[PATCH] arm64: initialize spinlock for init_mm's context

[Leo Yan]

On 04/16/2014 04:15 PM, Will Deacon wrote:
> On Tue, Apr 15, 2014 at 09:20:50AM +0100, Leo Yan wrote:
>> ARM64 has defined the spinlock for init_mm's context, so need initialize
>> the spinlock structure; otherwise during the suspend flow it will dump
>> the info for spinlock's bad magic warning as below:
>>
>> [   39.084394] Disabling non-boot CPUs ...
>> [   39.092871] BUG: spinlock bad magic on CPU#1, swapper/1/0
>> [   39.092896]  lock: init_mm+0x338/0x3e0, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
>> [   39.092907] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G           O 3.10.33 #125
>> [   39.092912] Call trace:
>> [   39.092927] [<ffffffc000087e64>] dump_backtrace+0x0/0x16c
>> [   39.092934] [<ffffffc000087fe0>] show_stack+0x10/0x1c
>> [   39.092947] [<ffffffc000765334>] dump_stack+0x1c/0x28
>> [   39.092953] [<ffffffc0007653b8>] spin_dump+0x78/0x88
>> [   39.092960] [<ffffffc0007653ec>] spin_bug+0x24/0x34
>> [   39.092971] [<ffffffc000300a28>] do_raw_spin_lock+0x98/0x17c
>> [   39.092979] [<ffffffc00076cf08>] _raw_spin_lock_irqsave+0x4c/0x60
>> [   39.092990] [<ffffffc000094044>] set_mm_context+0x1c/0x6c
>> [   39.092996] [<ffffffc0000941c8>] __new_context+0x94/0x10c
>> [   39.093007] [<ffffffc0000d63d4>] idle_task_exit+0x104/0x1b0
>> [   39.093014] [<ffffffc00008d91c>] cpu_die+0x14/0x74
>> [   39.093021] [<ffffffc000084f74>] arch_cpu_idle_dead+0x8/0x14
>> [   39.093030] [<ffffffc0000e7f18>] cpu_startup_entry+0x1ec/0x258
>> [   39.093036] [<ffffffc00008d810>] secondary_start_kernel+0x114/0x124
>>
>> Signed-off-by: Leo Yan <leoy at marvell.com>
>> ---
>>   arch/arm64/include/asm/mmu.h |    3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
>> index f600d40..06a19bd 100644
>> --- a/arch/arm64/include/asm/mmu.h
>> +++ b/arch/arm64/include/asm/mmu.h
>> @@ -22,6 +22,9 @@ typedef struct {
>>   	void *vdso;
>>   } mm_context_t;
>>
>> +#define INIT_MM_CONTEXT(name) \
>> +	.context.id_lock = __RAW_SPIN_LOCK_INITIALIZER(name.context.id_lock),
>
> This should probably be __RAW_SPIN_LOCK_UNLOCKED instead.
>

Thanks for reviewing, pls see v2's patch.

Thx,
Leo Yan