backport: perf/x86/uncore: Don't WARN_ON_ONCE() for a broken discovery table

backport: perf/x86/uncore: Don't WARN_ON_ONCE() for a broken discovery table

[Mahmoud Adam]

Hi,

Please backport following commit to 6.1 and 5.15.

Commit 5d515ee40cb57ea5331998f27df7946a69f14dc3 upstream

On SPR MCC the discovery table of UPI is broken, there is a patchset [1]
to mitigate this which landed around v6.3, this can't be backported to
stable releases since it is based on SPR related patches which will be
needed in case of mitigation backport, but already WARN_ON_ONCE in this
case is not needed here since this is hardware problem that linux can do
nothing about it, this patch replace WARN_ON_ONCE with pr_info, and
specify what uncore unit is dropped and the reason

[1] https://lore.kernel.org/all/20230112200105.733466-1-kan.liang@linux.intel.com/

thanks,
MNAdam

Re: backport: perf/x86/uncore: Don't WARN_ON_ONCE() for a broken discovery table

[Greg KH]

On Fri, Dec 15, 2023 at 05:57:24PM +0100, Mahmoud Adam wrote:
> Hi,
> 
> Please backport following commit to 6.1 and 5.15.
> 
> Commit 5d515ee40cb57ea5331998f27df7946a69f14dc3 upstream
> 
> On SPR MCC the discovery table of UPI is broken, there is a patchset [1]
> to mitigate this which landed around v6.3, this can't be backported to
> stable releases since it is based on SPR related patches which will be
> needed in case of mitigation backport, but already WARN_ON_ONCE in this
> case is not needed here since this is hardware problem that linux can do
> nothing about it, this patch replace WARN_ON_ONCE with pr_info, and
> specify what uncore unit is dropped and the reason
> 
> [1] https://lore.kernel.org/all/20230112200105.733466-1-kan.liang@linux.intel.com/

Now queued up, thanks.

greg k-h