[PATCH 07/16] page-flags: define behavior SL*B-related flags on compound pages

[Kirill A. Shutemov]

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.shutemov@xxxxxxxxxxxxxxx>
---
 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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