page-flags: define behavior of Xen-related flags on compound pages

PG_pinned and PG_savepinned are about page table's pages which are never
compound.

I'm not so sure about PG_foreign, but it seems we shouldn't see compound
pages there too.

Let's use NO_COMPOUND for all of them.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index d41c63b566b899703281b779bd396ae36ca87f20..19373c98d08a986e22b59a94a199e661d0c95428 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -282,9 +282,12 @@ PAGEFLAG(Active, active, HEAD) __CLEARPAGEFLAG(Active, active, HEAD)
 __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 */
-PAGEFLAG(Foreign, foreign, ANY);                               /* Xen */
+
+/* Xen */
+PAGEFLAG(Pinned, pinned, NO_COMPOUND) TESTSCFLAG(Pinned, pinned, NO_COMPOUND)
+PAGEFLAG(SavePinned, savepinned, NO_COMPOUND)
+PAGEFLAG(Foreign, foreign, NO_COMPOUND)
+
 PAGEFLAG(Reserved, reserved, ANY) __CLEARPAGEFLAG(Reserved, reserved, ANY)
 PAGEFLAG(SwapBacked, swapbacked, ANY)
        __CLEARPAGEFLAG(SwapBacked, swapbacked, ANY)