[RFC PATCH] ARM: Flush L2 cache on soft_restart

[Taras Kondratiuk]

On 2 October 2013 15:49, Will Deacon <will.deacon at arm.com> wrote:
> On Wed, Oct 02, 2013 at 12:34:16PM +0100, Taras Kondratiuk wrote:
>> diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
>> index 94f6b05..e359b62 100644
>> --- a/arch/arm/kernel/process.c
>> +++ b/arch/arm/kernel/process.c
>> @@ -103,9 +103,11 @@ void soft_restart(unsigned long addr)
>>       local_irq_disable();
>>       local_fiq_disable();
>>
>> -     /* Disable the L2 if we're the last man standing. */
>> -     if (num_online_cpus() == 1)
>> +     /* Flush and disable the L2 if we're the last man standing. */
>> +     if (num_online_cpus() == 1) {
>> +             outer_flush_all();
>>               outer_disable();
>
> l2x0_disable already contains a flush, so this doesn't change anything.

Unfortunately not everybody uses l2x0_disable().
SoC's that use SMC calls for L2 cache maintenance have its own implementation
of outer_cache.disable which usually doesn't flush cache implicitly.

-- 
Regards,
Taras Kondratiuk