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[PATCH] Let WARN_ON/WARN_ON_ONCE return the condition

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Letting WARN_ON/WARN_ON_ONCE return the condition means that you could do

if (WARN_ON(blah)) {
	handle_impossible_case
}

Rather than

if (unlikely(blah)) {
	WARN_ON(1)
	handle_impossible_case
}

I checked all the newly added WARN_ON_ONCE users and none of them test the
return status so we can still change it.

[akpm@osdl.org: warning fix]
[akpm@osdl.org: build fix]
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Herbert Xu
2006-09-29 01:59:06 -07:00
committed by Linus Torvalds
parent 6299a2dec8
commit 684f978347
2 changed files with 23 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/asm-generic/bug.h
+16 -16
View File
@@ -16,12 +16,15 @@
#endif
#ifndef HAVE_ARCH_WARN_ON
#define WARN_ON(condition) do { \
if (unlikely((condition)!=0)) { \
printk("BUG: warning at %s:%d/%s()\n", __FILE__, __LINE__, __FUNCTION__); \
dump_stack(); \
} \
} while (0)
#define WARN_ON(condition) ({ \
typeof(condition) __ret_warn_on = (condition); \
if (unlikely(__ret_warn_on)) { \
printk("BUG: warning at %s:%d/%s()\n", __FILE__, \
__LINE__, __FUNCTION__); \
dump_stack(); \
} \
unlikely(__ret_warn_on); \
})
#endif
#else /* !CONFIG_BUG */
@@ -34,21 +37,18 @@
#endif
#ifndef HAVE_ARCH_WARN_ON
#define WARN_ON(condition) do { if (condition) ; } while(0)
#define WARN_ON(condition) unlikely((condition))
#endif
#endif
#define WARN_ON_ONCE(condition) \
({ \
#define WARN_ON_ONCE(condition) ({ \
static int __warn_once = 1; \
int __ret = 0; \
typeof(condition) __ret_warn_once = (condition);\
\
if (unlikely((condition) && __warn_once)) { \
__warn_once = 0; \
WARN_ON(1); \
__ret = 1; \
} \
__ret; \
if (likely(__warn_once)) \
if (WARN_ON(__ret_warn_once)) \
__warn_once = 0; \
unlikely(__ret_warn_once); \
})
#ifdef CONFIG_SMP