drivers/gpu/drm/rockchip/rockchip_drm_vop.c:185:20: warning: unused function 'vop_writel'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1e2a199f6ccdc15cf111d68d212e2fd4ce65682e
commit: 56fbacc9bf23d372d78eef3809c1ac93d88e11f4 Merge branches 'arm/renesas', 'arm/qcom', 'arm/mediatek', 'arm/omap', 'arm/exynos', 'arm/smmu', 'ppc/pamu', 'x86/vt-d', 'x86/amd' and 'core' into next
date:   6 months ago
config: mips-randconfig-r022-20210120 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1)
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=56fbacc9bf23d372d78eef3809c1ac93d88e11f4
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 56fbacc9bf23d372d78eef3809c1ac93d88e11f4
        # 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@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/rockchip/rockchip_drm_vop.c:185:20: warning: unused function 'vop_writel'
   static inline void vop_writel(struct vop uint32_t offset, uint32_t v)
   ^
   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)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
   clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 12.0.0 (git://gitmirror/llvm_project 22b68440e1647e16b5ee24b924986207173c02d1)
   Target: mips-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-22b68440e1/bin
   clang-12: note: diagnostic msg:
   Makefile arch drivers include kernel mm scripts source usr
--
>> drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c:320:20: warning: unused function 'dsi_set'
   static inline void dsi_set(struct dw_mipi_dsi_rockchip u32 reg, u32 mask)
   ^
>> drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c:325:20: warning: unused function 'dsi_update_bits'
   static inline void dsi_update_bits(struct dw_mipi_dsi_rockchip u32 reg,
   ^
   fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( 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 22b68440e1647e16b5ee24b924986207173c02d1)
   Target: mips-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-22b68440e1/bin
   clang-12: note: diagnostic msg:
   Makefile arch drivers include kernel mm scripts source usr


vim +/vop_writel +185 drivers/gpu/drm/rockchip/rockchip_drm_vop.c

2048e3286f347db5 Mark Yao 2014-08-22  184  
2048e3286f347db5 Mark Yao 2014-08-22 @185  static inline void vop_writel(struct vop *vop, uint32_t offset, uint32_t v)
2048e3286f347db5 Mark Yao 2014-08-22  186  {
2048e3286f347db5 Mark Yao 2014-08-22  187  	writel(v, vop->regs + offset);
2048e3286f347db5 Mark Yao 2014-08-22  188  	vop->regsbak[offset >> 2] = v;
2048e3286f347db5 Mark Yao 2014-08-22  189  }
2048e3286f347db5 Mark Yao 2014-08-22  190  

:::::: The code at line 185 was first introduced by commit
:::::: 2048e3286f347db5667708e47448176b5329e8d8 drm: rockchip: Add basic drm driver

:::::: TO: Mark Yao <mark.yao@xxxxxxxxxxxxxx>
:::::: CC: yzq <yzq@xxxxxxxxxxxxxx>

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

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