On Thu, Aug 20, 2015 at 08:31:58PM +0200, Peter Zijlstra wrote:
> On Thu, Aug 20, 2015 at 08:14:31PM +0800, Kevin Hao wrote:
> > These are used to define a static_key_{true,false} array.
>
> Yes but why...
>
> there might have been some clue in the patches you didn't send me, but
> since you didn't send them, I'm left wondering.
Sorry for the confusion. In order to use jump label for the
{cpu,mmu}_has_feature() functions on powerpc, we need to declare an array of
32 or 64 static_key_true (one static_key_true for each cpu or mmu feature).
The following are the two patches which depends on this patch.
https://lkml.org/lkml/2015/8/20/355
https://lkml.org/lkml/2015/8/20/356
So far only DEFINE_STATIC_KEY_TRUE_ARRAY macro is used, but I think it may seem
canonical to define the macros for both true or false keys at the same time.
Thanks,
Kevin
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