linux-kernel - Re: [PATCH 5/7] signal: Silence nested-externs warnings

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Date:	Fri, 19 Sep 2014 14:21:28 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Richard Weinberger <richard@....at>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, sparse@...isli.org,
	Mark Rustad <mark.d.rustad@...el.com>,
	linux-sparse@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH 5/7] signal: Silence nested-externs warnings

On Fri, Sep 19, 2014 at 07:20:30PM +0200, Oleg Nesterov wrote:
> On 09/19, Richard Weinberger wrote:
> >
> > Am 19.09.2014 17:37, schrieb Jeff Kirsher:
> > >
> > > See patch 1 of the series.
> >
> > I was not CC'ed...
> 
> Me too, and thus I don't understand this patch.
> 
> But I have to admit it looks a bit ugly to me anyway.
> Can't we simply kill _NSIG_WORDS_is_unsupported_size ?

This looks quite preferable.  Can you post that with a commit message
and signoff?  Also, the indentation on the second of the three BUILD_BUG
calls has some spaces in it, which it shouldn't.  With those fixed:
Reviewed-by: Josh Triplett <josh@...htriplett.org>

> diff --git a/include/linux/signal.h b/include/linux/signal.h
> index 750196f..679c9b4 100644
> --- a/include/linux/signal.h
> +++ b/include/linux/signal.h
> @@ -67,7 +67,6 @@ static inline int sigismember(sigset_t *set, int _sig)
>  
>  static inline int sigisemptyset(sigset_t *set)
>  {
> -	extern void _NSIG_WORDS_is_unsupported_size(void);
>  	switch (_NSIG_WORDS) {
>  	case 4:
>  		return (set->sig[3] | set->sig[2] |
> @@ -77,7 +76,7 @@ static inline int sigisemptyset(sigset_t *set)
>  	case 1:
>  		return set->sig[0] == 0;
>  	default:
> -		_NSIG_WORDS_is_unsupported_size();
> +		BUILD_BUG();
>  		return 0;
>  	}
>  }
> @@ -90,7 +89,6 @@ static inline int sigisemptyset(sigset_t *set)
>  #define _SIG_SET_BINOP(name, op)					\
>  static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
>  {									\
> -	extern void _NSIG_WORDS_is_unsupported_size(void);		\
>  	unsigned long a0, a1, a2, a3, b0, b1, b2, b3;			\
>  									\
>  	switch (_NSIG_WORDS) {						\
> @@ -107,7 +105,7 @@ static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
>  		r->sig[0] = op(a0, b0);					\
>  		break;							\
>  	    default:							\
> -		_NSIG_WORDS_is_unsupported_size();			\
> +	    	BUILD_BUG();						\
>  	}								\
>  }
>  
> @@ -128,8 +126,6 @@ _SIG_SET_BINOP(sigandnsets, _sig_andn)
>  #define _SIG_SET_OP(name, op)						\
>  static inline void name(sigset_t *set)					\
>  {									\
> -	extern void _NSIG_WORDS_is_unsupported_size(void);		\
> -									\
>  	switch (_NSIG_WORDS) {						\
>  	    case 4: set->sig[3] = op(set->sig[3]);			\
>  		    set->sig[2] = op(set->sig[2]);			\
> @@ -137,7 +133,7 @@ static inline void name(sigset_t *set)					\
>  	    case 1: set->sig[0] = op(set->sig[0]);			\
>  		    break;						\
>  	    default:							\
> -		_NSIG_WORDS_is_unsupported_size();			\
> +		BUILD_BUG();						\
>  	}								\
>  }
>  
> 
> --
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