Re: [PATCH 3/8] jump_label: introduce DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros

From	Kevin Hao <haokexin@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/8] jump_label: introduce DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros
Date	2015-08-21 05:30 +0200
Message-ID	<pZLbI-8j2-1@gated-at.bofh.it> (permalink)
References	<pZwZ4-4Ab-17@gated-at.bofh.it> <pZwZ6-4Ab-53@gated-at.bofh.it> <pZCUN-4Dv-15@gated-at.bofh.it>
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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

Thread

[PATCH 0/8] powerpc: use jump label for {cpu,mmu}_has_feature() Kevin Hao <haokexin@gmail.com> - 2015-08-20 14:20 +0200
  [PATCH 8/8] powerpc: use jump label for mmu_has_feature Kevin Hao <haokexin@gmail.com> - 2015-08-20 14:20 +0200
  [PATCH 7/8] powerpc: use the jump label for cpu_has_feature Kevin Hao <haokexin@gmail.com> - 2015-08-20 14:20 +0200
  [PATCH 3/8] jump_label: introduce DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Kevin Hao <haokexin@gmail.com> - 2015-08-20 14:20 +0200
    Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Peter Zijlstra <peterz@infradead.org> - 2015-08-20 20:40 +0200
      Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Kevin Hao <haokexin@gmail.com> - 2015-08-21 05:30 +0200
    Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Ingo Molnar <mingo@kernel.org> - 2015-08-21 08:30 +0200
      Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Kevin Hao <haokexin@gmail.com> - 2015-08-21 08:40 +0200
        Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Kevin Hao <haokexin@gmail.com> - 2015-08-21 08:50 +0200
        Re: [PATCH 3/8] jump_label: introduce  DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros Ingo Molnar <mingo@kernel.org> - 2015-08-21 08:50 +0200

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