On Sat, Apr 15, 2017 at 07:01:23PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bige...@linutronix.de>
>
> If intel_snb_check_microcode() is invoked via
> microcode_init -> perf_check_microcode -> intel_snb_check_microcode
>
> then get_online_cpus() is invoked nested. This works with the current
> implementation of get_online_cpus() but prevents converting it to a percpu
> rwsem.
>
> intel_snb_check_microcode() is also invoked from intel_sandybridge_quirk()
> unprotected.
>
> Drop get_online_cpus() from intel_snb_check_microcode() and add it to
> intel_sandybridge_quirk() so both call sites are protected.
>
> Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
> Signed-off-by: Thomas Gleixner <t...@linutronix.de>
> Cc: Peter Zijlstra <pet...@infradead.org>
> Cc: Borislav Petkov <b...@alien8.de>
> Cc: x...@kernel.org
Acked-by: Borislav Petkov <b...@suse.de>
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
