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

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On powerpc, RODATA_TEST fails with message the following messages:

  Freeing unused kernel memory: 528K
  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 056b9d8a76 ("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

Fixes: 056b9d8a76 ("mm: remove rodata_test_data export, add pr_fmt")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Christophe Leroy <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Jinbum Park <[email protected]>
Cc: Segher Boessenkool <[email protected]>
Cc: David Laight <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christophe Leroy 2017-10-03 16:15:16 -07:00 • committed by Linus Torvalds
commit a872eb2131
1 changed files with 1 additions and 1 deletions
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2
mm/rodata_test.c
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@ -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)
{