linux-kernel - Re: [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU

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Message-ID: <20160721150219.GD16666@e104818-lin.cambridge.arm.com>
Date:	Thu, 21 Jul 2016 16:02:20 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Suzuki K Poulose <suzuki.poulose@....com>
Cc:	mark.rutland@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: Fix incorrect per-cpu usage for boot CPU

On Thu, Jul 21, 2016 at 11:12:55AM +0100, Suzuki K. Poulose wrote:
> In smp_prepare_boot_cpu(), we invoke cpuinfo_store_boot_cpu to  store
> the cpuinfo in a per-cpu ptr, before initialising the per-cpu offset for
> the boot CPU. This patch reorders the sequence to make sure we initialise
> the per-cpu offset before accessing the per-cpu area.
> 
> Commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu") fixed the
> issue where we modified the per-cpu area even before the kernel initialises
> the per-cpu areas, but failed to wait until the boot cpu updated it's
> offset.
> 
> Fixes: commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu")
> Cc: <stable@...r.kernel.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

Applied. Thanks.

-- 
Catalin