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| author | Ingo Molnar <mingo@kernel.org> | 2013-10-03 07:52:21 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-03 07:52:21 +0200 |
| commit | 6c09f6d830d03b78717403e7b42838a2ee2987ae (patch) | |
| tree | 6436ab6a237578406e004c891e134afd266fb95d /kernel/events/core.c | |
| parent | 389e067032fbb96e439abafae848dd447e4cafb4 (diff) | |
| parent | 15c03dd4859ab16f9212238f29dd315654aa94f6 (diff) | |
| download | blackbird-op-linux-6c09f6d830d03b78717403e7b42838a2ee2987ae.tar.gz blackbird-op-linux-6c09f6d830d03b78717403e7b42838a2ee2987ae.zip | |
Merge tag 'v3.12-rc3' into timers/core
Merge Linux 3.12-rc3 - refresh the tree with the latest fixes before merging new bits.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events/core.c')
| -rw-r--r-- | kernel/events/core.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index dd236b66ca3a..cb4238e85b38 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3660,6 +3660,26 @@ static void calc_timer_values(struct perf_event *event, *running = ctx_time - event->tstamp_running; } +static void perf_event_init_userpage(struct perf_event *event) +{ + struct perf_event_mmap_page *userpg; + struct ring_buffer *rb; + + rcu_read_lock(); + rb = rcu_dereference(event->rb); + if (!rb) + goto unlock; + + userpg = rb->user_page; + + /* Allow new userspace to detect that bit 0 is deprecated */ + userpg->cap_bit0_is_deprecated = 1; + userpg->size = offsetof(struct perf_event_mmap_page, __reserved); + +unlock: + rcu_read_unlock(); +} + void __weak arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) { } @@ -4044,6 +4064,7 @@ again: ring_buffer_attach(event, rb); rcu_assign_pointer(event->rb, rb); + perf_event_init_userpage(event); perf_event_update_userpage(event); unlock: |
