drivers/xen/gntalloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
The use of kmap() is being deprecated in favor of kmap_local_page()
where it is feasible.
With kmap_local_page(), the mapping is per thread, CPU local and not
globally visible. Therefore __del_gref() is a function
where the use of kmap_local_page() in place of kmap() is correctly
suited.
Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@gmail.com>
---
drivers/xen/gntalloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 4849f94372a4..55acb32842a3 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -178,9 +178,9 @@ static void __del_gref(struct gntalloc_gref *gref)
unsigned long addr;
if (gref->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) {
- uint8_t *tmp = kmap(gref->page);
+ uint8_t *tmp = kmap_local_page(gref->page);
tmp[gref->notify.pgoff] = 0;
- kunmap(gref->page);
+ kunmap_local(tmp);
}
if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT) {
notify_remote_via_evtchn(gref->notify.event);
--
2.35.2
On 18.04.22 08:19, Alaa Mohamed wrote: > The use of kmap() is being deprecated in favor of kmap_local_page() > where it is feasible. > > With kmap_local_page(), the mapping is per thread, CPU local and not > globally visible. Therefore __del_gref() is a function > where the use of kmap_local_page() in place of kmap() is correctly > suited. > > Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@gmail.com> Reviewed-by: Juergen Gross <jgross@suse.com> Juergen
On Mon, 18 Apr 2022, Alaa Mohamed wrote: > The use of kmap() is being deprecated in favor of kmap_local_page() > where it is feasible. > > With kmap_local_page(), the mapping is per thread, CPU local and not > globally visible. Therefore __del_gref() is a function > where the use of kmap_local_page() in place of kmap() is correctly > suited. What is it about __del_gref() that makes this change the right choice? julia > > Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@gmail.com> > --- > drivers/xen/gntalloc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c > index 4849f94372a4..55acb32842a3 100644 > --- a/drivers/xen/gntalloc.c > +++ b/drivers/xen/gntalloc.c > @@ -178,9 +178,9 @@ static void __del_gref(struct gntalloc_gref *gref) > unsigned long addr; > > if (gref->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) { > - uint8_t *tmp = kmap(gref->page); > + uint8_t *tmp = kmap_local_page(gref->page); > tmp[gref->notify.pgoff] = 0; > - kunmap(gref->page); > + kunmap_local(tmp); > } > if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT) { > notify_remote_via_evtchn(gref->notify.event); > -- > 2.35.2 > > >
© 2016 - 2024 Red Hat, Inc.