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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2009-01-12 11:06:18 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-15 09:46:40 +0100 |
| commit | 6f3b34402e7282cde49dff395d7ea462bf33bf50 (patch) | |
| tree | 9f6b01f62bc6065614f3f70aaff11da7f516e383 /kernel/trace/trace.c | |
| parent | 428aee1460a75197f0190534b4d610450ee59af1 (diff) | |
| download | lwn-6f3b34402e7282cde49dff395d7ea462bf33bf50.tar.gz lwn-6f3b34402e7282cde49dff395d7ea462bf33bf50.zip | |
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.c')
0 files changed, 0 insertions, 0 deletions