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| author |   Steven Rostedt <srostedt@redhat.com> | 2009-06-16 21:22:48 -0400 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2009-06-17 14:16:27 -0400 |
| commit | 8d707e8eb4de4b930573155ab4df4b3270ee25dd (patch) | |
| tree | 2594b38c73fa1c944587f62a2f9ce70fe4f90ce4 /lib/fault-inject.c | |
| parent | ring-buffer: add locks around rb_per_cpu_empty (diff) | |
| download | wireguard-linux-8d707e8eb4de4b930573155ab4df4b3270ee25dd.tar.xz wireguard-linux-8d707e8eb4de4b930573155ab4df4b3270ee25dd.zip | |
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 'lib/fault-inject.c')
0 files changed, 0 insertions, 0 deletions