5 files changed, 15 insertions, 17 deletions

diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c
index 0691176899ff..aad63e611b36 100644
--- a/arch/arm/oprofile/common.c
+++ b/arch/arm/oprofile/common.c
@@ -96,7 +96,7 @@ static int op_create_counter(int cpu, int event)
                 return ret;
 
         pevent = perf_event_create_kernel_counter(&counter_config[event].attr,
-                                                  cpu, -1,
+                                                  cpu, NULL,
                                                   op_overflow_handler);
 
         if (IS_ERR(pevent)) {
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 93bf53aa50e5..39d8860b2684 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -902,7 +902,7 @@ extern int perf_event_release_kernel(struct perf_event *event);
 extern struct perf_event *
 perf_event_create_kernel_counter(struct perf_event_attr *attr,
                                 int cpu,
-                                pid_t pid,
+                                struct task_struct *task,
                                 perf_overflow_handler_t callback);
 extern u64 perf_event_read_value(struct perf_event *event,
                                  u64 *enabled, u64 *running);
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 6122f02cfedf..3b714e839c10 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -433,8 +433,7 @@ register_user_hw_breakpoint(struct perf_event_attr *attr,
                             perf_overflow_handler_t triggered,
                             struct task_struct *tsk)
 {
-        return perf_event_create_kernel_counter(attr, -1, task_pid_vnr(tsk),
-                                                triggered);
+        return perf_event_create_kernel_counter(attr, -1, tsk, triggered);
 }
 EXPORT_SYMBOL_GPL(register_user_hw_breakpoint);
 
@@ -516,7 +515,7 @@ register_wide_hw_breakpoint(struct perf_event_attr *attr,
         get_online_cpus();
         for_each_online_cpu(cpu) {
                 pevent = per_cpu_ptr(cpu_events, cpu);
-                bp = perf_event_create_kernel_counter(attr, cpu, -1, triggered);
+                bp = perf_event_create_kernel_counter(attr, cpu, NULL, triggered);
 
                 *pevent = bp;
 
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3f5309db72f1..86f394e15d53 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2053,15 +2053,14 @@ errout:
 }
 
 static struct perf_event_context *
-find_get_context(struct pmu *pmu, pid_t pid, int cpu)
+find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
 {
         struct perf_event_context *ctx;
         struct perf_cpu_context *cpuctx;
-        struct task_struct *task;
         unsigned long flags;
         int ctxn, err;
 
-        if (pid == -1 && cpu != -1) {
+        if (!task && cpu != -1) {
                 /* Must be root to operate on a CPU event: */
                 if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
                         return ERR_PTR(-EACCES);
@@ -2084,10 +2083,6 @@ find_get_context(struct pmu *pmu, pid_t pid, int cpu)
                 return ctx;
         }
 
-        task = find_lively_task_by_vpid(pid);
-        if (IS_ERR(task))
-                return (void*)task;
-
         err = -EINVAL;
         ctxn = pmu->task_ctx_nr;
         if (ctxn < 0)
@@ -5527,6 +5522,7 @@ SYSCALL_DEFINE5(perf_event_open,
         struct perf_event_context *ctx;
         struct file *event_file = NULL;
         struct file *group_file = NULL;
+        struct task_struct *task = NULL;
         struct pmu *pmu;
         int event_fd;
         int fput_needed = 0;
@@ -5581,10 +5577,13 @@ SYSCALL_DEFINE5(perf_event_open,
         if ((pmu->task_ctx_nr == perf_sw_context) && group_leader)
                 pmu = group_leader->pmu;
 
+        if (pid != -1)
+                task = find_lively_task_by_vpid(pid);
+
         /*
          * Get the target context (task or percpu):
          */
-        ctx = find_get_context(pmu, pid, cpu);
+        ctx = find_get_context(pmu, task, cpu);
         if (IS_ERR(ctx)) {
                 err = PTR_ERR(ctx);
                 goto err_group_fd;
@@ -5666,11 +5665,11 @@ err_fd:
  *
  * @attr: attributes of the counter to create
  * @cpu: cpu in which the counter is bound
- * @pid: task to profile
+ * @task: task to profile (NULL for percpu)
  */
 struct perf_event *
 perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
-                                 pid_t pid,
+                                 struct task_struct *task,
                                  perf_overflow_handler_t overflow_handler)
 {
         struct perf_event_context *ctx;
@@ -5687,7 +5686,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
                 goto err;
         }
 
-        ctx = find_get_context(event->pmu, pid, cpu);
+        ctx = find_get_context(event->pmu, task, cpu);
         if (IS_ERR(ctx)) {
                 err = PTR_ERR(ctx);
                 goto err_free;
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 89eadbb9cefe..dc8e16824b51 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -358,7 +358,7 @@ static int watchdog_nmi_enable(int cpu)
         /* Try to register using hardware perf events */
         wd_attr = &wd_hw_attr;
         wd_attr->sample_period = hw_nmi_get_sample_period();
-        event = perf_event_create_kernel_counter(wd_attr, cpu, -1, watchdog_overflow_callback);
+        event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback);
         if (!IS_ERR(event)) {
                 printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
                 goto out_save;