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| author | Steven Rostedt <srostedt@redhat.com> | 2009-06-17 05:22:48 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-06-17 22:16:27 +0400 |
| commit | 8d707e8eb4de4b930573155ab4df4b3270ee25dd (patch) | |
| tree | 2594b38c73fa1c944587f62a2f9ce70fe4f90ce4 /kernel/trace/ring_buffer_benchmark.c | |
| parent | d47882078f05c2cb46b85f1e12a58ed9315b9d63 (diff) | |
| download | linux-8d707e8eb4de4b930573155ab4df4b3270ee25dd.tar.xz | |
ring-buffer: do not grab locks in nmi
If ftrace_dump_on_oops is set, and an NMI detects a lockup, then it
will need to read from the ring buffer. But the read side of the
ring buffer still takes locks. This patch adds a check on the read
side that if it is in an NMI, then it will disable the ring buffer
and not take any locks.
Reads can still happen on a disabled ring buffer.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer_benchmark.c')
0 files changed, 0 insertions, 0 deletions