From: Huacai Chen <chenhc@lemote.com>
Date: Thu, 4 Jun 2015 06:53:47 +0000 (+0800)
Subject: MIPS: Loongson-3: Fix a cpu-hotplug issue in loongson3_ipi_interrupt()
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~249^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e1fb96e064e7157920f043f40ae801a5c18e57da;p=pandora-kernel.git

MIPS: Loongson-3: Fix a cpu-hotplug issue in loongson3_ipi_interrupt()

setup_per_cpu_areas() only setup __per_cpu_offset[] for each possible
cpu, but loongson_sysconf.nr_cpus can be greater than possible cpus
(due to reserved_cpus_mask). So in loongson3_ipi_interrupt(), percpu
access will touch the original varible in .data..percpu section which
has been freed. Without this patch, cpu-hotplug will cause memery
corruption.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/10524/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

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