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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-09-19 23:44:07 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-09-20 00:36:16 +0200 |
| commit | 4d35427ad7641cba08ea0deffae1a78147ad41c0 (patch) | |
| tree | 832a652ea61f198004cd27bfa8cc56a24087d422 /fs/autofs4 | |
| parent | mm, thp: fix leaking mapped pte in __collapse_huge_page_swapin() (diff) | |
| download | linux-4d35427ad7641cba08ea0deffae1a78147ad41c0.tar.xz linux-4d35427ad7641cba08ea0deffae1a78147ad41c0.zip | |
mm: avoid endless recursion in dump_page()
dump_page() uses page_mapcount() to get mapcount of the page.
page_mapcount() has VM_BUG_ON_PAGE(PageSlab(page)) as mapcount doesn't
make sense for slab pages and the field in struct page used for other
information.
It leads to recursion if dump_page() called for slub page and DEBUG_VM
is enabled:
dump_page() -> page_mapcount() -> VM_BUG_ON_PAGE() -> dump_page -> ...
Let's avoid calling page_mapcount() for slab pages in dump_page().
Link: http://lkml.kernel.org/r/20160908082137.131076-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/autofs4')
0 files changed, 0 insertions, 0 deletions