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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-06-11 17:32:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-09-09 20:46:29 +0200 |
| commit | 24cd7f54a0d47e1d5b3de29e2456bfbd2d8447b7 (patch) | |
| tree | a37d3a4cb101e3f67635a1920f447c9e9e8d8ab2 /arch/sh/kernel | |
| parent | 9ed6060d286b1eb55974d09080f442f809408c42 (diff) | |
| download | blackbird-op-linux-24cd7f54a0d47e1d5b3de29e2456bfbd2d8447b7.tar.gz blackbird-op-linux-24cd7f54a0d47e1d5b3de29e2456bfbd2d8447b7.zip | |
perf: Reduce perf_disable() usage
Since the current perf_disable() usage is only an optimization,
remove it for now. This eases the removal of the __weak
hw_perf_enable() interface.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
Cc: stephane eranian <eranian@googlemail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Yanmin <yanmin_zhang@linux.intel.com>
Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Michael Cree <mcree@orcon.net.nz>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | arch/sh/kernel/perf_event.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/sh/kernel/perf_event.c b/arch/sh/kernel/perf_event.c index 8cb206597e0c..d042989ceb45 100644 --- a/arch/sh/kernel/perf_event.c +++ b/arch/sh/kernel/perf_event.c @@ -230,11 +230,14 @@ static int sh_pmu_enable(struct perf_event *event) struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); struct hw_perf_event *hwc = &event->hw; int idx = hwc->idx; + int ret = -EAGAIN; + + perf_disable(); if (test_and_set_bit(idx, cpuc->used_mask)) { idx = find_first_zero_bit(cpuc->used_mask, sh_pmu->num_events); if (idx == sh_pmu->num_events) - return -EAGAIN; + goto out; set_bit(idx, cpuc->used_mask); hwc->idx = idx; @@ -248,8 +251,10 @@ static int sh_pmu_enable(struct perf_event *event) sh_pmu->enable(hwc, idx); perf_event_update_userpage(event); - - return 0; + ret = 0; +out: + perf_enable(); + return ret; } static void sh_pmu_read(struct perf_event *event) |
