ring-buffer: check for swapped buffers in start of committing

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Because the irqsoff tracer can swap an internal CPU buffer, it is possible
that a swap happens between the start of the write and before the committing
bit is set (the committing bit will disable swapping).

This patch adds a check for this and will fail the write if it detects it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt 2009-09-04 14:11:34 -04:00 • committed by Steven Rostedt

parent e8165dbb03

commit 62f0b3eb5c

1 changed files with 17 additions and 3 deletions

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kernel/trace/ring_buffer.c

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