linux-kernel - Re: [PATCH 3/8] jump_label: introduce DEFINE_STATIC_KEY_{TRUE,FALSE}

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Date:	Fri, 21 Aug 2015 08:40:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Kevin Hao <haokexin@...il.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 3/8] jump_label: introduce
 DEFINE_STATIC_KEY_{TRUE,FALSE}_ARRAY macros


* Kevin Hao <haokexin@...il.com> wrote:

> On Fri, Aug 21, 2015 at 08:28:26AM +0200, Ingo Molnar wrote:
> > 
> > * Kevin Hao <haokexin@...il.com> wrote:
> > 
> > > These are used to define a static_key_{true,false} array.
> > > 
> > > Signed-off-by: Kevin Hao <haokexin@...il.com>
> > > ---
> > >  include/linux/jump_label.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> > > index 7f653e8f6690..5c1d6a49dd6b 100644
> > > --- a/include/linux/jump_label.h
> > > +++ b/include/linux/jump_label.h
> > > @@ -267,6 +267,12 @@ struct static_key_false {
> > >  #define DEFINE_STATIC_KEY_FALSE(name)	\
> > >  	struct static_key_false name = STATIC_KEY_FALSE_INIT
> > >  
> > > +#define DEFINE_STATIC_KEY_TRUE_ARRAY(name, n)	\
> > > +	struct static_key_true name[n] = { [0 ... n - 1] = STATIC_KEY_TRUE_INIT }
> > > +
> > > +#define DEFINE_STATIC_KEY_FALSE_ARRAY(name, n)	\
> > > +	struct static_key_false name[n] = { [0 ... n - 1] = STATIC_KEY_FALSE_INIT }
> > 
> > I think the define makes the code more obfuscated and less clear, the open-coded 
> > initialization is pretty dense and easy to read to begin with.
> 
> OK, I will drop this patch and move the initialization of the array to the 
> corresponding patch.

Please also Cc: peterz and me to the next submission of the series - static key 
(and jump label) changes go through the locking tree normally, and there's a 
number of changes pending already for v4.3:

20f9ed1568c0 locking/static_keys: Make verify_keys() static
412758cb2670 jump label, locking/static_keys: Update docs
2bf9e0ab08c6 locking/static_keys: Provide a selftest
ed79e946732e s390/uaccess, locking/static_keys: employ static_branch_likely()
3bbfafb77a06 x86, tsc, locking/static_keys: Employ static_branch_likely()
1987c947d905 locking/static_keys: Add selftest
11276d5306b8 locking/static_keys: Add a new static_key interface
706249c222f6 locking/static_keys: Rework update logic
e33886b38cc8 locking/static_keys: Add static_key_{en,dis}able() helpers
7dcfd915bae5 jump_label: Add jump_entry_key() helper
a1efb01feca5 jump_label, locking/static_keys: Rename JUMP_LABEL_TYPE_* and related helpers to the static_key* pattern

Thanks,

	Ingo
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