loops_per_jiffy is larger than expectation that possible
causes one thread can not obtain the spin lock for a long time.
So use cpu_clock() to reach timeout in one second which can
avoid HARD LOCKUP.
Signed-off-by: Chuansheng Liu <chuansheng....@intel.com>
Signed-off-by: xiaoming wang <xiaoming.w...@intel.com>
---
kernel/locking/spinlock_debug.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/kernel/locking/spinlock_debug.c b/kernel/locking/spinlock_debug.c
index 0374a59..5d3c4f3 100644
--- a/kernel/locking/spinlock_debug.c
+++ b/kernel/locking/spinlock_debug.c
@@ -105,13 +105,19 @@ static inline void debug_spin_unlock(raw_spinlock_t *lock)
static void __spin_lock_debug(raw_spinlock_t *lock)
{
- u64 i;
+ u64 i, t;
u64 loops = loops_per_jiffy * HZ;
+ u64 one_second = 1000000000;
+ u32 this_cpu = raw_smp_processor_id();
+
+ t = cpu_clock(this_cpu);
for (i = 0; i < loops; i++) {
if (arch_spin_trylock(&lock->raw_lock))
return;
__delay(1);
+ if (cpu_clock(this_cpu) - t > one_second)
+ break;
}
/* lockup suspected: */
spin_dump(lock, "lockup suspected");
--
1.7.1
--
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