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| author | Rich Felker <dalias@libc.org> | 2016-03-30 00:53:03 +0300 |
|---|---|---|
| committer | Rich Felker <dalias@libc.org> | 2016-03-30 00:53:03 +0300 |
| commit | 16b02d711f4059b8338ef967064195b47cae65ea (patch) | |
| tree | 6d3e0b7629210b56f8d6cfa39184c878d8a15367 /mm/page_ext.c | |
| parent | b15d53d009558d14c4f394a6d1fa2039c7f45c43 (diff) | |
| parent | f55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff) | |
| download | linux-16b02d711f4059b8338ef967064195b47cae65ea.tar.xz | |
Merge tag 'v4.6-rc1'
Linux 4.6-rc1
Diffstat (limited to 'mm/page_ext.c')
| -rw-r--r-- | mm/page_ext.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/page_ext.c b/mm/page_ext.c index 292ca7b8debd..2d864e64f7fe 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -106,12 +106,15 @@ struct page_ext *lookup_page_ext(struct page *page) struct page_ext *base; base = NODE_DATA(page_to_nid(page))->node_page_ext; -#ifdef CONFIG_DEBUG_VM +#if defined(CONFIG_DEBUG_VM) || defined(CONFIG_PAGE_POISONING) /* * 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; @@ -180,12 +183,15 @@ struct page_ext *lookup_page_ext(struct page *page) { unsigned long pfn = page_to_pfn(page); struct mem_section *section = __pfn_to_section(pfn); -#ifdef CONFIG_DEBUG_VM +#if defined(CONFIG_DEBUG_VM) || defined(CONFIG_PAGE_POISONING) /* * 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; |