Hi Ville, kernel test robot noticed the following build warnings: [auto build test WARNING on next-20241003] [cannot apply to shawnguo/for-next linus/master rmk-arm/drm-armada-devel rmk-arm/drm-armada-fixes v6.12-rc1 v6.11 v6.11-rc7 v6.12-rc1] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Ville-Syrjala/drm-tilcdc-Allow-build-without-__iowmb/20241003-192043 base: next-20241003 patch link: https://lore.kernel.org/r/20241003111851.10453-3-ville.syrjala%40linux.intel.com patch subject: [PATCH v2 02/10] drm/tilcdc: Allow build with COMPILE_TEST=y config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20241004/202410042345.cQDnF4wd-lkp@xxxxxxxxx/config) compiler: alpha-linux-gcc (GCC) 13.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241004/202410042345.cQDnF4wd-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410042345.cQDnF4wd-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/tilcdc/tilcdc_crtc.c:24: drivers/gpu/drm/tilcdc/tilcdc_regs.h: In function 'tilcdc_write64': >> drivers/gpu/drm/tilcdc/tilcdc_regs.h:126:25: warning: passing argument 2 of 'iowrite64' discards 'volatile' qualifier from pointer target type [-Wdiscarded-qualifiers] 126 | iowrite64(data, addr); | ^~~~ In file included from arch/alpha/include/asm/io.h:15, from include/linux/scatterlist.h:9, from include/linux/dma-mapping.h:11, from drivers/gpu/drm/tilcdc/tilcdc_crtc.c:8: include/asm-generic/iomap.h:56:28: note: expected 'void *' but argument is of type 'volatile void *' 56 | extern void iowrite64(u64, void __iomem *); | ^~~~~~~~~~~~~~ vim +126 drivers/gpu/drm/tilcdc/tilcdc_regs.h 16ea975eac671f Rob Clark 2013-01-08 119 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 120 static inline void tilcdc_write64(struct drm_device *dev, u32 reg, u64 data) 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 121 { 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 122 struct tilcdc_drm_private *priv = dev->dev_private; 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 123 volatile void __iomem *addr = priv->mmio + reg; 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 124 4e5ca2d930aa87 Logan Gunthorpe 2017-12-05 125 #if defined(iowrite64) && !defined(iowrite64_is_nonatomic) 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 @126 iowrite64(data, addr); 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 127 #else d5b0aa96231c76 Ville Syrjälä 2024-10-03 128 /* allow compilation without __iowmb() for COMPILE_TEST */ d5b0aa96231c76 Ville Syrjälä 2024-10-03 129 #ifdef __iowmb 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 130 __iowmb(); d5b0aa96231c76 Ville Syrjälä 2024-10-03 131 #endif 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 132 /* This compiles to strd (=64-bit write) on ARM7 */ 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 133 *(volatile u64 __force *)addr = __cpu_to_le64(data); 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 134 #endif 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 135 } 7eb9f069ff5dd3 Jyri Sarha 2016-08-26 136 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
