Merge branch 'linus' into perf/core, to refresh the branch

Signed-off-by: Ingo Molnar <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index defeaac0745f..299e76b59fe9 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -227,6 +227,22 @@ static inline unsigned long __ffs64(u64 word)
 })
 #endif
 
+#ifndef bit_clear_unless
+#define bit_clear_unless(ptr, _clear, _test)	\
+({								\
+	const typeof(*ptr) clear = (_clear), test = (_test);	\
+	typeof(*ptr) old, new;					\
+								\
+	do {							\
+		old = ACCESS_ONCE(*ptr);			\
+		new = old & ~clear;				\
+	} while (!(old & test) &&				\
+		 cmpxchg(ptr, old, new) != old);		\
+								\
+	!(old & test);						\
+})
+#endif
+
 #ifndef find_last_bit
 /**
  * find_last_bit - find the last set bit in a memory region