[PATCH] perf: Add the rcu_read_lock to protect the list_for_each_entry_rcu.
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 --- 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(>lock); perf_pmu_disable(ctx->pmu); + rcu_read_lock(); list_for_each_entry_rcu(event, >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(>lock); } -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] perf: Add the rcu_read_lock to protect the list_for_each_entry_rcu.
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.c...@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 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/