Hi,
On 15/07/2019 10:17, Paul Durrant wrote:
The _PGC_allocated flag is set on a page when it is assigned to a domain
along with an initial reference count of at least 1. To clear this
'allocation' reference it is necessary to test-and-clear _PGC_allocated and
then only drop the reference if the test-and-clear succeeds. This is open-
coded in many places. It is also unsafe to test-and-clear _PGC_allocated
unless the caller holds an additional reference.
This patch adds a helper function, put_page_alloc_ref(), to replace all the
open-coded test-and-clear/put_page occurrences and incorporates in that a
BUG_ON() an additional page reference not being held.
Signed-off-by: Paul Durrant <paul.durr...@citrix.com>
For the Arm bits:
Acked-by: Julien Grall <julien.gr...@arm.com>
Cheers,
--
Julien Grall
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
