linux-kernel - Re: [PATCH] math-emu/setcc: avoid gcc extension

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Message-ID: <20070107195845.GA21829@infradead.org>
Date:	Sun, 7 Jan 2007 19:58:45 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	akpm <akpm@...l.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] math-emu/setcc: avoid gcc extension

On Sun, Jan 07, 2007 at 11:19:00AM -0800, Randy Dunlap wrote:
> On Sun, 7 Jan 2007 20:12:42 +0100 Segher Boessenkool wrote:
> 
> > There's an extra tab in that last line.  Could you also
> > please fix the indenting (use a tab, not spaces) -- I know
> > it was there originally, but since there are only a few
> > lines in that file like that...  :-)
> 
> how's this one?
> ---
> From: Randy Dunlap <randy.dunlap@...cle.com>
> 
> setcc() in math-emu is written as a gcc extension statement expression
> macro that returns a value.  However, it's not used that way and it's
> not needed like that, so just make it a do-while non-extension macro
> so that we don't use an extension when it's not needed.
> 
> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> ---
>  arch/i386/math-emu/status_w.h        |    5 +++--
> 
> ---
>  arch/i386/math-emu/status_w.h |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> --- linux-2620-rc2.orig/arch/i386/math-emu/status_w.h
> +++ linux-2620-rc2/arch/i386/math-emu/status_w.h
> @@ -48,9 +48,10 @@
>  
>  #define status_word() \
>    ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
> -#define setcc(cc) ({ \
> -  partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
> -  partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
> +#define setcc(cc) do { \
> +	partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
> +	partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); \
> +} while (0)

Is there any reason you this shouldn't be an inline function?

-
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