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watchdog/buddy: cleanup how watchdog_buddy_check_hardlockup() is called 

In the patch ("watchdog/hardlockup: detect hard lockups using secondary
(buddy) CPUs"), we added a call from the common watchdog.c file into the
buddy.  That call could be done more cleanly.  Specifically:

1. If we move the call into watchdog_hardlockup_kick() then it keeps
   watchdog_timer_fn() simpler.
2. We don't need to pass an "unsigned long" to the buddy for the timer
   count. In the patch ("watchdog/hardlockup: add a "cpu" param to
   watchdog_hardlockup_check()") the count was changed to "atomic_t"
   which is backed by an int, so we should match types.

Link: https://lkml.kernel.org/r/20230526184139.6.I006c7d958a1ea5c4e1e4dc44a25596d9bb5fd3ba@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Douglas Anderson 2023-05-26 18:41:36 -07:00 committed by Andrew Morton
parent 05e7b55876
commit d3b62ace0f
3 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/nmi.h
View File

@ -114,9 +114,9 @@ void watchdog_hardlockup_disable(unsigned int cpu);
void lockup_detector_reconfigure(void);
#ifdef CONFIG_HARDLOCKUP_DETECTOR_BUDDY
void watchdog_buddy_check_hardlockup(unsigned long hrtimer_interrupts);
void watchdog_buddy_check_hardlockup(int hrtimer_interrupts);
#else
static inline void watchdog_buddy_check_hardlockup(unsigned long hrtimer_interrupts) {}
static inline void watchdog_buddy_check_hardlockup(int hrtimer_interrupts) {}
#endif
/**

15
kernel/watchdog.c
View File

@ -131,9 +131,12 @@ static bool is_hardlockup(unsigned int cpu)
return false;
}
static unsigned long watchdog_hardlockup_kick(void)
static void watchdog_hardlockup_kick(void)
{
return atomic_inc_return(this_cpu_ptr(&hrtimer_interrupts));
int new_interrupts;
new_interrupts = atomic_inc_return(this_cpu_ptr(&hrtimer_interrupts));
watchdog_buddy_check_hardlockup(new_interrupts);
}
void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
@ -195,7 +198,7 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
#else /* CONFIG_HARDLOCKUP_DETECTOR_COUNTS_HRTIMER */
static inline unsigned long watchdog_hardlockup_kick(void) { return 0; }
static inline void watchdog_hardlockup_kick(void) { }
#endif /* !CONFIG_HARDLOCKUP_DETECTOR_COUNTS_HRTIMER */
@ -449,15 +452,11 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
struct pt_regs *regs = get_irq_regs();
int duration;
int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace;
unsigned long hrtimer_interrupts;
if (!watchdog_enabled)
return HRTIMER_NORESTART;
hrtimer_interrupts = watchdog_hardlockup_kick();
/* test for hardlockups */
watchdog_buddy_check_hardlockup(hrtimer_interrupts);
watchdog_hardlockup_kick();
/* kick the softlockup detector */
if (completion_done(this_cpu_ptr(&softlockup_completion))) {

2
kernel/watchdog_buddy.c
View File

@ -72,7 +72,7 @@ void watchdog_hardlockup_disable(unsigned int cpu)
cpumask_clear_cpu(cpu, &watchdog_cpus);
}
void watchdog_buddy_check_hardlockup(unsigned long hrtimer_interrupts)
void watchdog_buddy_check_hardlockup(int hrtimer_interrupts)
{
unsigned int next_cpu;