freebsd-nq/sys/x86
Conrad Meyer 1c5df7bd01 x86 MCA: Fix a deadlock in MCA exception processing
In exceptional circumstances, an MCA exception will trigger when the
freelist is exhausted. In such a case, no error will be logged on the list
and 'mca_count' will not be incremented.

Prior to this patch, all CPUs that received the exception would spin
forever.

With this change, the CPU that detects the error but finds the freelist
empty will proceed to panic the machine, ending the deadlock.

A follow-up to r260457.

Reported by:	Ryan Libby <rlibby at gmail.com>
Reviewed by:	jhb@
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D10536
2017-04-28 18:25:10 +00:00
..
acpica - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
bios
cpufreq - Mention mismatching numbers in MSR vs. ACPI _PSS count warning: seeing 2016-12-01 14:31:05 +00:00
include Remove the LSOL26CALLS_SEL constant. 2017-04-25 23:19:27 +00:00
iommu Correct calculation of the entry->free_down in the invariants-checking 2017-04-14 15:16:41 +00:00
isa Validate values read from the RTC before trying BCD decoding 2017-03-09 02:19:30 +00:00
pci Convert PCIe Hot Plug to using pci_request_feature 2017-02-25 06:11:59 +00:00
x86 x86 MCA: Fix a deadlock in MCA exception processing 2017-04-28 18:25:10 +00:00
xen All these files need sys/vmmeter.h, but now they got it implicitly 2017-04-17 17:07:00 +00:00