** Tags added: cscc
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1797200
Title:
[Bionic] ACPI / PPTT: use ACPI ID whenever
ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Bug description:
[Impact]
Currently, we use the ACPI processor ID only for the leaf/processor nodes as
the specification states it must match the value of the ACPI processor ID field
in the processor’s entry in the MADT.
However, if a PPTT structure represents a processors group, it matches
a processor container UID in the namespace and the
ACPI_PPTT_ACPI_PROCESSOR_ID_VALID flag indicates whether the ACPI
processor ID is valid.
Let's use UID whenever ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set to be
consistent instead of using table offset as it's currently done for
non-leaf nodes.
Fixes: 2bd00bcd73e5 (ACPI/PPTT: Add Processor Properties Topology
Table parsing)
[Fix]
This patch in is 4.18:
30998033f62a ACPI / PPTT: use ACPI ID whenever
ACPI_PPTT_ACPI_PROCESSOR_ID_VALID is set
[Test]
-- testcase --
#!/bin/bash
stress-ng -q --vm 100 --vm-bytes 1G --cpu 210 --timeout 2400s --metrics-brief
&
pid=$!
for i in {1..210}; do
num=$((RANDOM%10+$i))
echo "Offline CPU $num"
echo 0 > /sys/devices/system/cpu/cpu$num/online || exit 1
sleep 3s
echo "Online CPU $num"
echo 1 > /sys/devices/system/cpu/cpu$num/online || exit 1
done
kill -9 $pid
----------------
Executed the test case with stock Bionic kernel and with Bionic kernel with
patches applied. No system hang or crash was observed. On Cavium CN99XX Thunder
X2 system.
[Regression Potential]
Regression tested on Cavium Thunder X2 CN99XX system, and none were found.
Regression risk is low.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797200/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
