tree 75ff2a914c476700b4a2272c523416d7d4cb3328
parent e1cd3b361a4f1dd323252543f40d43509d80affa
author Ashwin Chaugule <ashwin.chaugule@linaro.org> 1399472316 -0400
committer Ashwin Chaugule <ashwin.chaugule@linaro.org> 1400163390 -0400

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>