linux-kernel - Re: [PATCH v6 23/36] drm: vmwgfx: fix common struct sg

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Date:   Fri, 19 Jun 2020 11:05:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Roland Scheidegger <sroland@...are.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v6 23/36] drm: vmwgfx: fix common struct sg_table related
 issues

Hi Marek,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20200618]
[also build test WARNING on v5.8-rc1]
[cannot apply to linuxtv-media/master staging/staging-testing drm-exynos/exynos-drm-next drm-intel/for-linux-next linus/master v5.8-rc1 v5.7 v5.7-rc7]
[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/Marek-Szyprowski/DRM-fix-struct-sg_table-nents-vs-orig_nents-misuse/20200619-000417
base:    ce2cc8efd7a40cbd17841add878cb691d0ce0bba
config: x86_64-randconfig-s021-20200618 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-rc1-10-gc17b1b06-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@...el.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:365:38: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected struct sg_table *sgt @@     got struct sg_table sgt @@
>> drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:365:38: sparse:     expected struct sg_table *sgt
>> drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:365:38: sparse:     got struct sg_table sgt
   drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:386:43: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected struct sg_table *sgt @@     got struct sg_table sgt @@
   drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:386:43: sparse:     expected struct sg_table *sgt
   drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c:386:43: sparse:     got struct sg_table sgt

vim +365 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c

   352	
   353	/**
   354	 * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
   355	 * TTM pages
   356	 *
   357	 * @vmw_tt: Pointer to a struct vmw_ttm_backend
   358	 *
   359	 * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
   360	 */
   361	static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
   362	{
   363		struct device *dev = vmw_tt->dev_priv->dev->dev;
   364	
 > 365		dma_unmap_sgtable(dev, vmw_tt->sgt, DMA_BIDIRECTIONAL, 0);
   366		vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
   367	}
   368	

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

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