linux-kernel - Re: [PATCH] riscv: asm/gdb_xml.h: use __maybe

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Date:   Thu, 2 Jul 2020 09:20:52 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vincent Chen <vincent.chen@...ive.com>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de, broonie@...nel.org,
        kernel test robot <lkp@...el.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "open list:RISC-V ARCHITECTURE" <linux-riscv@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: asm/gdb_xml.h: use __maybe_used to make W=1
 warnings go away



On 7/1/20 9:04 PM, Vincent Chen wrote:
> On Thu, Jul 2, 2020 at 2:48 AM Pierre-Louis Bossart
> <pierre-louis.bossart@...ux.intel.com> wrote:
>>
>> 0day/kbuild reports warnings with the ASoC codecs compiled with W=1.
>>
>> In file included from arch/riscv/include/asm/kgdb.h:109,
>>                   from include/linux/kgdb.h:20,
>>                   from include/linux/fb.h:5,
>>                   from include/drm/drm_crtc.h:31,
>>                   from sound/soc/codecs/hdmi-codec.c:19:
>>
>> arch/riscv/include/asm/gdb_xml.h:23:19: warning:
>> 'riscv_gdb_stub_cpuxml' defined but not used [-Wunused-const-variable=]
>>     23 | static const char riscv_gdb_stub_cpuxml[2048] =
>>        |                   ^~~~~~~~~~~~~~~~~~~~~
>> arch/riscv/include/asm/gdb_xml.h:16:19: warning:
>> 'riscv_gdb_stub_target_desc' defined but not used [-Wunused-const-variable=]
>>     16 | static const char riscv_gdb_stub_target_desc[256] =
>>        |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/riscv/include/asm/gdb_xml.h:13:19: warning:
>> 'gdb_xfer_read_cpuxml' defined but not used [-Wunused-const-variable=]
>>     13 | static const char gdb_xfer_read_cpuxml[39] =
>>        |                   ^~~~~~~~~~~~~~~~~~~~
>> arch/riscv/include/asm/gdb_xml.h:10:19: warning:
>> 'gdb_xfer_read_target' defined but not used [-Wunused-const-variable=]
>>     10 | static const char gdb_xfer_read_target[31] = "qXfer:features:read:target.xml:";
>>        |                   ^~~~~~~~~~~~~~~~~~~~
>> arch/riscv/include/asm/gdb_xml.h:7:19: warning:
>> 'riscv_gdb_stub_feature' defined but not used [-Wunused-const-variable=]
>>      7 | static const char riscv_gdb_stub_feature[64] =
>>        |                   ^~~~~~~~~~~~~~~~~~~~~~
>>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> ---
>>
>> I don't know if this is the right way of solving this issue but this
>> error is now consistently thrown in kbuild compile-test reports w/
>> W=1.
>>
> 
> Dear Pierre-Louis Bossart:
> Thanks for your modifications. I have fixed the warnings in my latest
> KGDB patchset and sent it out, but the merged KGDB patchset is not my
> latest version.
> I have sent a patch set to complement the missing ports, and I think
> these warnings would disappear after this patch has been accepted and
> merged.
> 
> Here is the patch to fix this warning:
> http://lists.infradead.org/pipermail/linux-riscv/2020-June/000660.html

Thank you Vincent, let's drop my hacky patch then.