* [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page()
@ 2022-04-18 6:19 Alaa Mohamed
2022-04-18 7:11 ` Julia Lawall
2022-04-19 9:16 ` Juergen Gross
0 siblings, 2 replies; 3+ messages in thread
From: Alaa Mohamed @ 2022-04-18 6:19 UTC (permalink / raw)
To: outreachy
Cc: boris.ostrovsky, jgross, sstabellini, xen-devel, linux-kernel,
ira.weiny, eng.alaamohamedsoliman.am
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page()
2022-04-18 6:19 [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page() Alaa Mohamed
@ 2022-04-18 7:11 ` Julia Lawall
2022-04-19 9:16 ` Juergen Gross
1 sibling, 0 replies; 3+ messages in thread
From: Julia Lawall @ 2022-04-18 7:11 UTC (permalink / raw)
To: Alaa Mohamed
Cc: outreachy, boris.ostrovsky, jgross, sstabellini, xen-devel,
linux-kernel, ira.weiny
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
>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page()
2022-04-18 6:19 [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page() Alaa Mohamed
2022-04-18 7:11 ` Julia Lawall
@ 2022-04-19 9:16 ` Juergen Gross
1 sibling, 0 replies; 3+ messages in thread
From: Juergen Gross @ 2022-04-19 9:16 UTC (permalink / raw)
To: Alaa Mohamed, outreachy
Cc: boris.ostrovsky, sstabellini, xen-devel, linux-kernel, ira.weiny
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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
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-04-18 6:19 [PATCH] xen: gntalloc.c: Convert kmap() to kmap_local_page() Alaa Mohamed
2022-04-18 7:11 ` Julia Lawall
2022-04-19 9:16 ` Juergen Gross
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