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Subject[PATCH] mm/page_poison: move PAGE_POISON to page_poison.c
Date
The PAGE_POISON macro is used in page_poison.c only, so avoid exporting
it. Also remove the "mm/debug-pagealloc.c" related comment, which is
obsolete.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
---
include/linux/poison.h | 7 -------
mm/page_poison.c | 6 ++++++
2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/include/linux/poison.h b/include/linux/poison.h
index 15927eb..348bf67 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -30,13 +30,6 @@
*/
#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)

-/********** mm/debug-pagealloc.c **********/
-#ifdef CONFIG_PAGE_POISONING_ZERO
-#define PAGE_POISON 0x00
-#else
-#define PAGE_POISON 0xaa
-#endif
-
/********** mm/page_alloc.c ************/

#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
diff --git a/mm/page_poison.c b/mm/page_poison.c
index e83fd44..8aaf076 100644
--- a/mm/page_poison.c
+++ b/mm/page_poison.c
@@ -7,6 +7,12 @@
#include <linux/poison.h>
#include <linux/ratelimit.h>

+#ifdef CONFIG_PAGE_POISONING_ZERO
+#define PAGE_POISON 0x00
+#else
+#define PAGE_POISON 0xaa
+#endif
+
static bool want_page_poisoning __read_mostly;

static int early_page_poison_param(char *buf)
--
2.7.4
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