Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'for-linus-5.13b-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fix from Juergen Gross:
"A fix for a regression introduced in 5.12: when migrating an irq
related to a Xen user event to another cpu, a race might result
in a WARN() triggering"
* tag 'for-linus-5.13b-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/events: reset active flag for lateeoi events later
+10
-1
+10
-1
drivers/xen/events/events_base.c
+10
-1
drivers/xen/events/events_base.c
···
642
642
}
643
643
644
644
info->eoi_time = 0;
645
+
646
+
/* is_active hasn't been reset yet, do it now. */
647
+
smp_store_release(&info->is_active, 0);
645
648
do_unmask(info, EVT_MASK_REASON_EOI_PENDING);
646
649
}
647
650
···
814
811
BUG();
815
812
}
816
813
814
+
/* Not called for lateeoi events. */
817
815
static void event_handler_exit(struct irq_info *info)
818
816
{
819
817
smp_store_release(&info->is_active, 0);
···
1887
1883
1888
1884
if (VALID_EVTCHN(evtchn)) {
1889
1885
do_mask(info, EVT_MASK_REASON_EOI_PENDING);
1890
-
event_handler_exit(info);
1886
+
/*
1887
+
* Don't call event_handler_exit().
1888
+
* Need to keep is_active non-zero in order to ignore re-raised
1889
+
* events after cpu affinity changes while a lateeoi is pending.
1890
+
*/
1891
+
clear_evtchn(evtchn);
1891
1892
}
1892
1893
}
1893
1894