linux-kernel - drivers/media/platform/qcom/camss/camss-vfe-170.c:191:20: warning: unused function 'vfe_reg

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Date:   Sun, 5 Sep 2021 17:06:41 +0800
From:   kernel test robot <lkp@...el.com>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: drivers/media/platform/qcom/camss/camss-vfe-170.c:191:20: warning:
 unused function 'vfe_reg_clr'

Hi Robert,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   49624efa65ac9889f4e7c7b2452b2e6ce42ba37d
commit: 7319cdf189bb643c6d56e5898ef89ad7c3ef6c31 media: camss: Add support for VFE hardware version Titan 170
date:   6 months ago
config: mips-randconfig-r003-20210904 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1104e3258b5064e7110cc297e2cec60ac9acfc0a)
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=7319cdf189bb643c6d56e5898ef89ad7c3ef6c31
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7319cdf189bb643c6d56e5898ef89ad7c3ef6c31
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=mips SHELL=/bin/bash drivers/media/platform/qcom/camss/ kernel/time/

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/media/platform/qcom/camss/camss-vfe-170.c:191:20: warning: unused function 'vfe_reg_clr'
   static inline void vfe_reg_clr(struct vfe_device u32 reg, u32 clr_bits)
   ^
   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-14: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 14.0.0 (git://gitmirror/llvm_project 6fe2beba7d2a41964af658c8c59dd172683ef739)
   Target: mips-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-6fe2beba7d/bin
   clang-14: note: diagnostic msg:
   Makefile arch drivers include kernel net scripts security sound source usr


vim +/vfe_reg_clr +191 drivers/media/platform/qcom/camss/camss-vfe-170.c

   190	
 > 191	static inline void vfe_reg_clr(struct vfe_device *vfe, u32 reg, u32 clr_bits)
   192	{
   193		u32 bits = readl_relaxed(vfe->base + reg);
   194	
   195		writel_relaxed(bits & ~clr_bits, vfe->base + reg);
   196	}
   197	

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

Download attachment ".config.gz" of type "application/gzip" (37531 bytes)