Re: [Linaro-acpi] [PATCH v10 3/3] ARM: Check if a CPU has gone offline

On Thu, May 15, 2014 at 05:11:30AM +0100, Ashwin Chaugule wrote:

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