linux-kernel - [PATCH] mm/init-mm.c: use CPU_BITS_NONE to initialize .cpu

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Message-Id: <20190822075207.26400-1-linux@rasmusvillemoes.dk>
Date:   Thu, 22 Aug 2019 09:52:07 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm/init-mm.c: use CPU_BITS_NONE to initialize .cpu_bitmap

init_mm is sizeof(long) larger than it needs to be. Use the
CPU_BITS_NONE macro meant for this, which will initialize just the
indices 0...(BITS_TO_LONGS(NR_CPUS)-1) and hence make the array size
actually BITS_TO_LONGS(NR_CPUS).

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 mm/init-mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/init-mm.c b/mm/init-mm.c
index a787a319211e..fb1e15028ef0 100644
--- a/mm/init-mm.c
+++ b/mm/init-mm.c
@@ -35,6 +35,6 @@ struct mm_struct init_mm = {
 	.arg_lock	=  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
 	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
 	.user_ns	= &init_user_ns,
-	.cpu_bitmap	= { [BITS_TO_LONGS(NR_CPUS)] = 0},
+	.cpu_bitmap	= CPU_BITS_NONE,
 	INIT_MM_CONTEXT(init_mm)
 };
-- 
2.20.1