diff options
| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2009-01-12 11:06:18 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-21 15:21:30 +0100 |
| commit | 551b4048b3d4acf15aff9fe4aed89b892c135b02 (patch) | |
| tree | 5d8abe8ac236420a36164c24f98c840e89247e02 /kernel/trace/trace_mmiotrace.c | |
| parent | 00f57f545afa422db3003b0d0b30a30f8de7ecb2 (diff) | |
ring_buffer: reset write when reserve buffer fail
Impact: reset struct buffer_page.write when interrupt storm
if struct buffer_page.write is not reset, any succedent committing
will corrupted ring_buffer:
static inline void
rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
{
......
cpu_buffer->commit_page->commit =
cpu_buffer->commit_page->write;
......
}
when "if (RB_WARN_ON(cpu_buffer, next_page == reader_page))", ring_buffer
is disabled, but some reserved buffers may haven't been committed.
we need reset struct buffer_page.write.
when "if (unlikely(next_page == cpu_buffer->commit_page))", ring_buffer
is still available, we should not corrupt it.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_mmiotrace.c')
0 files changed, 0 insertions, 0 deletions