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watchdog: use suspend/resume interface in fixup_ht_bug()

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Remove watchdog_nmi_disable_all() and watchdog_nmi_enable_all() since
these functions are no longer needed.  If a subsystem has a need to
deactivate the watchdog temporarily, it should utilize the
watchdog_suspend() and watchdog_resume() functions.

[akpm@linux-foundation.org: fix build with CONFIG_LOCKUP_DETECTOR=m]
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Stephane Eranian <eranian@google.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ulrich Obergfell 2015-09-04 15:45:25 -07:00 committed by Linus Torvalds
parent d4bdd0b21c
commit 999bbe49ea
3 changed files with 14 additions and 41 deletions
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7
arch/x86/kernel/cpu/perf_event_intel.c
View file

@ -3627,7 +3627,10 @@ static __init int fixup_ht_bug(void)
return 0;
}
watchdog_nmi_disable_all();
if (watchdog_suspend() != 0) {
pr_debug("failed to disable PMU erratum BJ122, BV98, HSD29 workaround\n");
return 0;
}
x86_pmu.flags &= ~(PMU_FL_EXCL_CNTRS | PMU_FL_EXCL_ENABLED);
@ -3635,7 +3638,7 @@ static __init int fixup_ht_bug(void)
x86_pmu.commit_scheduling = NULL;
x86_pmu.stop_scheduling = NULL;
watchdog_nmi_enable_all();
watchdog_resume();
get_online_cpus();

13
include/linux/nmi.h
View file

@ -26,12 +26,8 @@ static inline void touch_nmi_watchdog(void)
#if defined(CONFIG_HARDLOCKUP_DETECTOR)
extern void hardlockup_detector_disable(void);
void watchdog_nmi_disable_all(void);
void watchdog_nmi_enable_all(void);
#else
static inline void hardlockup_detector_disable(void) {}
static inline void watchdog_nmi_disable_all(void) {}
static inline void watchdog_nmi_enable_all(void) {}
#endif
/*
@ -84,6 +80,15 @@ extern int proc_watchdog_cpumask(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
extern int watchdog_suspend(void);
extern void watchdog_resume(void);
#else
static inline int watchdog_suspend(void)
{
return 0;
}
static inline void watchdog_resume(void)
{
}
#endif
#ifdef CONFIG_HAVE_ACPI_APEI_NMI

35
kernel/watchdog.c
View file

@ -615,41 +615,6 @@ static void watchdog_nmi_disable(unsigned int cpu)
}
}
void watchdog_nmi_enable_all(void)
{
int cpu;
mutex_lock(&watchdog_proc_mutex);
if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED))
goto unlock;
get_online_cpus();
for_each_watchdog_cpu(cpu)
watchdog_nmi_enable(cpu);
put_online_cpus();
unlock:
mutex_unlock(&watchdog_proc_mutex);
}
void watchdog_nmi_disable_all(void)
{
int cpu;
mutex_lock(&watchdog_proc_mutex);
if (!watchdog_running)
goto unlock;
get_online_cpus();
for_each_watchdog_cpu(cpu)
watchdog_nmi_disable(cpu);
put_online_cpus();
unlock:
mutex_unlock(&watchdog_proc_mutex);
}
#else
static int watchdog_nmi_enable(unsigned int cpu) { return 0; }
static void watchdog_nmi_disable(unsigned int cpu) { return; }