lkml.org 
[lkml]   [2013]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] perf: Add the rcu_read_lock to protect the list_for_each_entry_rcu.
From
Date

The list_for_each_entry_rcu should be guarded by rcu_read_lock().This patch add
rcu_read_lock to protect the list_for_each_entry_rcu.

Signed-off-by: Chen Jun <jun.d.chen@intel.com>
---
kernel/events/core.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 301079d..e2f2fa5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2442,6 +2442,7 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,

raw_spin_lock(&ctx->lock);
perf_pmu_disable(ctx->pmu);
+ rcu_read_lock();

list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->state != PERF_EVENT_STATE_ACTIVE)
@@ -2483,6 +2484,7 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0);
}

+ rcu_read_unlock();
perf_pmu_enable(ctx->pmu);
raw_spin_unlock(&ctx->lock);
}
--
1.7.4.1




\
 
 \ /
  Last update: 2013-01-28 07:01    [W:0.028 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site