From: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Date: Wed, 7 May 2014 14:18:36 +0000 (-0400)
Subject: ARM: Check if a CPU has gone offline
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~8^2~28^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c814ca029e1015bb0ecec312f4bb9751ba1a711a;p=pandora-kernel.git

ARM: Check if a CPU has gone offline

PSCIv0.2 adds a new function called AFFINITY_INFO, which
can be used to query if a specified CPU has actually gone
offline. Calling this function via cpu_kill ensures that
a CPU has quiesced after a call to cpu_die. This helps
prevent the CPU from doing arbitrary bad things when data
or instructions are clobbered (as happens with kexec)
in the window between a CPU announcing that it is dead
and said CPU leaving the kernel.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---

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