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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-01 08:12:07 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-01 08:12:07 +0400
commit8d4fbcfbe0a4bfc73e7f0297c59ae514e1f1436f (patch)
treef4fe8e2028620b8aeb298c78ee5dc9d6df07e708 /include
parent2f63251ed0a803ddbe7bf2577b69d467aa872f68 (diff)
downloadlinux-8d4fbcfbe0a4bfc73e7f0297c59ae514e1f1436f.tar.xz
Fix WARN_ON() on bitfield ops
Alexey Dobriyan noticed that the new WARN_ON() semantics that were introduced by commit 684f978347deb42d180373ac4c427f82ef963171 (to also return the value to be warned on) didn't compile when given a bitfield, because the typeof doesn't work for bitfields. So instead of the typeof trick, use an "int" variable together with a "!!(x)" expression, as suggested by Al Viro. To make matters more interesting, Paul Mackerras points out that that is sub-optimal on Power, but the old asm-coded comparison seems to be buggy anyway on 32-bit Power if the conditional was 64-bit, so I think there are more problems there. Regardless, the new WARN_ON() semantics may have been a bad idea. But this at least avoids the more serious complications. Cc: Alexey Dobriyan <adobriyan@sw.ru> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Al Viro <viro@ftp.linux.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/bug.h6
-rw-r--r--include/asm-powerpc/bug.h2
2 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 344e3091af24..d56fedbb457a 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -33,7 +33,7 @@ struct bug_entry {
#ifndef HAVE_ARCH_WARN_ON
#define WARN_ON(condition) ({ \
- typeof(condition) __ret_warn_on = (condition); \
+ int __ret_warn_on = !!(condition); \
if (unlikely(__ret_warn_on)) { \
printk("WARNING: at %s:%d %s()\n", __FILE__, \
__LINE__, __FUNCTION__); \
@@ -54,7 +54,7 @@ struct bug_entry {
#ifndef HAVE_ARCH_WARN_ON
#define WARN_ON(condition) ({ \
- typeof(condition) __ret_warn_on = (condition); \
+ int __ret_warn_on = !!(condition); \
unlikely(__ret_warn_on); \
})
#endif
@@ -62,7 +62,7 @@ struct bug_entry {
#define WARN_ON_ONCE(condition) ({ \
static int __warned; \
- typeof(condition) __ret_warn_once = (condition); \
+ int __ret_warn_once = !!(condition); \
\
if (unlikely(__ret_warn_once)) \
if (WARN_ON(!__warned)) \
diff --git a/include/asm-powerpc/bug.h b/include/asm-powerpc/bug.h
index a248b8bd4d7c..e55d1f66b86f 100644
--- a/include/asm-powerpc/bug.h
+++ b/include/asm-powerpc/bug.h
@@ -93,7 +93,7 @@
} while (0)
#define WARN_ON(x) ({ \
- typeof(x) __ret_warn_on = (x); \
+ int __ret_warn_on = !!(x); \
if (__builtin_constant_p(__ret_warn_on)) { \
if (__ret_warn_on) \
__WARN(); \