linux-kernel - [PATCH] log2: add missing () around n in roundup_pow_of

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Date:   Mon, 31 Aug 2020 11:50:15 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     Andrew Morton <akpm@...l.org>, David Howells <dhowells@...hat.com>
Subject: [PATCH] log2: add missing () around n in roundup_pow_of_two()

Otherwise gcc generates warnings if the expression is complicated.

Fixes: 312a0c170945 ("[PATCH] LOG2: Alter roundup_pow_of_two() so that it can use a ilog2() on a constant")
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
---
 include/linux/log2.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Hi Andrew, I think this is appropriate for your tree? Thanks

diff --git a/include/linux/log2.h b/include/linux/log2.h
index 83a4a3ca3e8a76..c619ec6eff4aee 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -173,7 +173,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
 #define roundup_pow_of_two(n)			\
 (						\
 	__builtin_constant_p(n) ? (		\
-		(n == 1) ? 1 :			\
+		((n) == 1) ? 1 :		\
 		(1UL << (ilog2((n) - 1) + 1))	\
 				   ) :		\
 	__roundup_pow_of_two(n)			\
-- 
2.28.0