SL*B uses compound pages and marks head pages with PG_slab.
__SetPageSlab() and __ClearPageSlab() are never called for tail pages.
The same situation with PG_slob_free in SLOB allocator.
NO_TAIL is appropriate for these flags.
Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
---
include/linux/page-flags.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index bdb0d0e226c4..d41c63b566b8 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -279,7 +279,8 @@ PAGEFLAG(Dirty, dirty, HEAD) TESTSCFLAG(Dirty, dirty, HEAD)
PAGEFLAG(LRU, lru, HEAD) __CLEARPAGEFLAG(LRU, lru, HEAD)
PAGEFLAG(Active, active, HEAD) __CLEARPAGEFLAG(Active, active, HEAD)
TESTCLEARFLAG(Active, active, HEAD)
-__PAGEFLAG(Slab, slab, ANY)
+__PAGEFLAG(Slab, slab, NO_TAIL)
+__PAGEFLAG(SlobFree, slob_free, NO_TAIL)
PAGEFLAG(Checked, checked, NO_COMPOUND) /* Used by some filesystems */
PAGEFLAG(Pinned, pinned, ANY) TESTSCFLAG(Pinned, pinned, ANY) /* Xen */
PAGEFLAG(SavePinned, savepinned, ANY); /* Xen */
@@ -289,8 +290,6 @@ PAGEFLAG(SwapBacked, swapbacked, ANY)
__CLEARPAGEFLAG(SwapBacked, swapbacked, ANY)
__SETPAGEFLAG(SwapBacked, swapbacked, ANY)
-__PAGEFLAG(SlobFree, slob_free, ANY)
-
/*
* Private page markings that may be used by the filesystem that owns the page
* for its own purposes.
--
2.1.4
--
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