diff options
| author |   Johannes Berg <johannes.berg@intel.com> | 2013-02-21 16:42:47 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-21 17:22:19 -0800 |
| commit | b1ae345d971664f70cfdc293029c40ccfb093591 (patch) | |
| tree | dcc1e4e8aed9da51a87eca71a8b133a001487381 /include/linux/lockdep.h | |
| parent | ocfs2: unlock super lock if lockres refresh failed (diff) | |
| download | linux-dev-b1ae345d971664f70cfdc293029c40ccfb093591.tar.xz linux-dev-b1ae345d971664f70cfdc293029c40ccfb093591.zip | |
lockdep: make lockdep_assert_held() not have a return value
I recently made the mistake of writing:
foo = lockdep_dereference_protected(..., lockdep_assert_held(...));
which is clearly bogus. If lockdep is disabled in the config this would
cause a compile failure, if it is enabled then it compiles and causes a
puzzling warning about dereferencing without the correct protection.
Wrap the macro in "do { ... } while (0)" to also fail compile for this
when lockdep is enabled.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 2bca44b0893c..bfe88c4aa251 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -359,7 +359,9 @@ extern void lockdep_trace_alloc(gfp_t mask); #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) -#define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l)) +#define lockdep_assert_held(l) do { \ + WARN_ON(debug_locks && !lockdep_is_held(l)); \ + } while (0) #define lockdep_recursing(tsk) ((tsk)->lockdep_recursion) |