Module Name: src
Committed By: riastradh
Date: Fri Nov 10 19:24:17 UTC 2017
Modified Files:
src/sys/arch/xen/xen: evtchn.c
Log Message:
Fix theoretical race in xen_evtchn_trymask.
This now matches ioapic_trymask:
- Caller masks CPU interrupts while the PIC's interrupts are unmasked.
- Trymask masks the PIC's interrupts, and tests whether any were
pending that we missed because the CPU interrupts are masked.
==> If there were any pending, trymask unmasks PIC's interrupts and
returns false.
==> If not, interrupts are masked on the PIC and CPU and there were
none pending and trymask returns true.
No functional change right now because cpu_intr_redistribute is
currently disabled on Xen.
ok cherry
To generate a diff of this commit:
cvs rdiff -u -r1.74 -r1.75 src/sys/arch/xen/xen/evtchn.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
