Fix roundup_pow_of_two(1)

1 is a power of two, therefore roundup_pow_of_two(1) should return 1. It does
in case the argument is a variable but in case it's a constant it behaves
wrong and returns 0. Probably nobody ever did it so this was never noticed.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/log2.h b/include/linux/log2.h
index 57e641e19a81..1b8a2c1cb0e3 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -159,7 +159,7 @@ unsigned long __roundup_pow_of_two(unsigned long n)
 #define roundup_pow_of_two(n)                   \
 (                                               \
         __builtin_constant_p(n) ? (             \
-                (n == 1) ? 0 :                  \
+                (n == 1) ? 1 :                  \
                 (1UL << (ilog2((n) - 1) + 1))   \
                                    ) :          \
         __roundup_pow_of_two(n)                 \