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authorMichal Hocko <mhocko@kernel.org>2018-04-05 16:25:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 21:36:27 -0700
commit91241681c62a5a690c88eb2aca027f094125eaac (patch)
treecad7912bd078096ca33893be54443fb9b97676f5
parent2c7452a075d4db2dc8e7a61369ede1afc05cd63e (diff)
downloadlinux-91241681c62a5a690c88eb2aca027f094125eaac.tar.bz2
include/linux/mmdebug.h: make VM_WARN* non-rvals
At present the construct if (VM_WARN(...)) will compile OK with CONFIG_DEBUG_VM=y and will fail with CONFIG_DEBUG_VM=n. The reason is that VM_{WARN,BUG}* have always been special wrt. {WARN/BUG}* and never generate any code when DEBUG_VM is disabled. So we cannot really use it in conditionals. We considered changing things so that this construct works in both cases but that might cause unwanted code generation with CONFIG_DEBUG_VM=n. It is safer and simpler to make the build fail in both cases. [akpm@linux-foundation.org: changelog] Signed-off-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mmdebug.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 57b0030d3800..2ad72d2c8cc5 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -37,10 +37,10 @@ void dump_mm(const struct mm_struct *mm);
BUG(); \
} \
} while (0)
-#define VM_WARN_ON(cond) WARN_ON(cond)
-#define VM_WARN_ON_ONCE(cond) WARN_ON_ONCE(cond)
-#define VM_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
-#define VM_WARN(cond, format...) WARN(cond, format)
+#define VM_WARN_ON(cond) (void)WARN_ON(cond)
+#define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
+#define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
+#define VM_WARN(cond, format...) (void)WARN(cond, format)
#else
#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)