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

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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>
This commit is contained in:
Huacai Chen 2015-06-04 14:53:47 +08:00 committed by Ralf Baechle
parent 5f35b9cd55
commit e1fb96e064
1 changed files with 1 additions and 1 deletions
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arch/mips/loongson/loongson-3/smp.c
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@ -272,7 +272,7 @@ void loongson3_ipi_interrupt(struct pt_regs *regs)
if (action & SMP_ASK_C0COUNT) {
BUG_ON(cpu != 0);
c0count = read_c0_count();
for (i = 1; i < loongson_sysconf.nr_cpus; i++)
for (i = 1; i < num_possible_cpus(); i++)
per_cpu(core0_c0count, i) = c0count;
}
}