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lib: spinlock: Trigger a watchdog bite on spin_dump for rwlock

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Currently dump_stack is printed once a spin_bug is detected for rwlock.
So provide an options to trigger a panic or watchdog bite for debugging
rwlock magic corruptions and lockups.

Change-Id: I20807e8eceb8b81635e58701d1f9f9bd36ab5877
[abhimany: replace msm with qcom]
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
This commit is contained in:
Prasad Sodagudi 2015-04-11 06:06:26 +05:30 • committed by David Keitel
parent 77d758e283
commit 805c18d71c
3 changed files with 7 additions and 2 deletions
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2
include/soc/qcom/watchdog.h
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@ -20,7 +20,7 @@
#define WDOG_BITE_ON_PANIC 0 #define WDOG_BITE_ON_PANIC 0
#endif #endif
#ifdef CONFIG_MSM_WATCHDOG_V2 #ifdef CONFIG_QCOM_WATCHDOG_V2
void msm_trigger_wdog_bite(void); void msm_trigger_wdog_bite(void);
#else #else
static inline void msm_trigger_wdog_bite(void) { } static inline void msm_trigger_wdog_bite(void) { }

5
kernel/locking/spinlock_debug.c
View file

@ -174,6 +174,11 @@ static void rwlock_bug(rwlock_t *lock, const char *msg)
printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n", printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
msg, raw_smp_processor_id(), current->comm, msg, raw_smp_processor_id(), current->comm,
task_pid_nr(current), lock); task_pid_nr(current), lock);
#ifdef CONFIG_DEBUG_SPINLOCK_BITE_ON_BUG
msm_trigger_wdog_bite();
#elif defined(CONFIG_DEBUG_SPINLOCK_PANIC_ON_BUG)
BUG();
#endif
dump_stack(); dump_stack();
} }

2
lib/Kconfig.debug
View file

@ -968,7 +968,7 @@ config DEBUG_SPINLOCK
config DEBUG_SPINLOCK_BITE_ON_BUG config DEBUG_SPINLOCK_BITE_ON_BUG
bool "Cause a Watchdog Bite on Spinlock bug" bool "Cause a Watchdog Bite on Spinlock bug"
depends on DEBUG_SPINLOCK && !DEBUG_SPINLOCK_PANIC_ON_BUG && MSM_WATCHDOG_V2 depends on DEBUG_SPINLOCK && !DEBUG_SPINLOCK_PANIC_ON_BUG && QCOM_WATCHDOG_V2
help help
On a spinlock bug, cause a watchdog bite so that we can get the precise On a spinlock bug, cause a watchdog bite so that we can get the precise
state of the system captured at the time of spin dump. This is mutually state of the system captured at the time of spin dump. This is mutually