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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.

[[email protected]: warning fix]
[[email protected]: build fix]
Signed-off-by: Herbert Xu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Herbert Xu 2006-09-29 01:59:06 -07:00 • committed by Linus Torvalds
commit 684f978347
2 changed files with 23 additions and 21 deletions
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12
include/asm-powerpc/bug.h
View file

@ -70,9 +70,10 @@ struct bug_entry *find_bug(unsigned long bugaddr);
"i" (__FILE__), "i" (__FUNCTION__)); \
} while (0)
#define WARN_ON(x) do { \
if (__builtin_constant_p(x)) { \
if (x) \
#define WARN_ON(x) ({ \
typeof(x) __ret_warn_on = (x); \
if (__builtin_constant_p(__ret_warn_on)) { \
if (__ret_warn_on) \
__WARN(); \
} else { \
__asm__ __volatile__( \
@ -80,11 +81,12 @@ struct bug_entry *find_bug(unsigned long bugaddr);
".section __bug_table,\"a\"\n" \
"\t"PPC_LONG" 1b,%1,%2,%3\n" \
".previous" \
: : "r" ((long)(x)), \
: : "r" (__ret_warn_on), \
"i" (__LINE__ + BUG_WARNING_TRAP), \
"i" (__FILE__), "i" (__FUNCTION__)); \
} \
} while (0)
unlikely(__ret_warn_on); \
})
#define HAVE_ARCH_BUG
#define HAVE_ARCH_BUG_ON