linux-kernel - Re: [Stable-review] [12/28] x86, cpu: Clean up AMD erratum 400 workaround

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Date:	Thu, 5 May 2011 15:53:02 -0700
From:	Greg KH <gregkh@...e.de>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Hans Rosenfeld <hans.rosenfeld@....com>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, "H. Peter Anvin" <hpa@...ux.intel.com>,
	torvalds@...ux-foundation.org, stable-review@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [Stable-review] [12/28] x86, cpu: Clean up AMD erratum 400
 workaround

On Thu, Apr 21, 2011 at 04:29:15AM +0100, Ben Hutchings wrote:
> > We got a few new quirks added for AMD hardware platforms that fix
> > problems.
> 
> Maybe, but I still haven't seen anyone explain what those problems are!

I'll let the AMD people answer this.

> > It took 3 patches to get there, yes, but now, as time goes
> > on, adding new ones is even easier as the .32 code matches the .39 code
> > in this area due to these patches being added.
> > 
> > Now if you find problems in these, great, let me know and I will work to
> > resolve them.
> > 
> > As for regressions, what are you referring to?
> 
> These are the regressions I'm aware of in the last few updates:
> 
> 2.6.32.36: 'x86: Cleanup highmap after brk is concluded' broke
> hibernation on x86-64 and some x86-32 machines (reverted in .37)
> 2.6.32.36: 'signal: Prevent rt_sigqueueinfo and rt_tgsigqueueinfo from
> spoofing the signal code' broke glibc aio (fixed in .37)
> 2.6.32.34: powerpc kdump/kexec changes didn't compile on UP or 32-bit
> (fixed in .37)
> 2.6.32.30: 'x86 quirk: Fix polarity for IRQ0 pin2 override on SB800
> systems' broke the revision check for other quirks (fixed in .34)

Bugs are always a part of life, the fact that we fix them is what is
important.

> 2.6.32.29: 'USB: Prevent buggy hubs from crashing the USB stack' broke
> MUSB on BeagleBoards (still unfixed?)

This woried me, as I don't recall anyone notifying me of it.  Then I saw
your revert, and I noticed that all you really need to resolve this is
commit id ec95d35a6bd0047f05fe8a21e6c52f8bb418da55 to be added to the
tree.  I'll go queue that one up for the next .32-stable tree.

So all should be resolved now, right?

thanks,

greg k-h
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