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

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Message-ID: <CA+5PVA51W9EwDKCx1u-ONA_g-zVuhSKf9ux8wCTQbviBH5qTog@mail.gmail.com>
Date:	Wed, 16 Sep 2015 19:52:47 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	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 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..

josh
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