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| author |   Huacai Chen <chenhc@lemote.com> | 2015-06-04 14:53:47 +0800 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2015-06-06 10:21:10 +0200 |
| commit | e1fb96e064e7157920f043f40ae801a5c18e57da (patch) | |
| tree | 86df4259ada205a7cf700ca0ed3a70486e262697 | |
| parent | MIPS: Fix enabling of DEBUG_STACKOVERFLOW (diff) | |
| download | linux-dev-e1fb96e064e7157920f043f40ae801a5c18e57da.tar.xz linux-dev-e1fb96e064e7157920f043f40ae801a5c18e57da.zip | |
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>
| -rw-r--r-- | arch/mips/loongson/loongson-3/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/loongson/loongson-3/smp.c b/arch/mips/loongson/loongson-3/smp.c index e3c68b5da18d..509877c6e9d9 100644 --- a/arch/mips/loongson/loongson-3/smp.c +++ b/arch/mips/loongson/loongson-3/smp.c @@ -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; } } |