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Subject: Re: [kbuild-all] Re: drivers/gpu/drm/kmb/kmb_dsi.c:812:2: warning:
 unused function 'set_test_mode_src_osc_freq_target_low_bits'
To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        kernel test robot <lkp@intel.com>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Anitha Chrisanthus <anitha.chrisanthus@intel.com>
References: <202206300147.qdDDrtfw-lkp@intel.com>
 <CAMuHMdXA5fNgGxoYfb=9GNxYtXyVn-ENH8u5gXkKcVufhnciXQ@mail.gmail.com>
From:   "Chen, Rong A" <rong.a.chen@intel.com>
Message-ID: <8e9e1143-f2ea-3a56-71b0-e34105bc1d01@intel.com>
Date:   Thu, 30 Jun 2022 17:08:11 +0800
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On 6/30/2022 2:03 AM, Geert Uytterhoeven wrote:
> Hi Kernel Test Robot,
> 
> On Wed, Jun 29, 2022 at 7:57 PM kernel test robot <lkp@intel.com> wrote:
>> First bad commit (maybe != root cause):
> 
> Definitely not introduced by my patch.
> Looks like these functions were never used at all.

Hi Geert,

Sorry for the inconvenience, we'll add the commit to ignore list.

Best Regards,
Rong Chen

> 
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   d9b2ba67917c18822c6a09af41c32fa161f1606b
>> commit: ade896460e4a62f5e4a892a98d254937f6f5b64c drm: DRM_KMB_DISPLAY should depend on ARCH_KEEMBAY
>> date:   1 year, 8 months ago
>> config: mips-randconfig-r016-20220629 (https://download.01.org/0day-ci/archive/20220630/202206300147.qdDDrtfw-lkp@intel.com/config)
>> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a774ba7f60d1fef403b5507b1b1a7475d3684d71)
>> reproduce (this is a W=1 build):
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # install mips cross compiling tool for clang build
>>          # apt-get install binutils-mipsel-linux-gnu
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ade896460e4a62f5e4a892a98d254937f6f5b64c
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout ade896460e4a62f5e4a892a98d254937f6f5b64c
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/gpu/drm/kmb/ drivers/net/ethernet/mellanox/mlxsw/ drivers/scsi/ufs/ drivers/staging/ fs/xfs/
>>
>> If you fix the issue, kindly add following tag where applicable
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> drivers/gpu/drm/kmb/kmb_dsi.c:812:2: warning: unused function 'set_test_mode_src_osc_freq_target_low_bits'
>>     set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi
>>     ^
>>>> drivers/gpu/drm/kmb/kmb_dsi.c:824:2: warning: unused function 'set_test_mode_src_osc_freq_target_hi_bits'
>>     set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi
>>     ^
>>     fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
>>     clang-15: error: clang frontend command failed with exit code 70 (use -v to see invocation)
>>     clang version 15.0.0 (git://gitmirror/llvm_project a774ba7f60d1fef403b5507b1b1a7475d3684d71)
>>     Target: mipsel-unknown-linux
>>     Thread model: posix
>>     InstalledDir: /opt/cross/clang-a774ba7f60/bin
>>     clang-15: note: diagnostic msg:
>>     Makefile arch drivers fs include kernel mm nr_bisected scripts source usr
>>
>>
>> vim +/set_test_mode_src_osc_freq_target_low_bits +812 drivers/gpu/drm/kmb/kmb_dsi.c
>>
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  810
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  811  static inline void
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04 @812       set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi *kmb_dsi,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  813                                                  u32 dphy_no,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  814                                                  u32 freq)
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  815  {
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  816       /* Typical rise/fall time=166, refer Table 1207 databook,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  817        * sr_osc_freq_target[7:0]
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  818        */
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  819       test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  820                      (freq & 0x7f));
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  821  }
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  822
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  823  static inline void
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04 @824       set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi *kmb_dsi,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  825                                                 u32 dphy_no,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  826                                                 u32 freq)
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  827  {
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  828       u32 data;
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  829
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  830       /* Flag this as high nibble */
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  831       data = ((freq >> 6) & 0x1f) | (1 << 7);
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  832
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  833       /* Typical rise/fall time=166, refer Table 1207 databook,
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  834        * sr_osc_freq_target[11:7]
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  835        */
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  836       test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES, data);
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  837  }
>> 98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  838
>>
>> :::::: The code at line 812 was first introduced by commit
>> :::::: 98521f4d4b4cb265374a4b1e13b41287a1960243 drm/kmb: Mipi DSI part of the display driver
>>
>> :::::: TO: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
>> :::::: CC: Sam Ravnborg <sam@ravnborg.org>
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds
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