On 22.10.20 09:55, Jan Beulich wrote:
On 22.10.2020 09:42, Juergen Gross wrote:
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -236,6 +236,9 @@ static bool clear_masked_cond(volatile event_word_t *word)
w = *word;
+ if (!(w & (1 <<
On 22.10.2020 09:42, Juergen Gross wrote:
> --- a/drivers/xen/events/events_fifo.c
> +++ b/drivers/xen/events/events_fifo.c
> @@ -236,6 +236,9 @@ static bool clear_masked_cond(volatile event_word_t *word)
>
> w = *word;
>
> + if (!(w & (1 << EVTCHN_FIFO_MASKED)))
> +
Unmasking an event channel with fifo events channels being used can
require a hypercall to be made, so try to avoid that by checking
whether the event channel was really masked.
Suggested-by: Jan Beulich
Signed-off-by: Juergen Gross
---
drivers/xen/events/events_fifo.c | 3 +++
1 file changed,
3 matches
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