linux-kernel - [PATCH 03/12] selftests/mm: fix unused variable warning in migration.c

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Date:   Thu, 1 Jun 2023 18:33:49 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     David Hildenbrand <david@...hat.com>, Peter Xu <peterx@...hat.com>,
        "Shuah Khan" <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, <linux-mm@...ck.org>,
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 03/12] selftests/mm: fix unused variable warning in migration.c

Declare the variable as volatile, in order to avoid the clang compiler
warning.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 tools/testing/selftests/mm/migration.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/migration.c b/tools/testing/selftests/mm/migration.c
index 1cec8425e3ca..2dede662ff43 100644
--- a/tools/testing/selftests/mm/migration.c
+++ b/tools/testing/selftests/mm/migration.c
@@ -95,7 +95,7 @@ int migrate(uint64_t *ptr, int n1, int n2)
 
 void *access_mem(void *ptr)
 {
-	uint64_t y = 0;
+	volatile uint64_t y = 0;
 	volatile uint64_t *x = ptr;
 
 	while (1) {
-- 
2.40.1