ring-buffer: Move disabled check into preempt disable section

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The ring buffer resizing and resetting relies on a schedule RCU
action. The buffers are disabled, a synchronize_sched() is called
and then the resize or reset takes place.

But this only works if the disabling of the buffers are within the
preempt disabled section, otherwise a window exists that the buffers
can be written to while a reset or resize takes place.

Cc: stable@kernel.org
Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4B949E43.2010906@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

...

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Lai Jiangshan 2010-03-08 14:50:43 +08:00 • committed by Steven Rostedt

parent 915a0b575f

commit 52fbe9cde7

1 changed files with 6 additions and 6 deletions

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kernel/trace/ring_buffer.c

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