linux-kernel - Re: [linux41] regression with 'x86/cacheinfo: Move cacheinfo sysfs code to generic infrastructure' on AMD i686

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Date:	Thu, 17 Sep 2015 05:54:04 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Philip Müller <philm@...jaro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Guenter Roeck <linux@...ck-us.net>, manjaro-dev@...jaro.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andre Przywara <andre.przywara@....com>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [linux41] regression with 'x86/cacheinfo: Move cacheinfo sysfs
 code to generic infrastructure' on AMD i686

On Thu, Sep 17, 2015 at 09:15:04AM +0200, Borislav Petkov wrote:
> On Wed, Sep 16, 2015 at 07:52:47PM -0400, Josh Boyer wrote:
> > On Sun, Jul 26, 2015 at 10:42 AM, Borislav Petkov <bp@...en8.de> wrote:
> > > On Sun, Jul 26, 2015 at 12:54:55PM +0200, Philip Müller wrote:
> > >> I can confirm your patch working. However, it might be good to use yours
> > >> and Thomas' in combination to solve this properly.
> > >
> > > Please do not top-post.
> > >
> > > We could use Thomas' too although from looking at it,
> > > detect_cache_attributes() allocates a per-CPU per_cpu_cacheinfo thing
> > > for each CPU. By the time we hit cache_shared_cpu_map_remove() in
> > > free_cache_attributes(), those per_cpu_cacheinfo(cpu) things are still
> > > allocated. We kfree them in the next step only.
> > >
> > > But I like the moving of the check from the CPU hotplug callback to
> > > free_cache_attributes().
> > >
> > > So I'll merge the two patches and write up a proper commit message,
> > > unless someone objects.
> > >
> > > I'll add your Tested-by too.
> > 
> > Did this actually happen?  I don't see either fix in Linus' tree yet,
> > the merge window is closed, and the bug happens on 4.1 and 4.2 stable
> > kernels..
> 
> Greg wanted to pick it up...
> 
> Greg, what's up?

It's in my "to-apply" queue, let me go dig it up now...

thanks for the reminder.

greg k-h
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