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Message-Id: <1173481052.32234.137.camel@localhost.localdomain> 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) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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