The patch titled
Subject: mm-enable-page-poisoning-early-at-boot-v2
has been added to the -mm tree. Its filename is
mm-enable-page-poisoning-early-at-boot-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-enable-page-poisoning-early-at-boot-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-enable-page-poisoning-early-at-boot-v2.patch
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------------------------------------------------------
From: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Subject: mm-enable-page-poisoning-early-at-boot-v2
(1) Removed "select PAGE_EXTENSION" on CONFIG_PAGE_POISONING
(2) Removed CONFIG_PAGE_POISONING checks in page_ext.c
Link: http://lkml.kernel.org/r/1490878002-14423-1-git-send-email-vinmenon@xxxxxxxxxxxxxx
Signed-off-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig.debug | 1 -
mm/page_ext.c | 10 ++--------
2 files changed, 2 insertions(+), 9 deletions(-)
diff -puN mm/Kconfig.debug~mm-enable-page-poisoning-early-at-boot-v2 mm/Kconfig.debug
--- a/mm/Kconfig.debug~mm-enable-page-poisoning-early-at-boot-v2
+++ a/mm/Kconfig.debug
@@ -42,7 +42,6 @@ config DEBUG_PAGEALLOC_ENABLE_DEFAULT
config PAGE_POISONING
bool "Poison pages after freeing"
- select PAGE_EXTENSION
select PAGE_POISONING_NO_SANITY if HIBERNATION
---help---
Fill the pages with poison patterns after free_pages() and verify
diff -puN mm/page_ext.c~mm-enable-page-poisoning-early-at-boot-v2 mm/page_ext.c
--- a/mm/page_ext.c~mm-enable-page-poisoning-early-at-boot-v2
+++ a/mm/page_ext.c
@@ -124,15 +124,12 @@ struct page_ext *lookup_page_ext(struct
struct page_ext *base;
base = NODE_DATA(page_to_nid(page))->node_page_ext;
-#if defined(CONFIG_DEBUG_VM) || defined(CONFIG_PAGE_POISONING)
+#if defined(CONFIG_DEBUG_VM)
/*
* The sanity checks the page allocator does upon freeing a
* page can reach here before the page_ext arrays are
* allocated when feeding a range of pages to the allocator
* for the first time during bootup or memory hotplug.
- *
- * This check is also necessary for ensuring page poisoning
- * works as expected when enabled
*/
if (unlikely(!base))
return NULL;
@@ -201,15 +198,12 @@ struct page_ext *lookup_page_ext(struct
{
unsigned long pfn = page_to_pfn(page);
struct mem_section *section = __pfn_to_section(pfn);
-#if defined(CONFIG_DEBUG_VM) || defined(CONFIG_PAGE_POISONING)
+#if defined(CONFIG_DEBUG_VM)
/*
* The sanity checks the page allocator does upon freeing a
* page can reach here before the page_ext arrays are
* allocated when feeding a range of pages to the allocator
* for the first time during bootup or memory hotplug.
- *
- * This check is also necessary for ensuring page poisoning
- * works as expected when enabled
*/
if (!section->page_ext)
return NULL;
_
Patches currently in -mm which might be from vinmenon@xxxxxxxxxxxxxx are
mm-enable-page-poisoning-early-at-boot.patch
mm-enable-page-poisoning-early-at-boot-v2.patch
mm-vmscan-do-not-pass-reclaimed-slab-to-vmpressure.patch
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