linux-kernel - drivers/mmc/host/sdhci-esdhc-imx.c:343:19: warning: unused function 'is_imx6q

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Message-ID: <202102121300.nv3Usute-lkp@intel.com>
Date:   Fri, 12 Feb 2021 13:27:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: drivers/mmc/host/sdhci-esdhc-imx.c:343:19: warning: unused function
 'is_imx6q_usdhc'

Hi Krzysztof,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   291009f656e8eaebbdfd3a8d99f6b190a9ce9deb
commit: 54d8454436a205682bd89d66d8d9eedbc8452d15 mmc: host: Enable compile testing of multiple drivers
date:   5 months ago
config: mips-randconfig-r036-20210212 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54d8454436a205682bd89d66d8d9eedbc8452d15
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 54d8454436a205682bd89d66d8d9eedbc8452d15
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/mmc/host/sdhci-esdhc-imx.c:343:19: warning: unused function 'is_imx6q_usdhc'
   static inline int is_imx6q_usdhc(struct pltfm_imx_data
   ^
   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)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
   clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 12.0.0 (git://gitmirror/llvm_project c9439ca36342fb6013187d0a69aef92736951476)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-c9439ca363/bin
   clang-12: note: diagnostic msg:
   Makefile arch drivers fs include kernel mm scripts source usr
--
>> drivers/mmc/host/sdhci-sprd.c:134:20: warning: unused function 'sdhci_sprd_writew'
   static inline void sdhci_sprd_writew(struct sdhci_host u16 val, int reg)
   ^
   fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( 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-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 12.0.0 (git://gitmirror/llvm_project c9439ca36342fb6013187d0a69aef92736951476)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-c9439ca363/bin
   clang-12: note: diagnostic msg:
   Makefile arch drivers fs include kernel mm scripts source usr


vim +/is_imx6q_usdhc +343 drivers/mmc/host/sdhci-esdhc-imx.c

57ed3314e0bfa9 Shawn Guo 2011-06-30  342  
95a2482a9baaf5 Shawn Guo 2011-09-19 @343  static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
95a2482a9baaf5 Shawn Guo 2011-09-19  344  {
f47c4bbfa283df Shawn Guo 2013-10-17  345  	return data->socdata == &usdhc_imx6q_data;
95a2482a9baaf5 Shawn Guo 2011-09-19  346  }
95a2482a9baaf5 Shawn Guo 2011-09-19  347  

:::::: The code at line 343 was first introduced by commit
:::::: 95a2482a9baaf55a3403d2e76f2abd7c0a32298c mmc: sdhci-esdhc-imx: add basic imx6q usdhc support

:::::: TO: Shawn Guo <shawn.guo@...aro.org>
:::::: CC: Chris Ball <cjb@...top.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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