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| author | Ingo Molnar <mingo@kernel.org> | 2016-02-18 09:28:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-18 09:28:03 +0100 |
| commit | 3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5 (patch) | |
| tree | 294c2f340b11584e58cea90adfc4182ac8742348 /lib/dump_stack.c | |
| parent | 4e79e182b419172e35936a47f098509092d69817 (diff) | |
| parent | f4eafd8bcd5229e998aa252627703b8462c3b90f (diff) | |
| download | lwn-3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5.tar.gz lwn-3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5.zip | |
Merge branch 'x86/urgent' into x86/asm, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/dump_stack.c')
| -rw-r--r-- | lib/dump_stack.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/dump_stack.c b/lib/dump_stack.c index 6745c6230db3..c30d07e99dba 100644 --- a/lib/dump_stack.c +++ b/lib/dump_stack.c @@ -25,6 +25,7 @@ static atomic_t dump_lock = ATOMIC_INIT(-1); asmlinkage __visible void dump_stack(void) { + unsigned long flags; int was_locked; int old; int cpu; @@ -33,9 +34,8 @@ asmlinkage __visible void dump_stack(void) * Permit this cpu to perform nested stack dumps while serialising * against other CPUs */ - preempt_disable(); - retry: + local_irq_save(flags); cpu = smp_processor_id(); old = atomic_cmpxchg(&dump_lock, -1, cpu); if (old == -1) { @@ -43,6 +43,7 @@ retry: } else if (old == cpu) { was_locked = 1; } else { + local_irq_restore(flags); cpu_relax(); goto retry; } @@ -52,7 +53,7 @@ retry: if (!was_locked) atomic_set(&dump_lock, -1); - preempt_enable(); + local_irq_restore(flags); } #else asmlinkage __visible void dump_stack(void) |