[Bug 2048404] Re: Don't WARN_ON_ONCE() for a broken discovery table

This bug is awaiting verification that the linux-xilinx-
zynqmp/5.15.0-1029.33 kernel in -proposed solves the problem. Please
test the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-jammy-linux-xilinx-zynqmp'
to 'verification-done-jammy-linux-xilinx-zynqmp'. If the problem still
exists, change the tag 'verification-needed-jammy-linux-xilinx-zynqmp'
to 'verification-failed-jammy-linux-xilinx-zynqmp'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-xilinx-zynqmp-v2 verification-needed-jammy-linux-xilinx-zynqmp

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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 Released
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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