[kbuild-all] [asahilinux:t6000/bringup-work 20/23] drivers/gpu/drm/drm_format_helper.c:408:6: warning: no previous prototype for 'drm_fb_xrgb8888_to_xrgb2101010_dstclip'

tree: https://github.com/AsahiLinux/linux t6000/bringup-work head: 62c107f5adde6d76632c6e2c1eff3efa25707099 commit: f32fd9413157a8c6e03acaca0504d4c3512d780e [20/23] drm/format-helper: Add drm_fb_xrgb8888_to_xrgb2101010_dstclip() config: ia64-defconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 11.2.0 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 # https://github.com/AsahiLinux/linux/commit/f32fd9413157a8c6e03acaca0504d4... git remote add asahilinux https://github.com/AsahiLinux/linux git fetch --no-tags asahilinux t6000/bringup-work git checkout f32fd9413157a8c6e03acaca0504d4c3512d780e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 408 | void drm_fb_xrgb8888_to_xrgb2101010_dstclip(void __iomem *dst, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/printk.h:8, from include/linux/numa.h:24, from arch/ia64/include/asm/nodedata.h:14, from arch/ia64/include/asm/processor.h:81, from arch/ia64/include/asm/timex.h:15, from include/linux/timex.h:65, from include/linux/time32.h:13, from include/linux/time.h:60, from include/linux/stat.h:19, from include/linux/module.h:13, from drivers/gpu/drm/drm_format_helper.c:11: include/linux/export.h:67:43: error: redefinition of '__ksymtab_drm_fb_xrgb8888_to_rgb888_dstclip' 67 | static const struct kernel_symbol __ksymtab_##sym \ | ^~~~~~~~~~ include/linux/export.h:108:9: note: in expansion of macro '__KSYMTAB_ENTRY' 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ include/linux/export.h:152:41: note: in expansion of macro '___EXPORT_SYMBOL' 152 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) | ^~~~~~~~~~~~~~~~ include/linux/export.h:160:41: note: in expansion of macro '__EXPORT_SYMBOL' 160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:163:41: note: in expansion of macro '_EXPORT_SYMBOL' 163 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ drivers/gpu/drm/drm_format_helper.c:433:1: note: in expansion of macro 'EXPORT_SYMBOL' 433 | EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip); | ^~~~~~~~~~~~~ include/linux/export.h:67:43: note: previous definition of '__ksymtab_drm_fb_xrgb8888_to_rgb888_dstclip' with type 'const struct kernel_symbol' 67 | static const struct kernel_symbol __ksymtab_##sym \ | ^~~~~~~~~~ include/linux/export.h:108:9: note: in expansion of macro '__KSYMTAB_ENTRY' 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ include/linux/export.h:152:41: note: in expansion of macro '___EXPORT_SYMBOL' 152 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) | ^~~~~~~~~~~~~~~~ include/linux/export.h:160:41: note: in expansion of macro '__EXPORT_SYMBOL' 160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:163:41: note: in expansion of macro '_EXPORT_SYMBOL' 163 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ drivers/gpu/drm/drm_format_helper.c:379:1: note: in expansion of macro 'EXPORT_SYMBOL' 379 | EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip); | ^~~~~~~~~~~~~ vim +/drm_fb_xrgb8888_to_xrgb2101010_dstclip +408 drivers/gpu/drm/drm_format_helper.c 392 393 /** 394 * drm_fb_xrgb8888_to_xrgb2101010_dstclip - Convert XRGB8888 to XRGB2101010 clip 395 * buffer 396 * @dst: XRGB2101010 destination buffer (iomem) 397 * @dst_pitch: destination buffer pitch 398 * @vaddr: XRGB8888 source buffer 399 * @fb: DRM framebuffer 400 * @clip: Clip rectangle area to copy 401 * 402 * Drivers can use this function for XRGB2101010 devices that don't natively 403 * support XRGB8888. 404 * 405 * This function applies clipping on dst, i.e. the destination is a 406 * full (iomem) framebuffer but only the clip rect content is copied over. 407 */ 409 unsigned int dst_pitch, void *vaddr, 410 struct drm_framebuffer *fb, 411 struct drm_rect *clip) 412 { 413 size_t linepixels = clip->x2 - clip->x1; 414 size_t dst_len = linepixels * 4; 415 unsigned y, lines = clip->y2 - clip->y1; 416 void *dbuf; 417 418 dbuf = kmalloc(dst_len, GFP_KERNEL); 419 if (!dbuf) 420 return; 421 422 vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32)); 423 dst += clip_offset(clip, dst_pitch, sizeof(u16)); 424 for (y = 0; y < lines; y++) { 425 drm_fb_xrgb8888_to_xrgb2101010_line(dbuf, vaddr, linepixels); 426 memcpy_toio(dst, dbuf, dst_len); 427 vaddr += fb->pitches[0]; 428 dst += dst_len; 429 } 430 431 kfree(dbuf); 432 } 433 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip); 434 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org