Hi Thomas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on next-20200623]
[cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.8-rc2]
[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/Thomas-Zimmermann/drm-ast-Managed-modesetting/20200623-162238
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
:::::: branch date: 19 hours ago
:::::: commit date: 19 hours ago
config: x86_64-randconfig-s021-20200623 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/ast/ast_cursor.c:250:26: sparse: sparse: duplicate [noderef]
>> drivers/gpu/drm/ast/ast_cursor.c:250:26: sparse: sparse: multiple address space given: __iomem & __iomem

# https://github.com/0day-ci/linux/commit/f438d6b57853cfafd5057aef14de32086b93e43d
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout f438d6b57853cfafd5057aef14de32086b93e43d
vim +250 drivers/gpu/drm/ast/ast_cursor.c

233fef619e5ac2 Thomas Zimmermann 2020-06-23  245  
f438d6b57853cf Thomas Zimmermann 2020-06-23  246  void ast_cursor_show(struct ast_private *ast, int x, int y,
233fef619e5ac2 Thomas Zimmermann 2020-06-23  247  		     unsigned int offset_x, unsigned int offset_y)
30686a542ba2b5 Thomas Zimmermann 2020-06-23  248  {
233fef619e5ac2 Thomas Zimmermann 2020-06-23  249  	u8 x_offset, y_offset;
f438d6b57853cf Thomas Zimmermann 2020-06-23 @250  	u8 __iomem *dst, __iomem *sig;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  251  	u8 jreg;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  252  
f438d6b57853cf Thomas Zimmermann 2020-06-23  253  	dst = ast->cursor.vaddr[ast->cursor.next_index];
30686a542ba2b5 Thomas Zimmermann 2020-06-23  254  
30686a542ba2b5 Thomas Zimmermann 2020-06-23  255  	sig = dst + AST_HWC_SIZE;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  256  	writel(x, sig + AST_HWC_SIGNATURE_X);
30686a542ba2b5 Thomas Zimmermann 2020-06-23  257  	writel(y, sig + AST_HWC_SIGNATURE_Y);
30686a542ba2b5 Thomas Zimmermann 2020-06-23  258  
30686a542ba2b5 Thomas Zimmermann 2020-06-23  259  	if (x < 0) {
233fef619e5ac2 Thomas Zimmermann 2020-06-23  260  		x_offset = (-x) + offset_x;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  261  		x = 0;
233fef619e5ac2 Thomas Zimmermann 2020-06-23  262  	} else {
233fef619e5ac2 Thomas Zimmermann 2020-06-23  263  		x_offset = offset_x;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  264  	}
30686a542ba2b5 Thomas Zimmermann 2020-06-23  265  	if (y < 0) {
233fef619e5ac2 Thomas Zimmermann 2020-06-23  266  		y_offset = (-y) + offset_y;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  267  		y = 0;
233fef619e5ac2 Thomas Zimmermann 2020-06-23  268  	} else {
233fef619e5ac2 Thomas Zimmermann 2020-06-23  269  		y_offset = offset_y;
30686a542ba2b5 Thomas Zimmermann 2020-06-23  270  	}
233fef619e5ac2 Thomas Zimmermann 2020-06-23  271  
233fef619e5ac2 Thomas Zimmermann 2020-06-23  272  	ast_cursor_set_location(ast, x, y, x_offset, y_offset);
30686a542ba2b5 Thomas Zimmermann 2020-06-23  273  
30686a542ba2b5 Thomas Zimmermann 2020-06-23  274  	/* dummy write to fire HWC */
30686a542ba2b5 Thomas Zimmermann 2020-06-23  275  	jreg = 0x02 |
30686a542ba2b5 Thomas Zimmermann 2020-06-23  276  	       0x01; /* enable ARGB4444 cursor */
30686a542ba2b5 Thomas Zimmermann 2020-06-23  277  	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xcb, 0xfc, jreg);
30686a542ba2b5 Thomas Zimmermann 2020-06-23  278  }
10536b22de4fbf Thomas Zimmermann 2020-06-23  279  

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