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Date:   Tue, 26 Feb 2019 10:18:45 -0800
From:   Guenter Roeck <linux@roeck-us.net>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
        akpm@linux-foundation.org, shuah@kernel.org, patches@kernelci.org,
        ben.hutchings@codethink.co.uk, lkft-triage@lists.linaro.org,
        stable@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH 4.9 00/63] 4.9.161-stable review
Message-ID: <20190226181845.GA2568@roeck-us.net>
References: <20190225195035.713274200@linuxfoundation.org>
 <20190226174109.GA8682@roeck-us.net>
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On Tue, Feb 26, 2019 at 09:41:09AM -0800, Guenter Roeck wrote:
> On Mon, Feb 25, 2019 at 10:11:00PM +0100, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 4.9.161 release.
> > There are 63 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> > 
> > Responses should be made by Wed Feb 27 19:50:06 UTC 2019.
> > Anything received after that time might be too late.
> > 
> Build results:
> 	total: 172 pass: 170 fail: 2
> Failed builds: 
> 	powerpc:defconfig 
> 	powerpc:ppc6xx_defconfig
> Qemu test results:
> 	total: 315 pass: 315 fail: 0
> 
> Same build error as with v4.4.y, plus:
> 
> arch/powerpc/platforms/pseries/hotplug-memory.c: In function ‘dlpar_memory’:
> arch/powerpc/platforms/pseries/hotplug-memory.c:782:9: error:
> 	‘rc’ may be used uninitialized in this function
> 
> which I completely fail to understand. It doesn't seeem to affect
> any other kernel version, and it looks like it is another compiler bug.
> I'll see if I can find out how to avoid it (other than reverting
> to an older version of gcc). Not a concern for now.
> 
The problem seems to be related to dependencies. It is addressed upstream
with commit 2b800f7c0c6c ("powerpc/cell: Drop select of MEMORY_HOTPLUG").
After this patch is applied, MEMORY_HOTPLUG is no longer enabled with
powerpc:defconfig, and the problem is no longer seen.

Copying Michael to see if there is any concern about having this patch
applied to v4.9.y.

Guenter