The patch titled
Subject: mm-handle-page-mapping-better-in-dump_page-fix
has been added to the -mm tree. Its filename is
mm-handle-page-mapping-better-in-dump_page-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-handle-page-mapping-better-in-dump_page-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-handle-page-mapping-better-in-dump_page-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-handle-page-mapping-better-in-dump_page-fix
augmented code comment from John
Link: http://lkml.kernel.org/r/15cff11a-6762-8a6a-3f0e-dd227280cd6f@xxxxxxxxxx
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/debug.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/mm/debug.c~mm-handle-page-mapping-better-in-dump_page-fix
+++ a/mm/debug.c
@@ -69,7 +69,13 @@ void __dump_page(struct page *page, cons
}
if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) {
- /* Corrupt page, cannot call page_mapping */
+ /*
+ * Corrupt page, so we cannot call page_mapping. Instead, do a
+ * safe subset of the steps that page_mapping() does. Caution:
+ * this will be misleading for tail pages, PageSwapCache pages,
+ * and potentially other situations. (See the page_mapping()
+ * implementation for what's missing here.)
+ */
unsigned long tmp = (unsigned long)page->mapping;
if (tmp & PAGE_MAPPING_ANON)
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
mm-close-race-between-munmap-and-expand_upwards-downwards-fix.patch
mm.patch
mm-handle-page-mapping-better-in-dump_page-fix.patch
mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix.patch
mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix-fix.patch
mm-vmstat-add-events-for-thp-migration-without-split-fix.patch
linux-next-rejects.patch
mm-madvise-introduce-process_madvise-syscall-an-external-memory-hinting-api-fix.patch
mm-madvise-introduce-process_madvise-syscall-an-external-memory-hinting-api-fix-2.patch
kernel-forkc-export-kernel_thread-to-modules.patch
