linux-kernel - Re: [PATCH] Use more gcc extensions in the Linux headers

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Date:	Sat, 10 Mar 2007 09:57:32 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Use more gcc extensions in the Linux headers

On Fri, 2007-03-09 at 16:56 +1100, Rusty Russell wrote:
> __builtin_types_compatible_p() has been around since gcc 2.95, and we
> don't use it anywhere.  This patch quietly fixes that.

OK, many people complained that it needed a comment.  Good point!
==
Add comment to ARRAY_SIZE macro.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r 933e410f204f include/linux/kernel.h
--- a/include/linux/kernel.h	Sat Mar 10 09:55:31 2007 +1100
+++ b/include/linux/kernel.h	Sat Mar 10 09:55:53 2007 +1100
@@ -35,6 +35,7 @@ extern const char linux_proc_banner[];
 #define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
 #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
 
+/* GCC is awesome. */
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])			      \
 	+ sizeof(typeof(int[1 - 2*!!__builtin_types_compatible_p(typeof(arr), \
 		 typeof(&arr[0]))]))*0)



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