[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [PATCH 2/2] mm: add 'foreign' alias for the 'pinned' page flag



From: Jenny Herbert <jennifer.herbert@xxxxxxxxxx>

The foreign page flag will be used by Xen guests to mark pages that
have grant mappings of frames from other (foreign) guests.

The foreign flag is an alias for the existing (Xen-specific) pinned
flag.  This is safe because pinned is only used on pages used for page
tables and these cannot also be foreign.

Signed-off-by: Jenny Herbert <jennifer.herbert@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 include/linux/page-flags.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index e1f5fcd..7734cc8 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -123,6 +123,7 @@ enum pageflags {
        /* XEN */
        PG_pinned = PG_owner_priv_1,
        PG_savepinned = PG_dirty,
+       PG_foreign = PG_owner_priv_1,
 
        /* SLOB */
        PG_slob_free = PG_private,
@@ -215,6 +216,7 @@ __PAGEFLAG(Slab, slab)
 PAGEFLAG(Checked, checked)             /* Used by some filesystems */
 PAGEFLAG(Pinned, pinned) TESTSCFLAG(Pinned, pinned)    /* Xen */
 PAGEFLAG(SavePinned, savepinned);                      /* Xen */
+PAGEFLAG(Foreign, foreign);                            /* Xen */
 PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
 PAGEFLAG(SwapBacked, swapbacked) __CLEARPAGEFLAG(SwapBacked, swapbacked)
        __SETPAGEFLAG(SwapBacked, swapbacked)
-- 
1.7.10.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.