drivers/gpu/drm/drm_gem_shmem_helper.c:261:17: error: implicit declaration of function 'pgprot_writecombine'

[kbuild test robot]

Hi Thomas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   26dca6dbd62d74a5012cafab6b2d6d65a01ea69c
commit: 08b22f65b309649057edfbae1d8772b04210b486 drm/udl: Switch to SHMEM
date:   3 months ago
config: m68k-randconfig-a001-20200201 (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 08b22f65b309649057edfbae1d8772b04210b486
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   drivers/gpu/drm/drm_gem_shmem_helper.c: In function 'drm_gem_shmem_vmap_locked':
>> drivers/gpu/drm/drm_gem_shmem_helper.c:261:17: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
            VM_MAP, pgprot_writecombine(PAGE_KERNEL));
                    ^~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/drm_gem_shmem_helper.c:261:17: error: incompatible type for argument 4 of 'vmap'
   In file included from include/asm-generic/io.h:887:0,
                    from arch/m68k/include/asm/io.h:11,
                    from arch/m68k/include/asm/pgtable_no.h:14,
                    from arch/m68k/include/asm/pgtable.h:3,
                    from include/linux/mm.h:99,
                    from include/linux/scatterlist.h:8,
                    from include/linux/dma-buf.h:18,
                    from drivers/gpu/drm/drm_gem_shmem_helper.c:6:
   include/linux/vmalloc.h:119:14: note: expected 'pgprot_t {aka struct <anonymous>}' but argument is of type 'int'
    extern void *vmap(struct page **pages, unsigned int count,
                 ^~~~
   drivers/gpu/drm/drm_gem_shmem_helper.c: In function 'drm_gem_shmem_mmap':
>> drivers/gpu/drm/drm_gem_shmem_helper.c:540:20: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
     vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
                       ^
   cc1: some warnings being treated as errors

vim +/pgprot_writecombine +261 drivers/gpu/drm/drm_gem_shmem_helper.c

2194a63a818db7 Noralf Trønnes  2019-03-12  244  
2194a63a818db7 Noralf Trønnes  2019-03-12  245  static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem)
2194a63a818db7 Noralf Trønnes  2019-03-12  246  {
2194a63a818db7 Noralf Trønnes  2019-03-12  247  	struct drm_gem_object *obj = &shmem->base;
2194a63a818db7 Noralf Trønnes  2019-03-12  248  	int ret;
2194a63a818db7 Noralf Trønnes  2019-03-12  249  
2194a63a818db7 Noralf Trønnes  2019-03-12  250  	if (shmem->vmap_use_count++ > 0)
2194a63a818db7 Noralf Trønnes  2019-03-12  251  		return shmem->vaddr;
2194a63a818db7 Noralf Trønnes  2019-03-12  252  
2194a63a818db7 Noralf Trønnes  2019-03-12  253  	ret = drm_gem_shmem_get_pages(shmem);
2194a63a818db7 Noralf Trønnes  2019-03-12  254  	if (ret)
2194a63a818db7 Noralf Trønnes  2019-03-12  255  		goto err_zero_use;
2194a63a818db7 Noralf Trønnes  2019-03-12  256  
2194a63a818db7 Noralf Trønnes  2019-03-12  257  	if (obj->import_attach)
2194a63a818db7 Noralf Trønnes  2019-03-12  258  		shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
2194a63a818db7 Noralf Trønnes  2019-03-12  259  	else
be7d9f05c53e6f Boris Brezillon 2019-05-29  260  		shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
be7d9f05c53e6f Boris Brezillon 2019-05-29 @261  				    VM_MAP, pgprot_writecombine(PAGE_KERNEL));
2194a63a818db7 Noralf Trønnes  2019-03-12  262  
2194a63a818db7 Noralf Trønnes  2019-03-12  263  	if (!shmem->vaddr) {
2194a63a818db7 Noralf Trønnes  2019-03-12  264  		DRM_DEBUG_KMS("Failed to vmap pages\n");
2194a63a818db7 Noralf Trønnes  2019-03-12  265  		ret = -ENOMEM;
2194a63a818db7 Noralf Trønnes  2019-03-12  266  		goto err_put_pages;
2194a63a818db7 Noralf Trønnes  2019-03-12  267  	}
2194a63a818db7 Noralf Trønnes  2019-03-12  268  
2194a63a818db7 Noralf Trønnes  2019-03-12  269  	return shmem->vaddr;
2194a63a818db7 Noralf Trønnes  2019-03-12  270  
2194a63a818db7 Noralf Trønnes  2019-03-12  271  err_put_pages:
2194a63a818db7 Noralf Trønnes  2019-03-12  272  	drm_gem_shmem_put_pages(shmem);
2194a63a818db7 Noralf Trønnes  2019-03-12  273  err_zero_use:
2194a63a818db7 Noralf Trønnes  2019-03-12  274  	shmem->vmap_use_count = 0;
2194a63a818db7 Noralf Trønnes  2019-03-12  275  
2194a63a818db7 Noralf Trønnes  2019-03-12  276  	return ERR_PTR(ret);
2194a63a818db7 Noralf Trønnes  2019-03-12  277  }
2194a63a818db7 Noralf Trønnes  2019-03-12  278  

:::::: The code at line 261 was first introduced by commit
:::::: be7d9f05c53e6fc88525f8e55cf2dae937761799 drm/gem_shmem: Use a writecombine mapping for ->vaddr

:::::: TO: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
:::::: CC: Rob Herring <robh@xxxxxxxxxx>

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