perf_counter: fix warning & lockup

 - remove bogus warning
 - fix wakeup from NMI path lockup
 - also fix up whitespace noise in perf_counter.h

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090525153931.703093461@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e3a7585..2b16ed3 100644 (file)
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -73,7 +73,7 @@ enum sw_event_ids {
        PERF_SW_EVENTS_MAX              = 7,
 };
 
-#define __PERF_COUNTER_MASK(name)                      \
+#define __PERF_COUNTER_MASK(name)                      \
        (((1ULL << PERF_COUNTER_##name##_BITS) - 1) <<  \
         PERF_COUNTER_##name##_SHIFT)
 
@@ -98,14 +98,14 @@ enum sw_event_ids {
  * in the overflow packets.
  */
 enum perf_counter_record_format {
-       PERF_RECORD_IP          = 1U << 0,
-       PERF_RECORD_TID         = 1U << 1,
-       PERF_RECORD_TIME        = 1U << 2,
-       PERF_RECORD_ADDR        = 1U << 3,
-       PERF_RECORD_GROUP       = 1U << 4,
-       PERF_RECORD_CALLCHAIN   = 1U << 5,
-       PERF_RECORD_CONFIG      = 1U << 6,
-       PERF_RECORD_CPU         = 1U << 7,
+       PERF_RECORD_IP                  = 1U << 0,
+       PERF_RECORD_TID                 = 1U << 1,
+       PERF_RECORD_TIME                = 1U << 2,
+       PERF_RECORD_ADDR                = 1U << 3,
+       PERF_RECORD_GROUP               = 1U << 4,
+       PERF_RECORD_CALLCHAIN           = 1U << 5,
+       PERF_RECORD_CONFIG              = 1U << 6,
+       PERF_RECORD_CPU                 = 1U << 7,
 };
 
 /*
@@ -235,13 +235,13 @@ enum perf_event_type {
         * correlate userspace IPs to code. They have the following structure:
         *
         * struct {
-        *      struct perf_event_header        header;
+        *      struct perf_event_header        header;
         *
-        *      u32                             pid, tid;
-        *      u64                             addr;
-        *      u64                             len;
-        *      u64                             pgoff;
-        *      char                            filename[];
+        *      u32                             pid, tid;
+        *      u64                             addr;
+        *      u64                             len;
+        *      u64                             pgoff;
+        *      char                            filename[];
         * };
         */
        PERF_EVENT_MMAP                 = 1,
@@ -249,27 +249,27 @@ enum perf_event_type {
 
        /*
         * struct {
-        *      struct perf_event_header        header;
+        *      struct perf_event_header        header;
         *
-        *      u32                             pid, tid;
-        *      char                            comm[];
+        *      u32                             pid, tid;
+        *      char                            comm[];
         * };
         */
        PERF_EVENT_COMM                 = 3,
 
        /*
         * struct {
-        *      struct perf_event_header        header;
-        *      u64                             time;
-        *      u64                             irq_period;
+        *      struct perf_event_header        header;
+        *      u64                             time;
+        *      u64                             irq_period;
         * };
         */
        PERF_EVENT_PERIOD               = 4,
 
        /*
         * struct {
-        *      struct perf_event_header        header;
-        *      u64                             time;
+        *      struct perf_event_header        header;
+        *      u64                             time;
         * };
         */
        PERF_EVENT_THROTTLE             = 5,
@@ -280,23 +280,23 @@ enum perf_event_type {
         * will be PERF_RECORD_*
         *
         * struct {
-        *      struct perf_event_header        header;
+        *      struct perf_event_header        header;
         *
-        *      { u64                   ip;       } && PERF_RECORD_IP
-        *      { u32                   pid, tid; } && PERF_RECORD_TID
-        *      { u64                   time;     } && PERF_RECORD_TIME
-        *      { u64                   addr;     } && PERF_RECORD_ADDR
-        *      { u64                   config;   } && PERF_RECORD_CONFIG
-        *      { u32                   cpu, res; } && PERF_RECORD_CPU
+        *      { u64                   ip;       } && PERF_RECORD_IP
+        *      { u32                   pid, tid; } && PERF_RECORD_TID
+        *      { u64                   time;     } && PERF_RECORD_TIME
+        *      { u64                   addr;     } && PERF_RECORD_ADDR
+        *      { u64                   config;   } && PERF_RECORD_CONFIG
+        *      { u32                   cpu, res; } && PERF_RECORD_CPU
         *
-        *      { u64                   nr;
-        *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP
+        *      { u64                   nr;
+        *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP
         *
-        *      { u16                   nr,
-        *                              hv,
-        *                              kernel,
-        *                              user;
-        *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
+        *      { u16                   nr,
+        *                              hv,
+        *                              kernel,
+        *                              user;
+        *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
         * };
         */
 };
@@ -406,7 +406,7 @@ struct perf_mmap_data {
        atomic_t                        wakeup;         /* needs a wakeup    */
 
        struct perf_counter_mmap_page   *user_page;
-       void                            *data_pages[0];
+       void                            *data_pages[0];
 };
 
 struct perf_pending_entry {
@@ -422,7 +422,7 @@ struct perf_counter {
        struct list_head                list_entry;
        struct list_head                event_entry;
        struct list_head                sibling_list;
-       int                             nr_siblings;
+       int                             nr_siblings;
        struct perf_counter             *group_leader;
        const struct pmu                *pmu;
 

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index ec9c400..070f92d 100644 (file)
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2576,7 +2576,7 @@ static void perf_log_throttle(struct perf_counter *counter, int enable)
                .time = sched_clock(),
        };
 
-       ret = perf_output_begin(&handle, counter, sizeof(throttle_event), 0, 0);
+       ret = perf_output_begin(&handle, counter, sizeof(throttle_event), 1, 0);
        if (ret)
                return;
 
@@ -3449,8 +3449,6 @@ void perf_counter_exit_task(struct task_struct *child)
        struct perf_counter_context *child_ctx;
        unsigned long flags;
 
-       WARN_ON_ONCE(child != current);
-
        child_ctx = child->perf_counter_ctxp;
 
        if (likely(!child_ctx))