+ mm-page_alloc-add-missing-check-for-memory-holes.patch added to -mm tree

+ mm-page_alloc-add-missing-check-for-memory-holes.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm, page_alloc: add missing check for memory holes
has been added to the -mm tree.  Its filename is
     mm-page_alloc-add-missing-check-for-memory-holes.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-add-missing-check-for-memory-holes.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-add-missing-check-for-memory-holes.patch

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------------------------------------------------------
From: Tony Luck <tony.luck@intel.com>
Subject: mm, page_alloc: add missing check for memory holes

13ad59df67f197 ("mm, page_alloc: avoid page_to_pfn() when merging
buddies") moved the check for memory holes out of page_is_buddy() and had
the callers do the check.

But this wasn't done correctly in one place which caused ia64 to crash
very early in boot.

Update to fix that and make ia64 boot again.

Fixes: 13ad59df67f1 ("avoid page_to_pfn() when merging buddies")
Link: http://lkml.kernel.org/r/1488929150-13629-1-git-send-email-tony.luck@intel.com
Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN mm/page_alloc.c~mm-page_alloc-add-missing-check-for-memory-holes mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-add-missing-check-for-memory-holes
+++ a/mm/page_alloc.c
@@ -873,7 +873,8 @@ done_merging:
 		higher_page = page + (combined_pfn - pfn);
 		buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1);
 		higher_buddy = higher_page + (buddy_pfn - combined_pfn);
-		if (page_is_buddy(higher_page, higher_buddy, order + 1)) {
+		if (pfn_valid_within(page_to_pfn(higher_buddy)) &&
+		    page_is_buddy(higher_page, higher_buddy, order + 1)) {
 			list_add_tail(&page->lru,
 				&zone->free_area[order].free_list[migratetype]);
 			goto out;
_

Patches currently in -mm which might be from tony.luck@intel.com are

mm-page_alloc-add-missing-check-for-memory-holes.patch