From: Xiao Guangrong <xiaoguangr...@tencent.com>
It will be used by threaded workqueue
Signed-off-by: Xiao Guangrong <xiaoguangr...@tencent.com>
---
include/qemu/bitops.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 3f0926cf40..c522958852 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -79,6 +79,19 @@ static inline void change_bit(long nr, unsigned long *addr)
*p ^= mask;
}
+/**
+ * change_bit_atomic - Toggle a bit in memory atomically
+ * @nr: Bit to change
+ * @addr: Address to start counting from
+ */
+static inline void change_bit_atomic(long nr, unsigned long *addr)
+{
+ unsigned long mask = BIT_MASK(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
+
+ atomic_xor(p, mask);
+}
+
/**
* test_and_set_bit - Set a bit and return its old value
* @nr: Bit to set
--
2.14.5
