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[RFC,PKS/PMEM,44/58] drivers/xen: Utilize new kmap_thread()

Message ID 20201009195033.3208459-45-ira.weiny@intel.com
State New, archived
Headers show
Series PMEM: Introduce stray write protection for PMEM | expand

Commit Message

Ira Weiny Oct. 9, 2020, 7:50 p.m. UTC
From: Ira Weiny <ira.weiny@intel.com>

These kmap() calls are localized to a single thread.  To avoid the over
head of global PKRS updates use the new kmap_thread() call.

Cc: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 drivers/xen/gntalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 3fa40c723e8e..3b78e055feff 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -184,9 +184,9 @@  static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
 static void __del_gref(struct gntalloc_gref *gref)
 {
 	if (gref->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) {
-		uint8_t *tmp = kmap(gref->page);
+		uint8_t *tmp = kmap_thread(gref->page);
 		tmp[gref->notify.pgoff] = 0;
-		kunmap(gref->page);
+		kunmap_thread(gref->page);
 	}
 	if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT) {
 		notify_remote_via_evtchn(gref->notify.event);