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xen: privcmd: Don't mark eventfd waiter as EXCLUSIVE

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Don't set WQ_FLAG_EXCLUSIVE when adding an irqfd to a wait queue, as
irqfd_wakeup() unconditionally returns '0', i.e. doesn't actually operate
in exclusive mode.

Note, the use of WQ_FLAG_PRIORITY is also dubious, but that's a problem
for another day.

Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250522235223.3178519-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-05-22 16:52:17 -07:00
parent 867347bb21
commit a52664134a
1 changed files with 0 additions and 1 deletions
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1
drivers/xen/privcmd.c
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@@ -957,7 +957,6 @@ irqfd_poll_func(struct file *file, wait_queue_head_t *wqh, poll_table *pt)
struct privcmd_kernel_irqfd *kirqfd =
container_of(pt, struct privcmd_kernel_irqfd, pt);
kirqfd->wait.flags |= WQ_FLAG_EXCLUSIVE;
add_wait_queue_priority(wqh, &kirqfd->wait);
}