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author | Ingo Molnar <mingo@elte.hu> | 2011-01-04 08:08:51 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-01-04 08:08:54 +0100 |
commit | cc2221969906a166a638aecdbae84a3d0462719e (patch) | |
tree | 2483f726e226c309207e1d0250660eea6e1787b8 /kernel/trace | |
parent | 56f4c400349157289b474a3fd49ee96acab0a4d7 (diff) | |
parent | 387c31c7e5c9805b0aef8833d1731a5fe7bdea14 (diff) | |
download | linux-stable-cc2221969906a166a638aecdbae84a3d0462719e.tar.gz linux-stable-cc2221969906a166a638aecdbae84a3d0462719e.tar.bz2 linux-stable-cc2221969906a166a638aecdbae84a3d0462719e.zip |
Merge commit 'v2.6.37-rc8' into perf/core
Merge reason: pick up latest -rc.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r-- | kernel/trace/ring_buffer.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 9ed509a015d8..bd1c35a4fbcc 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -3853,6 +3853,13 @@ int ring_buffer_read_page(struct ring_buffer *buffer, /* Need to copy one event at a time */ do { + /* We need the size of one event, because + * rb_advance_reader only advances by one event, + * whereas rb_event_ts_length may include the size of + * one or two events. + * We have already ensured there's enough space if this + * is a time extend. */ + size = rb_event_length(event); memcpy(bpage->data + pos, rpage->data + rpos, size); len -= size; @@ -3867,7 +3874,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer, event = rb_reader_event(cpu_buffer); /* Always keep the time extend and data together */ size = rb_event_ts_length(event); - } while (len > size); + } while (len >= size); /* update bpage */ local_set(&bpage->commit, pos); |