linux-kernel - Re: [PATCH 4.19 00/42] 4.19.4-stable review

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Date:   Fri, 23 Nov 2018 04:06:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Thomas Voegtle <tv@...96.de>, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        shuah@...nel.org, patches@...nelci.org,
        ben.hutchings@...ethink.co.uk, lkft-triage@...ts.linaro.org,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH 4.19 00/42] 4.19.4-stable review

On 11/22/18 11:45 PM, Greg Kroah-Hartman wrote:
> On Thu, Nov 22, 2018 at 02:30:58PM -0800, Guenter Roeck wrote:
>> On 11/22/18 2:01 PM, Thomas Voegtle wrote:
>>> On Thu, 22 Nov 2018, Thomas Voegtle wrote:
>>>
>>>>
>>>> Doesn't compile for me on OpenSuSE 15.0 (gcc 7.3.1):
>>>>
>>>>    CALL    scripts/checksyscalls.sh
>>>>    DESCEND  objtool
>>>>    CHK     include/generated/compile.h
>>>>    CC [M]  drivers/gpu/drm/i915/i915_gem_gtt.o
>>>> drivers/gpu/drm/i915/i915_gem_gtt.c: In function ‘gen6_dump_ppgtt’:
>>>> drivers/gpu/drm/i915/i915_gem_gtt.c:1771:41: error: format ‘%llx’ expects
>>>> argument of type ‘long long unsigned int’, but argument 5 has type ‘long
>>>> unsigned int’ [-Werror=format=]
>>>>     seq_printf(m, "\t\t(%03d, %04d) %08llx: ",
>>>>                                     ~~~~~ ^
>>>>                                     %08lx
>>>> cc1: all warnings being treated as errors
>>>> make[4]: *** [scripts/Makefile.build:306:
>>>> drivers/gpu/drm/i915/i915_gem_gtt.o] Error 1
>>>> make[3]: *** [scripts/Makefile.build:546: drivers/gpu/drm/i915] Error 2
>>>> make[2]: *** [scripts/Makefile.build:546: drivers/gpu/drm] Error 2
>>>> make[1]: *** [scripts/Makefile.build:546: drivers/gpu] Error 2
>>>> make: *** [Makefile:1052: drivers] Error 2
>>>>
>>>>
>>>>
>>>> 4.19.3 is broken for me, too. 4.19.2 is works.
>>>> 4.20-rc tree works.
>>>>
>>>> Config attached.
>>>
>>>
>>> quick bisect shows problem is:
>>>
>>> commit 1a25e1a1be71a49ee7f34fb14b5a26191e6cf501
>>> Author: Chris Wilson <chris@...is-wilson.co.uk>
>>> Date:   Thu Oct 25 10:18:22 2018 +0100
>>>
>>>       drm/i915: Mark up GTT sizes as u64
>>>
>>>       commit c58281056a8b26d5d9dc15c19859a7880835ef44 upstream.
>>>
>>>
>>> reverted on 4.19.4-rc1 it compiles for me. I guess something is missing here?
>>>
>> AFAICS someone was not careful with the backport. Upstream doesn't have %llx
>> at that place.
> 
> Yes it does, unless I'm reading the code wrong?
> 

Ah, I was looking at v4.20-rc1, which didn't have it. Wrong branch, sorry.

> It seems that this does not trigger on upstream due to f6e35cda6614
> ("drm/i915: Replace some PAGE_SIZE with I915_GTT_PAGE_SIZE") being
> there, which changed the type of the variable being displayed here.
>  > I've now backported that as well, as it should help out over time, and
> the build warning seems to be gone.
> 
Makes sense.

Thanks,
Guenter