier r2.act;
expression f_dev_id;
@@

(
- act.dev_id = f_dev_id;
|
static struct irqaction act = {
 .dev_id = f_dev_id,
};
)

@r16 depends on r2@
identifier r2.act;
expression f_flags;
@@

(
- act.flags = f_flags;
|
static struct irqaction act = {
 .flags = f_flags,
};
)

@r21 depends on r2@
identifier r2.act;
@@

- static struct irqaction act = {
- ...
- };

@r22 depends on r2 && r11 && r12 && r15 && r16@
identifier r2.act;
identifier r11.f_handler;
expression r12.f_name;
expression r15.f_dev_id;
expression r16.f_flags;
expression E1;
identifier ret;
@@

(
- setup_irq(E1,&act);
+ if (request_irq(E1,f_handler,f_flags,f_name,f_dev_id))
+ 	pr_err("request_irq() on %s failed\n", f_name);
|
- ret = setup_irq(E1,&act);
+ ret = request_irq(E1,f_handler,f_flags,f_name,f_dev_id);
)

@r23 depends on r2 && r11 && r12 && !r15 && r16@
identifier r2.act;
identifier r11.f_handler;
expression r12.f_name;
expression r16.f_flags;
expression E1;
identifier ret;
@@

(
- setup_irq(E1,&act);
+ if (request_irq(E1,f_handler,f_flags,f_name,NULL))
+ 	pr_err("request_irq() on %s failed\n", f_name);
|
- ret = setup_irq(E1,&act);
+ ret = request_irq(E1,f_handler,f_flags,f_name,NULL);
)

@r24 depends on r2 && r11 && r12 && r15 && !r16@
identifier r2.act;
identifier r11.f_handler;
expression r12.f_name;
expression r15.f_dev_id;
expression E1;
identifier ret;
@@

(
- setup_irq(E1,&act);
+ if (request_irq(E1,f_handler,0,f_name,f_dev_id))
+ 	pr_err("request_irq() on %s failed\n", f_name);
|
- ret = setup_irq(E1,&act);
+ ret = request_irq(E1,f_handler,0,f_name,f_dev_id);
)

@r25 depends on r2 && r11 && r12 && !r15 && !r16@
identifier r2.act;
identifier r11.f_handler;
expression r12.f_name;
expression E1;
identifier ret;
@@

(
- setup_irq(E1,&act);
+ if (request_irq(E1,f_handler,0,f_name,NULL))
+ 	pr_err("request_irq() on %s failed\n", f_name);
|
- ret = setup_irq(E1,&act);
+ ret = request_irq(E1,f_handler,0,f_name,NULL);
)

--->8---

afzal mohammed (18):
  alpha: replace setup_irq() by request_irq()
  ARM: replace setup_irq() by request_irq()
  c6x: replace setup_irq() by request_irq()
  hexagon: replace setup_irq() by request_irq()
  ia64: replace setup_irq() by request_irq()
  m68k: Replace setup_irq() by request_irq()
  microblaze: Replace setup_irq() by request_irq()
  MIPS: Replace setup_irq() by request_irq()
  parisc: Replace setup_irq() by request_irq()
  powerpc: Replace setup_irq() by request_irq()
  s390: replace setup_irq() by request_irq()
  sh: replace setup_irq() by request_irq()
  unicore32: replace setup_irq() by request_irq()
  x86: Replace setup_irq() by request_irq()
  xtensa: replace setup_irq() by request_irq()
  clocksource: Replace setup_irq() by request_irq()
  irqchip: Replace setup_irq() by request_irq()
  genirq: Remove setup_irq() and remove_irq()

 arch/alpha/kernel/irq_alpha.c                 | 29 ++-------
 arch/alpha/kernel/irq_i8259.c                 |  8 +--
 arch/alpha/kernel/irq_impl.h                  |  7 +--
 arch/alpha/kernel/irq_pyxis.c                 |  3 +-
 arch/alpha/kernel/sys_alcor.c                 |  3 +-
 arch/alpha/kernel/sys_cabriolet.c             |  3 +-
 arch/alpha/kernel/sys_eb64p.c                 |  3 +-
 arch/alpha/kernel/sys_marvel.c                |  2 +-
 arch/alpha/kernel/sys_miata.c                 |  6 +-
 arch/alpha/kernel/sys_ruffian.c               |  3 +-
 arch/alpha/kernel/sys_rx164.c                 |  3 +-
 arch/alpha/kernel/sys_sx164.c                 |  3 +-
 arch/alpha/kernel/sys_wildfire.c              |  7 +--
 arch/alpha/kernel/time.c                      |  6 +-
 arch/arm/mach-cns3xxx/core.c                  | 10 +---
 arch/arm/mach-ebsa110/core.c                  | 10 +---
 arch/arm/mach-ep93xx/timer-ep93xx.c           | 12 ++--
 arch/arm/mach-footbridge/dc21285-timer.c      | 11 +---
 arch/arm/mach-footbridge/isa-irq.c            |  8 +--
 arch/arm/mach-footbridge/isa-timer.c          | 11 +---
 arch/arm/mach-iop32x/time.c                   | 12 ++--
 arch/arm/mach-mmp/time.c                      | 11 +---
 arch/arm/mach-omap1/pm.c                      | 22 ++++---
 arch/arm/mach-omap1/time.c                    | 10 +---
 arch/arm/mach-omap1/timer32k.c                | 10 +---
 arch/arm/mach-omap2/timer.c                   | 11 +---
 arch/arm/mach-rpc/time.c                      |  8 +--
 arch/arm/mach-spear/time.c                    |  9 +--
 arch/arm/plat-orion/time.c                    | 10 +---
 arch/c6x/platforms/timer64.c                  | 11 +---
 arch/hexagon/kernel/smp.c                     | 17 +++---
 arch/hexagon/kernel/time.c                    | 11 +---
 arch/ia64/kernel/irq_ia64.c                   | 42 +++++--------
 arch/ia64/kernel/mca.c                        | 51 +++++-----------
 arch/m68k/68000/timers.c                      |  9 +--
 arch/m68k/coldfire/pit.c                      |  9 +--
 arch/m68k/coldfire/sltimers.c                 | 19 ++----
 arch/m68k/coldfire/timers.c                   | 19 ++----
 arch/microblaze/kernel/timer.c                | 10 +---
 arch/mips/alchemy/common/time.c               | 11 +---
 arch/mips/ar7/irq.c                           | 18 +++---
 arch/mips/ath25/ar2315.c                      |  9 +--
 arch/mips/ath25/ar5312.c                      |  9 +--
 arch/mips/bcm63xx/irq.c                       | 38 +++++-------
 arch/mips/cobalt/irq.c                        | 14 ++---
 arch/mips/dec/setup.c                         | 59 ++++++++-----------
 arch/mips/emma/markeins/irq.c                 | 20 +++----
 arch/mips/include/asm/sni.h                   |  2 +-
 arch/mips/jazz/irq.c                          | 12 +---
 arch/mips/kernel/cevt-bcm1480.c               | 11 +---
 arch/mips/kernel/cevt-ds1287.c                |  9 +--
 arch/mips/kernel/cevt-gt641xx.c               |  9 +--
 arch/mips/kernel/cevt-r4k.c                   |  4 +-
 arch/mips/kernel/cevt-sb1250.c                | 11 +---
 arch/mips/kernel/cevt-txx9.c                  | 11 +---
 arch/mips/kernel/i8253.c                      | 10 +---
 arch/mips/kernel/rtlx-mt.c                    |  8 +--
 arch/mips/kernel/smp.c                        | 33 ++++-------
 arch/mips/lasat/interrupt.c                   | 10 +---
 arch/mips/loongson2ef/common/bonito-irq.c     |  9 +--
 .../loongson2ef/common/cs5536/cs5536_mfgpt.c  | 10 +---
 arch/mips/loongson2ef/fuloong-2e/irq.c        | 14 ++---
 arch/mips/loongson2ef/lemote-2f/irq.c         | 20 ++-----
 arch/mips/loongson32/common/irq.c             | 21 ++++---
 arch/mips/loongson32/common/time.c            | 12 ++--
 arch/mips/loongson64/hpet.c                   | 10 +---
 arch/mips/mti-malta/malta-int.c               | 10 +---
 arch/mips/netlogic/xlr/fmn.c                  |  9 +--
 arch/mips/pmcs-msp71xx/msp_irq.c              | 28 ++++-----
 arch/mips/pmcs-msp71xx/msp_smp.c              | 22 ++-----
 arch/mips/pmcs-msp71xx/msp_time.c             |  7 ++-
 arch/mips/ralink/cevt-rt3352.c                | 17 +++---
 arch/mips/sgi-ip22/ip22-eisa.c                |  8 +--
 arch/mips/sgi-ip22/ip22-int.c                 | 49 +++++----------
 arch/mips/sgi-ip32/ip32-irq.c                 | 18 ++----
 arch/mips/sni/a20r.c                          |  4 +-
 arch/mips/sni/irq.c                           |  8 +--
 arch/mips/sni/pcit.c                          |  8 ++-
 arch/mips/sni/rm200.c                         | 23 +++-----
 arch/mips/sni/time.c                          | 10 +---
 arch/mips/vr41xx/common/irq.c                 |  9 +--
 arch/parisc/kernel/irq.c                      | 21 ++-----
 arch/powerpc/platforms/85xx/mpc85xx_cds.c     | 10 +---
 arch/powerpc/platforms/8xx/cpm1.c             |  9 +--
 arch/powerpc/platforms/8xx/m8xx_setup.c       |  9 +--
 arch/powerpc/platforms/chrp/setup.c           | 14 ++---
 arch/powerpc/platforms/powermac/pic.c         | 31 ++++------
 arch/powerpc/platforms/powermac/smp.c         |  9 +--
 arch/s390/kernel/irq.c                        |  8 +--
 arch/sh/boards/mach-cayman/irq.c              | 18 ++----
 arch/sh/drivers/dma/dma-pvr2.c                |  9 +--
 arch/unicore32/kernel/time.c                  | 11 +---
 arch/x86/kernel/irqinit.c                     | 18 +++---
 arch/x86/kernel/time.c                        | 10 +---
 arch/xtensa/kernel/smp.c                      |  8 +--
 arch/xtensa/kernel/time.c                     | 10 +---
 drivers/clocksource/bcm2835_timer.c           |  8 +--
 drivers/clocksource/bcm_kona_timer.c          | 10 +---
 drivers/clocksource/dw_apb_timer.c            | 11 +---
 drivers/clocksource/exynos_mct.c              | 12 ++--
 drivers/clocksource/mxs_timer.c               | 10 +---
 drivers/clocksource/nomadik-mtu.c             | 11 +---
 drivers/clocksource/samsung_pwm_timer.c       | 12 ++--
 drivers/clocksource/timer-atlas7.c            | 50 ++++++++--------
 drivers/clocksource/timer-cs5535.c            | 10 +---
 drivers/clocksource/timer-efm32.c             | 10 +---
 drivers/clocksource/timer-fsl-ftm.c           | 10 +---
 drivers/clocksource/timer-imx-gpt.c           | 10 +---
 drivers/clocksource/timer-integrator-ap.c     | 11 +---
 drivers/clocksource/timer-meson6.c            | 11 +---
 drivers/clocksource/timer-orion.c             |  9 +--
 drivers/clocksource/timer-prima2.c            | 11 +---
 drivers/clocksource/timer-pxa.c               | 10 +---
 drivers/clocksource/timer-sp804.c             | 11 +---
 drivers/clocksource/timer-u300.c              |  9 +--
 drivers/clocksource/timer-vf-pit.c            | 10 +---
 drivers/clocksource/timer-vt8500.c            | 11 +---
 drivers/clocksource/timer-zevio.c             | 13 ++--
 drivers/irqchip/irq-i8259.c                   |  9 +--
 drivers/irqchip/irq-ingenic.c                 | 11 ++--
 drivers/parisc/eisa.c                         |  8 +--
 drivers/s390/cio/airq.c                       |  8 +--
 drivers/s390/cio/cio.c                        |  8 +--
 include/linux/dw_apb_timer.h                  |  1 -
 include/linux/irq.h                           |  2 -
 kernel/irq/manage.c                           | 44 --------------
 126 files changed, 528 insertions(+), 1111 deletions(-)


base-commit: v5.6-rc1
-- 
2.24.1

[PATCH 10/18] powerpc: Replace setup_irq() by request_irq()

[afzal mohammed]

request_irq() is preferred over setup_irq(). Existing callers of
setup_irq() reached mostly via 'init_IRQ()' & 'time_init()', while
memory allocators are ready by 'mm_init()'.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
---

Since cc'ing cover letter to all maintainers/reviewers would be too
many, refer for cover letter,
 https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com

 arch/powerpc/platforms/85xx/mpc85xx_cds.c | 10 +++-----
 arch/powerpc/platforms/8xx/cpm1.c         |  9 ++-----
 arch/powerpc/platforms/8xx/m8xx_setup.c   |  9 ++-----
 arch/powerpc/platforms/chrp/setup.c       | 14 ++++------
 arch/powerpc/platforms/powermac/pic.c     | 31 ++++++++++-------------
 arch/powerpc/platforms/powermac/smp.c     |  9 ++-----
 6 files changed, 27 insertions(+), 55 deletions(-)

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 6b1436abe9b1..1c5598877d70 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -218,12 +218,6 @@ static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
 {
 	return IRQ_HANDLED;
 }
-
-static struct irqaction mpc85xxcds_8259_irqaction = {
-	.handler = mpc85xx_8259_cascade_action,
-	.flags = IRQF_SHARED | IRQF_NO_THREAD,
-	.name = "8259 cascade",
-};
 #endif /* PPC_I8259 */
 #endif /* CONFIG_PCI */
 
@@ -271,7 +265,9 @@ static int mpc85xx_cds_8259_attach(void)
 	 *  disabled when the last user of the shared IRQ line frees their
 	 *  interrupt.
 	 */
-	if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
+	ret = request_irq(cascade_irq, mpc85xx_8259_cascade_action,
+			  IRQF_SHARED | IRQF_NO_THREAD, "8259 cascade", NULL);
+	if (ret) {
 		printk(KERN_ERR "Failed to setup cascade interrupt\n");
 		return ret;
 	}
diff --git a/arch/powerpc/platforms/8xx/cpm1.c b/arch/powerpc/platforms/8xx/cpm1.c
index a43ee7d1ff85..4db4ca2e1222 100644
--- a/arch/powerpc/platforms/8xx/cpm1.c
+++ b/arch/powerpc/platforms/8xx/cpm1.c
@@ -120,12 +120,6 @@ static irqreturn_t cpm_error_interrupt(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction cpm_error_irqaction = {
-	.handler = cpm_error_interrupt,
-	.flags = IRQF_NO_THREAD,
-	.name = "error",
-};
-
 static const struct irq_domain_ops cpm_pic_host_ops = {
 	.map = cpm_pic_host_map,
 };
@@ -187,7 +181,8 @@ unsigned int __init cpm_pic_init(void)
 	if (!eirq)
 		goto end;
 
-	if (setup_irq(eirq, &cpm_error_irqaction))
+	if (request_irq(eirq, cpm_error_interrupt, IRQF_NO_THREAD, "error",
+			NULL))
 		printk(KERN_ERR "Could not allocate CPM error IRQ!");
 
 	setbits32(&cpic_reg->cpic_cicr, CICR_IEN);
diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index f1c805c8adbc..df4d57d07f9a 100644
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -39,12 +39,6 @@ static irqreturn_t timebase_interrupt(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction tbint_irqaction = {
-	.handler = timebase_interrupt,
-	.flags = IRQF_NO_THREAD,
-	.name = "tbint",
-};
-
 /* per-board overridable init_internal_rtc() function. */
 void __init __attribute__ ((weak))
 init_internal_rtc(void)
@@ -157,7 +151,8 @@ void __init mpc8xx_calibrate_decr(void)
 					(TBSCR_TBF | TBSCR_TBE));
 	immr_unmap(sys_tmr2);
 
-	if (setup_irq(virq, &tbint_irqaction))
+	if (request_irq(virq, timebase_interrupt, IRQF_NO_THREAD, "tbint",
+			NULL))
 		panic("Could not allocate timer IRQ!");
 }
 
diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index fcf6f2342ef4..95ac1f510b1e 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -451,13 +451,6 @@ static void __init chrp_find_openpic(void)
 	of_node_put(np);
 }
 
-#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
-static struct irqaction xmon_irqaction = {
-	.handler = xmon_irq,
-	.name = "XMON break",
-};
-#endif
-
 static void __init chrp_find_8259(void)
 {
 	struct device_node *np, *pic = NULL;
@@ -541,8 +534,11 @@ static void __init chrp_init_IRQ(void)
 		if (of_node_is_type(kbd->parent, "adb"))
 			break;
 	of_node_put(kbd);
-	if (kbd)
-		setup_irq(HYDRA_INT_ADB_NMI, &xmon_irqaction);
+	if (kbd) {
+		if (request_irq(HYDRA_INT_ADB_NMI, xmon_irq, 0, "XMON break",
+				NULL))
+			pr_err("request_irq() on %s failed\n", "XMON break");
+	}
 #endif
 }
 
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 2e969073473d..939ae39d81db 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -250,20 +250,6 @@ static unsigned int pmac_pic_get_irq(void)
 	return irq_linear_revmap(pmac_pic_host, irq);
 }
 
-#ifdef CONFIG_XMON
-static struct irqaction xmon_action = {
-	.handler	= xmon_irq,
-	.flags		= IRQF_NO_THREAD,
-	.name		= "NMI - XMON"
-};
-#endif
-
-static struct irqaction gatwick_cascade_action = {
-	.handler	= gatwick_action,
-	.flags		= IRQF_NO_THREAD,
-	.name		= "cascade",
-};
-
 static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node,
 			       enum irq_domain_bus_token bus_token)
 {
@@ -384,12 +370,17 @@ static void __init pmac_pic_probe_oldstyle(void)
 		out_le32(&pmac_irq_hw[i]->enable, 0);
 
 	/* Hookup cascade irq */
-	if (slave && pmac_irq_cascade)
-		setup_irq(pmac_irq_cascade, &gatwick_cascade_action);
+	if (slave && pmac_irq_cascade) {
+		if (request_irq(pmac_irq_cascade, gatwick_action,
+				IRQF_NO_THREAD, "cascade", NULL))
+			pr_err("request_irq() on %s failed\n", "cascade");
+	}
 
 	printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs);
 #ifdef CONFIG_XMON
-	setup_irq(irq_create_mapping(NULL, 20), &xmon_action);
+	if (request_irq(irq_create_mapping(NULL, 20), xmon_irq, IRQF_NO_THREAD,
+			"NMI - XMON", NULL))
+		pr_err("request_irq() on %s failed\n", "NMI - XMON");
 #endif
 }
 
@@ -441,7 +432,11 @@ static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
 		nmi_irq = irq_of_parse_and_map(pswitch, 0);
 		if (nmi_irq) {
 			mpic_irq_set_priority(nmi_irq, 9);
-			setup_irq(nmi_irq, &xmon_action);
+			if (request_irq(nmi_irq, xmon_irq, IRQF_NO_THREAD,
+					"NMI - XMON", NULL)) {
+				pr_err("request_irq() on %s failed\n",
+				       "NMI - XMON");
+			}
 		}
 		of_node_put(pswitch);
 	}
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index f95fbdee6efe..0121b31a9e7b 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -399,12 +399,6 @@ static int __init smp_psurge_kick_cpu(int nr)
 	return 0;
 }
 
-static struct irqaction psurge_irqaction = {
-	.handler = psurge_ipi_intr,
-	.flags = IRQF_PERCPU | IRQF_NO_THREAD,
-	.name = "primary IPI",
-};
-
 static void __init smp_psurge_setup_cpu(int cpu_nr)
 {
 	if (cpu_nr != 0 || !psurge_start)
@@ -413,7 +407,8 @@ static void __init smp_psurge_setup_cpu(int cpu_nr)
 	/* reset the entry point so if we get another intr we won't
 	 * try to startup again */
 	out_be32(psurge_start, 0x100);
-	if (setup_irq(irq_create_mapping(NULL, 30), &psurge_irqaction))
+	if (request_irq(irq_create_mapping(NULL, 30), psurge_ipi_intr,
+			IRQF_PERCPU | IRQF_NO_THREAD, "primary IPI", NULL))
 		printk(KERN_ERR "Couldn't get primary IPI interrupt");
 }
 
-- 
2.24.1

Re: [PATCH 10/18] powerpc: Replace setup_irq() by request_irq()

[Christophe Leroy]

Le 12/02/2020 à 09:04, afzal mohammed a écrit :
> request_irq() is preferred over setup_irq(). Existing callers of
> setup_irq() reached mostly via 'init_IRQ()' & 'time_init()', while
> memory allocators are ready by 'mm_init()'.
> 
> Per tglx[1], setup_irq() existed in olden days when allocators were not
> ready by the time early interrupts were initialized.
> 
> Hence replace setup_irq() by request_irq().
> 
> Seldom remove_irq() usage has been observed coupled with setup_irq(),
> wherever that has been found, it too has been replaced by free_irq().
> 
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
> 
> Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>

Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # for the 8xx parts

> ---
> 
> Since cc'ing cover letter to all maintainers/reviewers would be too
> many, refer for cover letter,
>   https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com
> 
>   arch/powerpc/platforms/85xx/mpc85xx_cds.c | 10 +++-----
>   arch/powerpc/platforms/8xx/cpm1.c         |  9 ++-----
>   arch/powerpc/platforms/8xx/m8xx_setup.c   |  9 ++-----
>   arch/powerpc/platforms/chrp/setup.c       | 14 ++++------
>   arch/powerpc/platforms/powermac/pic.c     | 31 ++++++++++-------------
>   arch/powerpc/platforms/powermac/smp.c     |  9 ++-----
>   6 files changed, 27 insertions(+), 55 deletions(-)
> 

Re: [PATCH 00/18] genirq: Remove setup_irq()

[Thomas Gleixner]

Afzal,

afzal mohammed <afzal.mohd.ma@gmail.com> writes:

> While trying to understand internals of irq handling, came across a
> thread [1] in which tglx was referring to avoid usage of setup_irq().
> Existing callers of setup_irq() reached mostly via 'init_IRQ()' &
> 'time_init()', while memory allocators are ready by 'mm_init()'.
>
> Hence instances of setup_irq() is replaced by request_irq() &
> setup_irq() (along with remove_irq()) definition deleted in the last
> patch.
>
> Seldom remove_irq() usage has been observed coupled with setup_irq(),
> wherever that has been found, it too has been replaced by free_irq().

thanks a lot for tackling this!

Vs. merging this series, I suggest the following approach:

   - Resubmit the individual changes as single patches or small series
     to the relevant maintainers and subsystem mailing lists. They have
     no dependency on a core change and can be applied where they belong
     to.

   - After 5.6-rc6, verify which parts have made their way into
     linux-next and resubmit the ignored ones as a series to me along
     with the removal of the core parts.

That way we can avoid conflicting changes between subsystems and the tip
irq/core branch as much as possible.

Thanks,

        tglx

Re: [PATCH 00/18] genirq: Remove setup_irq()

[afzal mohammed]

Hi Thomas,

On Thu, Feb 27, 2020 at 11:31:15AM +0100, Thomas Gleixner wrote:

> Vs. merging this series, I suggest the following approach:
> 
>    - Resubmit the individual changes as single patches or small series
>      to the relevant maintainers and subsystem mailing lists. They have
>      no dependency on a core change and can be applied where they belong
>      to.
> 
>    - After 5.6-rc6, verify which parts have made their way into
>      linux-next and resubmit the ignored ones as a series to me along
>      with the removal of the core parts.
> 
> That way we can avoid conflicting changes between subsystems and the tip
> irq/core branch as much as possible.

Okay, i will do accordingly.

[ your mail crossed my v3 (only one patch) posting ]

Regards
afzal

Re: [PATCH 00/18] genirq: Remove setup_irq()

[afzal mohammed]

Hi Thomas,

On Thu, Feb 27, 2020 at 04:37:13PM +0530, afzal mohammed wrote:
> On Thu, Feb 27, 2020 at 11:31:15AM +0100, Thomas Gleixner wrote:

> > Vs. merging this series, I suggest the following approach:
> > 
> >    - Resubmit the individual changes as single patches or small series
> >      to the relevant maintainers and subsystem mailing lists. They have
> >      no dependency on a core change and can be applied where they belong
> >      to.
> > 
> >    - After 5.6-rc6, verify which parts have made their way into
> >      linux-next and resubmit the ignored ones as a series to me along
> >      with the removal of the core parts.
> > 
> > That way we can avoid conflicting changes between subsystems and the tip
> > irq/core branch as much as possible.
> 
> Okay, i will do accordingly.

i am on it, is delayed due to the reason as mentioned at,

https://lkml.kernel.org/r/20200321172626.GA6323@afzalpc

[ not repeating contents here since other mail was sent just now,
  cc'ing you ]

Regards
afzal

[PATCH 0/6] Kill setup_irq()

[afzal mohammed]

Hi Thomas,

As compared to the situation mentioned earlier[1], now powerpc patch is
also in -next, and the pending ARM patches has been picked up by ARM SoC
maintainers today and is expected to show up in next -next. All other
subsytem patches has been picked by relevant maintainers & are already
in -next except alpha, c6x, hexagon, unicore32 & sh.

As it is the case, i am sending you patches for the above 5
architecture's plus the core removal patch.

Status of 5 arch's:
-------------------
alpha:		received ack from Matt Turner, build test success
c6x:		did receive ack from Mark Salter in v1, the final
		 version (v3) was with minor changes, hence removed his
		 ack & cc'ed him, build test success
hexagon:	build test success
unicore32:	couldn't get toolchain from kernel.org, 0day test robot
		 or Segher's buildall
sh:		To compile the relevant changes sh64 compiler is
		 required, couldn't get it from above mentioned 3
		 sources.

Note 1: sh toolchain is available, but that will not make the
 relevant changes compile as it has dependency of 64bit arch toolchain,
 did try a Kconfig hack to make it compile w/ 32bit sh toolchain, but it
 failed due to other reasons (unknown operands), so gave up on that.
Note 2: hexagon final image creation fails even w/o my patch, but it
 has been ensured that w/ my changes relevant object files are getting
 built  w/o warnings.

Regards
afzal

[1] https://lkml.kernel.org/r/20200321172626.GA6323@afzalpc

afzal mohammed (6):
  alpha: Replace setup_irq() by request_irq()
  c6x: replace setup_irq() by request_irq()
  hexagon: replace setup_irq() by request_irq()
  sh: replace setup_irq() by request_irq()
  unicore32: replace setup_irq() by request_irq()
  genirq: Remove setup_irq() and remove_irq()

 arch/alpha/kernel/irq_alpha.c     | 29 ++++----------------
 arch/alpha/kernel/irq_i8259.c     |  8 ++----
 arch/alpha/kernel/irq_impl.h      |  7 +----
 arch/alpha/kernel/irq_pyxis.c     |  3 ++-
 arch/alpha/kernel/sys_alcor.c     |  3 ++-
 arch/alpha/kernel/sys_cabriolet.c |  3 ++-
 arch/alpha/kernel/sys_eb64p.c     |  3 ++-
 arch/alpha/kernel/sys_marvel.c    |  2 +-
 arch/alpha/kernel/sys_miata.c     |  6 +++--
 arch/alpha/kernel/sys_ruffian.c   |  3 ++-
 arch/alpha/kernel/sys_rx164.c     |  3 ++-
 arch/alpha/kernel/sys_sx164.c     |  3 ++-
 arch/alpha/kernel/sys_wildfire.c  |  7 ++---
 arch/alpha/kernel/time.c          |  6 ++---
 arch/c6x/platforms/timer64.c      | 11 +++-----
 arch/hexagon/kernel/smp.c         | 22 ++++++++--------
 arch/hexagon/kernel/time.c        | 11 +++-----
 arch/sh/boards/mach-cayman/irq.c  | 18 +++++--------
 arch/sh/drivers/dma/dma-pvr2.c    |  9 +++----
 arch/unicore32/kernel/time.c      | 11 +++-----
 include/linux/irq.h               |  2 --
 kernel/irq/manage.c               | 44 -------------------------------
 22 files changed, 60 insertions(+), 154 deletions(-)

-- 
2.25.1

RE: [PATCH 0/6] Kill setup_irq()

[Brian Cain]

> -----Original Message-----
> From: linux-hexagon-owner@vger.kernel.org <linux-hexagon-
> owner@vger.kernel.org> On Behalf Of afzal mohammed
> Sent: Friday, March 27, 2020 11:08 AM
> To: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linux-samsung-soc@vger.kernel.org; x86@kernel.org; linux-
> sh@vger.kernel.org; linux-s390@vger.kernel.org; linuxppc-
> dev@lists.ozlabs.org; linux-parisc@vger.kernel.org; linux-
> mips@vger.kernel.org; linux-m68k@lists.linux-m68k.org; linux-
> ia64@vger.kernel.org; linux-hexagon@vger.kernel.org; linux-c6x-dev@linux-
> c6x.org; linux-omap@vger.kernel.org; linux-alpha@vger.kernel.org
> Subject: [PATCH 0/6] Kill setup_irq()
...
> Note 1: sh toolchain is available, but that will not make the  relevant
changes
> compile as it has dependency of 64bit arch toolchain,  did try a Kconfig
hack
> to make it compile w/ 32bit sh toolchain, but it  failed due to other
reasons
> (unknown operands), so gave up on that.
> Note 2: hexagon final image creation fails even w/o my patch, but it  has
> been ensured that w/ my changes relevant object files are getting  built
w/o
> warnings.

Afzal,

	What's the nature of the failure in "Note 2"?

-Brian

Re: [PATCH 0/6] Kill setup_irq()

[afzal mohammed]

Hi Brian,

On Fri, Mar 27, 2020 at 09:48:38PM -0500, Brian Cain wrote:

> > Note 2: hexagon final image creation fails even w/o my patch

> 	What's the nature of the failure in "Note 2"?

drivers/base/firmware_loader/main.o: In function `fw_is_builtin_firmware':
/devel/src/kernel6/drivers/base/firmware_loader/main.c:132:(.text+0xc8): relocation truncated to fit: R_HEX_16_X against symbol `__start_builtin_fw' defined in .modinfo section in .tmp_vmlinux1
Makefile:1077: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

[ i had deleted the toolchain earlier, since you asked, download again &
checked ]

Regards
afzal

RE: [PATCH 0/6] Kill setup_irq()

[Brian Cain]

> -----Original Message-----
> From: linux-hexagon-owner@vger.kernel.org <linux-hexagon-
> owner@vger.kernel.org> On Behalf Of afzal mohammed
...
> On Fri, Mar 27, 2020 at 09:48:38PM -0500, Brian Cain wrote:
> 
> > > Note 2: hexagon final image creation fails even w/o my patch
> 
> > 	What's the nature of the failure in "Note 2"?
> 
> drivers/base/firmware_loader/main.o: In function `fw_is_builtin_firmware':
> /devel/src/kernel6/drivers/base/firmware_loader/main.c:132:(.text+0xc8):
> relocation truncated to fit: R_HEX_16_X against symbol
`__start_builtin_fw'
> defined in .modinfo section in .tmp_vmlinux1
> Makefile:1077: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1

Thanks for reporting it -- I will make a patch to fix it.

-Brian