diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-05-13 08:12:51 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-13 08:17:37 +0200 |
| commit | 5bb9efe33ea4001a17ab98186a40a134a3061d67 (patch) | |
| tree | ecb30329fd190d6db4b8e9c08d42a8d2e6c1e54d /arch/x86 | |
| parent | e758a33d6fc5b9d6a3ae489863d04fcecad8120b (diff) | |
perf_counter: fix print debug irq disable
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
bash/15802 [HC0[0]:SC0[0]:HE1:SE1] takes:
(sysrq_key_table_lock){?.....},
Don't unconditionally enable interrupts in the perf_counter_print_debug()
path.
[ Impact: fix potential deadlock pointed out by lockdep ]
LKML-Reference: <new-submission>
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_counter.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index da27419923a..f7772ff7936 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -621,12 +621,13 @@ void perf_counter_print_debug(void) { u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed; struct cpu_hw_counters *cpuc; + unsigned long flags; int cpu, idx; if (!x86_pmu.num_counters) return; - local_irq_disable(); + local_irq_save(flags); cpu = smp_processor_id(); cpuc = &per_cpu(cpu_hw_counters, cpu); @@ -664,7 +665,7 @@ void perf_counter_print_debug(void) pr_info("CPU#%d: fixed-PMC%d count: %016llx\n", cpu, idx, pmc_count); } - local_irq_enable(); + local_irq_restore(flags); } static void x86_pmu_disable(struct perf_counter *counter) |