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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>
This commit is contained in:
Johannes Berg 2013-02-21 16:42:47 -08:00 committed by Linus Torvalds
parent 3278bb748d
commit b1ae345d97
1 changed files with 3 additions and 1 deletions
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4
include/linux/lockdep.h
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@ -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)