[PATCH] drm/drm_fb_helper: fix fbdev with sparc64

[kernel test robot]

Hi Sam,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master v5.8-rc4 next-20200709]
[cannot apply to drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sam-Ravnborg/drm-drm_fb_helper-fix-fbdev-with-sparc64/20200710-033231
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-randconfig-s021-20200709 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-37-gc9676a3b-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/drm_fb_helper.c:386:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem * @@     got void *dst @@
>> drivers/gpu/drm/drm_fb_helper.c:386:29: sparse:     expected void volatile [noderef] __iomem *
>> drivers/gpu/drm/drm_fb_helper.c:386:29: sparse:     got void *dst

vim +386 drivers/gpu/drm/drm_fb_helper.c

   373	
   374	static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
   375						  struct drm_clip_rect *clip)
   376	{
   377		struct drm_framebuffer *fb = fb_helper->fb;
   378		unsigned int cpp = fb->format->cpp[0];
   379		size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
   380		void *src = fb_helper->fbdev->screen_buffer + offset;
   381		void *dst = fb_helper->buffer->vaddr + offset;
   382		size_t len = (clip->x2 - clip->x1) * cpp;
   383		unsigned int y;
   384	
   385		for (y = clip->y1; y < clip->y2; y++) {
 > 386			memcpy_toio(dst, src, len);
   387			src += fb->pitches[0];
   388			dst += fb->pitches[0];
   389		}
   390	}
   391	

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