** Changed in: linux (Ubuntu Lunar)
Status: In Progress => Won't Fix
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2048404
Title:
Don't WARN_ON_ONCE() for a broken discovery table
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Fix Committed
Status in linux source package in Lunar:
Won't Fix
Bug description:
SRU Justification
[Impact]
perf/x86/uncore: Don't WARN_ON_ONCE() for a broken discovery table
The kernel warning message is triggered, when SPR MCC is used.
[ 17.945331] ------------[ cut here ]------------
[ 17.946305] WARNING: CPU: 65 PID: 1 at
arch/x86/events/intel/uncore_discovery.c:184
intel_uncore_has_discovery_tables+0x4c0/0x65c
[ 17.946305] Modules linked in:
[ 17.946305] CPU: 65 PID: 1 Comm: swapper/0 Not tainted
5.4.17-2136.313.1-X10-2c+ #4
It's caused by the broken discovery table of UPI.
The discovery tables are from hardware. Except for dropping the broken
information, there is nothing Linux can do. Using WARN_ON_ONCE() is
overkilled.
Use the pr_info() to replace WARN_ON_ONCE(), and specify what uncore unit
is dropped and the reason.
[Fix]
Commit 5d515ee40cb57ea5331998f27df7946a69f14dc3 ('perf/x86/uncore:
Don't WARN_ON_ONCE() for a broken discovery table')
[Test]
AWS tested
[Regression potential]
Low regression potential. Only the code that prints the warning has
been changed.
[Other Info]
SF: #00347830
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