Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

[pandora-kernel.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 4ec55ef..126a302 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5380,6 +5380,8 @@ free_dev:
        goto out;
 }
 
+static struct lock_class_key cpuctx_mutex;
+
 int perf_pmu_register(struct pmu *pmu, char *name, int type)
 {
        int cpu, ret;
@@ -5428,6 +5430,7 @@ skip_type:
 
                cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
                __perf_event_init_context(&cpuctx->ctx);
+               lockdep_set_class(&cpuctx->ctx.mutex, &cpuctx_mutex);
                cpuctx->ctx.type = cpu_context;
                cpuctx->ctx.pmu = pmu;
                cpuctx->jiffies_interval = 1;
@@ -6133,7 +6136,7 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
         * scheduled, so we are now safe from rescheduling changing
         * our context.
         */
-       child_ctx = rcu_dereference(child->perf_event_ctxp[ctxn]);
+       child_ctx = rcu_dereference_raw(child->perf_event_ctxp[ctxn]);
        task_ctx_sched_out(child_ctx, EVENT_ALL);
 
        /*
@@ -6446,11 +6449,6 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
        unsigned long flags;
        int ret = 0;
 
-       child->perf_event_ctxp[ctxn] = NULL;
-
-       mutex_init(&child->perf_event_mutex);
-       INIT_LIST_HEAD(&child->perf_event_list);
-
        if (likely(!parent->perf_event_ctxp[ctxn]))
                return 0;
 
@@ -6539,6 +6537,10 @@ int perf_event_init_task(struct task_struct *child)
 {
        int ctxn, ret;
 
+       memset(child->perf_event_ctxp, 0, sizeof(child->perf_event_ctxp));
+       mutex_init(&child->perf_event_mutex);
+       INIT_LIST_HEAD(&child->perf_event_list);
+
        for_each_task_context_nr(ctxn) {
                ret = perf_event_init_context(child, ctxn);
                if (ret)