Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Description changed:
SRU Justification
- [Impacy]
+ [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.
+ 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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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:
New
Status in linux source package in Lunar:
New
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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