Merge tag 'pinctrl-v4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...

[linux-2.6-block.git] / arch / x86 / include / asm / bitops.h

diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
index 68557f52b9619ddfed7681fc43c2d0530c625f0f..854022772c5be4d49d2697bd2b66b454f49c9e6f 100644 (file)
--- a/arch/x86/include/asm/bitops.h
+++ b/arch/x86/include/asm/bitops.h
@@ -139,6 +139,19 @@ static __always_inline void __clear_bit(long nr, volatile unsigned long *addr)
        asm volatile("btr %1,%0" : ADDR : "Ir" (nr));
 }
 
+static __always_inline bool clear_bit_unlock_is_negative_byte(long nr, volatile unsigned long *addr)
+{
+       bool negative;
+       asm volatile(LOCK_PREFIX "andb %2,%1\n\t"
+               CC_SET(s)
+               : CC_OUT(s) (negative), ADDR
+               : "ir" ((char) ~(1 << nr)) : "memory");
+       return negative;
+}
+
+// Let everybody know we have it
+#define clear_bit_unlock_is_negative_byte clear_bit_unlock_is_negative_byte
+
 /*
  * __clear_bit_unlock - Clears a bit in memory
  * @nr: Bit to clear