[PATCH] mm: fix RODATA_TEST failure "rodata_test: test data was not read only"

From: Christophe Leroy
Date: Thu Sep 21 2017 - 05:37:38 EST

On powerpc, RODATA_TEST fails with message the following messages:

[ 6.199505] Freeing unused kernel memory: 528K
[ 6.203935] rodata_test: test data was not read only

This is because GCC allocates it to .data section:

c0695034 g O .data 00000004 rodata_test_data

Since commit 056b9d8a76924 ("mm: remove rodata_test_data export,
add pr_fmt"), rodata_test_data is used only inside rodata_test.c
By declaring it static, it gets properly allocated into .rodata
section instead of .data:

c04df710 l O .rodata 00000004 rodata_test_data

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
mm/rodata_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rodata_test.c b/mm/rodata_test.c
index 6bb4deb12e78..d908c8769b48 100644
--- a/mm/rodata_test.c
+++ b/mm/rodata_test.c
@@ -14,7 +14,7 @@
#include <linux/uaccess.h>
#include <asm/sections.h>

-const int rodata_test_data = 0xC3;
+static const int rodata_test_data = 0xC3;

void rodata_test(void)