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authorYang Shi <yang.shi@linaro.org>2016-05-27 14:27:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-27 14:49:37 -0700
commitfe53ca54270a757f0a28ee6bf3a54d952b550ed0 (patch)
treef124113d718b8fc04880cfabe47efcec734b1f4d /mm/page_ext.c
parentf871f191357ebadb6ad7e8ecf6e8f40b694eea00 (diff)
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mm: use early_pfn_to_nid in page_ext_init
page_ext_init() checks suitable pages with pfn_to_nid(), but pfn_to_nid() depends on memmap which will not be setup fully until page_alloc_init_late() is done. Use early_pfn_to_nid() instead of pfn_to_nid() so that page extension could be still used early even though CONFIG_ DEFERRED_STRUCT_PAGE_INIT is enabled and catch early page allocation call sites. Suggested by Joonsoo Kim [1], this fix basically undoes the change introduced by commit b8f1a75d61d840 ("mm: call page_ext_init() after all struct pages are initialized") and fixes the same problem with a better approach. [1] http://lkml.kernel.org/r/CAAmzW4OUmyPwQjvd7QUfc6W1Aic__TyAuH80MLRZNMxKy0-wPQ@mail.gmail.com Link: http://lkml.kernel.org/r/1464198689-23458-1-git-send-email-yang.shi@linaro.org Signed-off-by: Yang Shi <yang.shi@linaro.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_ext.c')
-rw-r--r--mm/page_ext.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_ext.c b/mm/page_ext.c
index 2d864e64f7fe..44a4c029c8e7 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -390,8 +390,10 @@ void __init page_ext_init(void)
* We know some arch can have a nodes layout such as
* -------------pfn-------------->
* N0 | N1 | N2 | N0 | N1 | N2|....
+ *
+ * Take into account DEFERRED_STRUCT_PAGE_INIT.
*/
- if (pfn_to_nid(pfn) != nid)
+ if (early_pfn_to_nid(pfn) != nid)
continue;
if (init_section_page_ext(pfn, nid))
goto oom;