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kernel/watchdog: introduce arch_touch_nmi_watchdog()
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For architectures that define HAVE_NMI_WATCHDOG, instead of having them
provide the complete touch_nmi_watchdog() function, just have them
provide arch_touch_nmi_watchdog().

This gives the generic code more flexibility in implementing this
function, and arch implementations don't miss out on touching the
softlockup watchdog or other generic details.

Link: http://lkml.kernel.org/r/20170616065715.18390-3-npiggin@gmail.com
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Don Zickus <dzickus@redhat.com>
Reviewed-by: Babu Moger <babu.moger@oracle.com>
Tested-by: Babu Moger <babu.moger@oracle.com>	[sparc]
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
npiggin authored and torvalds committed Jul 12, 2017
1 parent 24bb446 commit f2e0cff
Showing 9 changed files with 31 additions and 24 deletions.
2 changes: 2 additions & 0 deletions arch/blackfin/include/asm/nmi.h
Original file line number Diff line number Diff line change
@@ -9,4 +9,6 @@

#include <linux/nmi.h>

extern void arch_touch_nmi_watchdog(void);

#endif
2 changes: 1 addition & 1 deletion arch/blackfin/kernel/nmi.c
Original file line number Diff line number Diff line change
@@ -190,7 +190,7 @@ static int __init init_nmi_wdt(void)
}
device_initcall(init_nmi_wdt);

void touch_nmi_watchdog(void)
void arch_touch_nmi_watchdog(void)
{
atomic_set(&nmi_touched[smp_processor_id()], 1);
}
2 changes: 2 additions & 0 deletions arch/mn10300/include/asm/nmi.h
Original file line number Diff line number Diff line change
@@ -11,4 +11,6 @@
#ifndef _ASM_NMI_H
#define _ASM_NMI_H

extern void arch_touch_nmi_watchdog(void);

#endif /* _ASM_NMI_H */
8 changes: 4 additions & 4 deletions arch/mn10300/kernel/mn10300-watchdog-low.S
Original file line number Diff line number Diff line change
@@ -50,9 +50,9 @@ watchdog_handler:
# we can't inline it)
#
###############################################################################
.globl touch_nmi_watchdog
.type touch_nmi_watchdog,@function
touch_nmi_watchdog:
.globl arch_touch_nmi_watchdog
.type arch_touch_nmi_watchdog,@function
arch_touch_nmi_watchdog:
clr d0
clr d1
mov watchdog_alert_counter, a0
@@ -63,4 +63,4 @@ touch_nmi_watchdog:
lne
ret [],0

.size touch_nmi_watchdog,.-touch_nmi_watchdog
.size arch_touch_nmi_watchdog,.-arch_touch_nmi_watchdog
2 changes: 1 addition & 1 deletion arch/mn10300/kernel/mn10300-watchdog.c
Original file line number Diff line number Diff line change
@@ -31,7 +31,7 @@ static unsigned int watchdog;
static unsigned int watchdog_hz = 1;
unsigned int watchdog_alert_counter[NR_CPUS];

EXPORT_SYMBOL(touch_nmi_watchdog);
EXPORT_SYMBOL(arch_touch_nmi_watchdog);

/*
* the best way to detect whether a CPU has a 'hard lockup' problem
1 change: 1 addition & 0 deletions arch/sparc/include/asm/nmi.h
Original file line number Diff line number Diff line change
@@ -7,6 +7,7 @@ void nmi_adjust_hz(unsigned int new_hz);

extern atomic_t nmi_active;

void arch_touch_nmi_watchdog(void);
void start_nmi_watchdog(void *unused);
void stop_nmi_watchdog(void *unused);

6 changes: 2 additions & 4 deletions arch/sparc/kernel/nmi.c
Original file line number Diff line number Diff line change
@@ -51,7 +51,7 @@ static DEFINE_PER_CPU(unsigned int, last_irq_sum);
static DEFINE_PER_CPU(long, alert_counter);
static DEFINE_PER_CPU(int, nmi_touch);

void touch_nmi_watchdog(void)
void arch_touch_nmi_watchdog(void)
{
if (atomic_read(&nmi_active)) {
int cpu;
@@ -61,10 +61,8 @@ void touch_nmi_watchdog(void)
per_cpu(nmi_touch, cpu) = 1;
}
}

touch_softlockup_watchdog();
}
EXPORT_SYMBOL(touch_nmi_watchdog);
EXPORT_SYMBOL(arch_touch_nmi_watchdog);

static void die_nmi(const char *str, struct pt_regs *regs, int do_panic)
{
27 changes: 16 additions & 11 deletions include/linux/nmi.h
Original file line number Diff line number Diff line change
@@ -6,6 +6,9 @@

#include <linux/sched.h>
#include <asm/irq.h>
#if defined(CONFIG_HAVE_NMI_WATCHDOG)
#include <asm/nmi.h>
#endif

#ifdef CONFIG_LOCKUP_DETECTOR
extern void touch_softlockup_watchdog_sched(void);
@@ -58,28 +61,30 @@ static inline void reset_hung_task_detector(void)
#define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT)
#define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT)

#if defined(CONFIG_HARDLOCKUP_DETECTOR)
extern void hardlockup_detector_disable(void);
#else
static inline void hardlockup_detector_disable(void) {}
#endif

#if defined(CONFIG_HARDLOCKUP_DETECTOR) || defined(CONFIG_HAVE_NMI_WATCHDOG)
extern void arch_touch_nmi_watchdog(void);
#else
static inline void arch_touch_nmi_watchdog(void) {}
#endif

/**
* touch_nmi_watchdog - restart NMI watchdog timeout.
*
* If the architecture supports the NMI watchdog, touch_nmi_watchdog()
* may be used to reset the timeout - for code which intentionally
* disables interrupts for a long time. This call is stateless.
*/
#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
#include <asm/nmi.h>
extern void touch_nmi_watchdog(void);
#else
static inline void touch_nmi_watchdog(void)
{
arch_touch_nmi_watchdog();
touch_softlockup_watchdog();
}
#endif

#if defined(CONFIG_HARDLOCKUP_DETECTOR)
extern void hardlockup_detector_disable(void);
#else
static inline void hardlockup_detector_disable(void) {}
#endif

/*
* Create trigger_all_cpu_backtrace() out of the arch-provided
5 changes: 2 additions & 3 deletions kernel/watchdog_hld.c
Original file line number Diff line number Diff line change
@@ -56,7 +56,7 @@ static int __init hardlockup_panic_setup(char *str)
}
__setup("nmi_watchdog=", hardlockup_panic_setup);

void touch_nmi_watchdog(void)
void arch_touch_nmi_watchdog(void)
{
/*
* Using __raw here because some code paths have
@@ -66,9 +66,8 @@ void touch_nmi_watchdog(void)
* going off.
*/
raw_cpu_write(watchdog_nmi_touch, true);
touch_softlockup_watchdog();
}
EXPORT_SYMBOL(touch_nmi_watchdog);
EXPORT_SYMBOL(arch_touch_nmi_watchdog);

static struct perf_event_attr wd_hw_attr = {
.type = PERF_TYPE_HARDWARE,

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