[kvm-unit-tests,v5,03/14] libcflat: introduce is_power_of_2()

Commit Message

Peter Xu Nov. 15, 2016, 10:24 p.m. UTC

Suggested-by: Andrew Jones <[e-mail]>
Reviewed-by: Andrew Jones <[e-mail]>
Signed-off-by: Peter Xu <[e-mail]>
---
 lib/libcflat.h | 5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/lib/libcflat.h b/lib/libcflat.h
index 72b1bf9..038ea1d 100644
--- a/lib/libcflat.h
+++ b/lib/libcflat.h
@@ -103,4 +103,9 @@  do {									\
 	}								\
 } while (0)
 
+static inline bool is_power_of_2(unsigned long n)
+{
+	return n && !(n & (n - 1));
+}
+
 #endif