[Xen-changelog] [xen staging] mm: disallow MEMF_no_refcount to be passed for domain-owned allocations

[p***@xen.org]

commit d13e07df79a1ee209dcbe02c52b59ced6210b826
Author: Jan Beulich <***@suse.com>
AuthorDate: Fri Nov 23 12:08:09 2018 +0100
Commit: Jan Beulich <***@suse.com>
CommitDate: Fri Nov 23 12:08:09 2018 +0100

mm: disallow MEMF_no_refcount to be passed for domain-owned allocations

When such pages get assigned to domains (and hence their ->tot_pages
not incremented accordingly) we would otherwise also need to suppress
decrementing the count when freeing those pages.

Signed-off-by: Jan Beulich <***@suse.com>
Reviewed-by: Andrew Cooper <***@citrix.com>
---
xen/common/page_alloc.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 08ee8cfbb9..4a2cbda1db 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -2303,6 +2303,11 @@ struct page_info *alloc_domheap_pages(

if ( memflags & MEMF_no_owner )
memflags |= MEMF_no_refcount;
+ else if ( (memflags & MEMF_no_refcount) && d )
+ {
+ ASSERT(!(memflags & MEMF_no_refcount));
+ return NULL;
+ }

if ( dma_bitsize && ((dma_zone = bits_to_zone(dma_bitsize)) < zone_hi) )
pg = alloc_heap_pages(dma_zone + 1, zone_hi, order, memflags, d);
--
generated by git-patchbot for /home/xen/git/xen.git#staging