Re: [PATCH 8/9] ARM: kernel: add support for cpu cache information

[Stephen Boyd]

On 06/26/14 04:36, Sudeep Holla wrote:
> Hi Stephen,
>
> On 26/06/14 01:19, Stephen Boyd wrote:
>> On 06/25/14 10:30, Sudeep Holla wrote:
>>> +
>>> +/*
>>> + * Which cache CCSIDR represents depends on CSSELR value
>>> + * Make sure no one else changes CSSELR during this
>>> + * smp_call_function_single prevents preemption for us
>>> + */
>>
>> Where's the smp_call_function_single() or preemption disable happening?
>>
>
> init_cache_level is called using smp_call_function_single in
> drivers/base/cacheinfo.c(PATCH 2/9)

Oh that's unexpected. Do other architectures require the use of
smp_call_function_single() to read their cache information? It seems
like an ARM architecture specific detail that has been pushed up into
the generic layer.

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