ring-buffer: do not grab locks in nmi

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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>

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Steven Rostedt 2009-06-16 21:22:48 -04:00 • committed by Steven Rostedt

parent d47882078f

commit 8d707e8eb4

1 changed files with 51 additions and 8 deletions

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kernel/trace/ring_buffer.c

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