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authorRobert Richter <robert.richter@amd.com>2012-04-02 20:19:08 +0200
committerIngo Molnar <mingo@kernel.org>2012-05-09 15:23:12 +0200
commitfd0d000b2c34aa43d4e92dcf0dfaeda7e123008a (patch)
tree8b81831cf37f1be6dd3cc9be772952d5c835a550 /arch/alpha
parentc75841a398d667d9968245b9519d93cedbfb4780 (diff)
downloadlinux-linaro-stable-fd0d000b2c34aa43d4e92dcf0dfaeda7e123008a.tar.gz
perf: Pass last sampling period to perf_sample_data_init()
We always need to pass the last sample period to perf_sample_data_init(), otherwise the event distribution will be wrong. Thus, modifiyng the function interface with the required period as argument. So basically a pattern like this: perf_sample_data_init(&data, ~0ULL); data.period = event->hw.last_period; will now be like that: perf_sample_data_init(&data, ~0ULL, event->hw.last_period); Avoids unininitialized data.period and simplifies code. Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1333390758-10893-3-git-send-email-robert.richter@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/kernel/perf_event.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c
index 0dae252f7a33..d821b17047e0 100644
--- a/arch/alpha/kernel/perf_event.c
+++ b/arch/alpha/kernel/perf_event.c
@@ -824,7 +824,6 @@ static void alpha_perf_event_irq_handler(unsigned long la_ptr,
idx = la_ptr;
- perf_sample_data_init(&data, 0);
for (j = 0; j < cpuc->n_events; j++) {
if (cpuc->current_idx[j] == idx)
break;
@@ -848,7 +847,7 @@ static void alpha_perf_event_irq_handler(unsigned long la_ptr,
hwc = &event->hw;
alpha_perf_event_update(event, hwc, idx, alpha_pmu->pmc_max_period[idx]+1);
- data.period = event->hw.last_period;
+ perf_sample_data_init(&data, 0, hwc->last_period);
if (alpha_perf_event_set_period(event, hwc, idx)) {
if (perf_event_overflow(event, &data, regs)) {