Re: Patch "x86/mce: Remove noinstr annotation from mce_setup()" has been added to the 5.15-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jan 13, 2022 at 04:40:00PM +0100, Borislav Petkov wrote:
> On Thu, Jan 13, 2022 at 03:31:49PM +0100, Greg KH wrote:
> > Any hints on how to get rid of this?  More patches in the series this
> > one came from?
> 
> Unfortunately, a whole series:
> 
> https://lore.kernel.org/r/20211208111343.8130-1-bp@alien8.de
> 
> and the 0day bot guys recently managed to trigger another warning there,
> which means even more fixes, even to generic code.
> 
> So what that warning tells you is that you call into instrumentable
> context from non-instrumentable one. But that has relevance only when
> someone traces the MCE code - and up until now I haven't received a
> single sensible use case for why that would make any sense.
> 
> So long story short, you can safely ignore it and if someone complains,
> ask her/him about the use case first and CC me.
> 
> :-)

Ok, will just ignore it, 5.16.y should only be alive for a few months
(4?) so it's not that big of a deal, I was just trying to ensure
0-warning builds were happening as it's easier to notice when I mess
something up with the stable releases.

I'll go drop this commit now, thanks.

greg k-h