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Date: Mon, 12 Mar 2007 09:39:12 +0100 (MET) From: Jan Engelhardt <jengelh@...ux01.gwdg.de> To: Jan Beulich <jbeulich@...ell.com> cc: Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@....de>, lkml - Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] BUILD_BUG_ON_ZERO -> BUILD_BUG_OR_ZERO On Mar 12 2007 08:23, Jan Beulich wrote: > >I have to admit that I don't see the point here - I can't seem to make any >sense of the OR... Jan BUILD_BUG_OR_ZERO will either (a) result in a build bug or (b) the number zero, suitable for arithmetic. >>>> Rusty Russell <rusty@...tcorp.com.au> 12.03.07 00:28 >>> >BUILD_BUG_ON_ZERO is named perfectly wrong, and BUILD_BUG_ON_RETURN_ZERO >is too long. Flip three bits, and the name is much more suitable. > >Signed-off-by: Rusty Russell <rusty@...tcorp.com.au> > >diff -r 6fb745a5bb51 include/linux/compiler-gcc.h >--- a/include/linux/compiler-gcc.h Mon Mar 12 09:12:20 2007 +1100 >+++ b/include/linux/compiler-gcc.h Mon Mar 12 09:51:18 2007 +1100 >@@ -24,7 +24,7 @@ > > /* &a[0] degrades to a pointer: a different type from an array */ > #define __must_be_array(a) \ >- BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0]))) >+ BUILD_BUG_OR_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0]))) > > #define inline inline __attribute__((always_inline)) > #define __inline__ __inline__ __attribute__((always_inline)) >diff -r 6fb745a5bb51 include/linux/kernel.h >--- a/include/linux/kernel.h Mon Mar 12 09:12:20 2007 +1100 >+++ b/include/linux/kernel.h Mon Mar 12 09:51:25 2007 +1100 >@@ -341,7 +341,7 @@ struct sysinfo { > result (of value 0 and type size_t), so the expression can be used > e.g. in a structure initializer (or where-ever else comma expressions > aren't permitted). */ >-#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) >+#define BUILD_BUG_OR_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) > > /* Trap pasters of __FUNCTION__ at compile-time */ > #define __FUNCTION__ (__func__) >diff -r 6fb745a5bb51 include/linux/moduleparam.h >--- a/include/linux/moduleparam.h Mon Mar 12 09:12:20 2007 +1100 >+++ b/include/linux/moduleparam.h Mon Mar 12 09:51:42 2007 +1100 >@@ -65,7 +65,7 @@ struct kparam_array > #define __module_param_call(prefix, name, set, get, arg, perm) \ > /* Default value instead of permissions? */ \ > static int __param_perm_check_##name __attribute__((unused)) = \ >- BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \ >+ BUILD_BUG_OR_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \ > static char __param_str_##name[] = prefix #name; \ > static struct kernel_param const __param_##name \ > __attribute_used__ \ > > >- >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/ > Jan -- - 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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