powerpc/kprobes: Disable preemption before invoking probe handler for optprobes

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Per Documentation/kprobes.txt, probe handlers need to be invoked with
preemption disabled. Update optimized_callback() to do so. Also move
get_kprobe_ctlblk() invocation post preemption disable, since it
accesses pre-cpu data.

This was not an issue so far since optprobes wasn't selected if
CONFIG_PREEMPT was enabled. Commit a30b85df7d ("kprobes: Use
synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT=y") changes
this.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

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Naveen N. Rao 2017-10-23 22:07:38 +05:30 • committed by Michael Ellerman

parent fc2a5a6161

commit 8a2d71a3f2

1 changed files with 3 additions and 2 deletions

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arch/powerpc/kernel/optprobes.c

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