[radeon-alex:amd-staging-dkms-4.18 790/1379] drivers/gpu/drm/ttm/ttm_bo_util.c:299:10: error: implicit declaration of function '__kcl__kmap_atomic'; did you mean '__kunmap_atomic'?

[kbuild test robot]

tree:   git://people.freedesktop.org/~agd5f/linux.git amd-staging-dkms-4.18
head:   937a0a9df97d4c1c7cecf6faa2f501d175bc3c2a
commit: 7d0741bab20cb328c2c778764efc340896242ccb [790/1379] drm/amdkcl: [RHEL 6] support kmap_atomic funciton for ttm module
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 7d0741bab20cb328c2c778764efc340896242ccb
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All error/warnings (new ones prefixed by >>):

   drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_kmap_atomic_prot':
>> drivers/gpu/drm/ttm/ttm_bo_util.c:299:10: error: implicit declaration of function '__kcl__kmap_atomic'; did you mean '__kunmap_atomic'? [-Werror=implicit-function-declaration]
      return __kcl__kmap_atomic(page);
             ^~~~~~~~~~~~~~~~~~
             __kunmap_atomic
>> drivers/gpu/drm/ttm/ttm_bo_util.c:299:10: warning: returning 'int' from a function with return type 'void *' makes pointer from integer without a cast [-Wint-conversion]
      return __kcl__kmap_atomic(page);
             ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_kunmap_atomic_prot':
>> drivers/gpu/drm/ttm/ttm_bo_util.c:315:3: error: implicit declaration of function '__kcl__kunmap_atomic'; did you mean '__kunmap_atomic'? [-Werror=implicit-function-declaration]
      __kcl__kunmap_atomic(addr);
      ^~~~~~~~~~~~~~~~~~~~
      __kunmap_atomic
   cc1: some warnings being treated as errors

vim +299 drivers/gpu/drm/ttm/ttm_bo_util.c

   280	
   281	
   282	/**
   283	 * ttm_kmap_atomic_prot - Efficient kernel map of a single page with
   284	 * specified page protection.
   285	 *
   286	 * @page: The page to map.
   287	 * @prot: The page protection.
   288	 *
   289	 * This function maps a TTM page using the kmap_atomic api if available,
   290	 * otherwise falls back to vmap. The user must make sure that the
   291	 * specified page does not have an aliased mapping with a different caching
   292	 * policy unless the architecture explicitly allows it. Also mapping and
   293	 * unmapping using this api must be correctly nested. Unmapping should
   294	 * occur in the reverse order of mapping.
   295	 */
   296	void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot)
   297	{
   298		if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
 > 299			return __kcl__kmap_atomic(page);
   300		else
   301			return __ttm_kmap_atomic_prot(page, prot);
   302	}
   303	EXPORT_SYMBOL(ttm_kmap_atomic_prot);
   304	
   305	/**
   306	 * ttm_kunmap_atomic_prot - Unmap a page that was mapped using
   307	 * ttm_kmap_atomic_prot.
   308	 *
   309	 * @addr: The virtual address from the map.
   310	 * @prot: The page protection.
   311	 */
   312	void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot)
   313	{
   314		if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
 > 315			__kcl__kunmap_atomic(addr);
   316		else
   317			__ttm_kunmap_atomic(addr);
   318	}
   319	EXPORT_SYMBOL(ttm_kunmap_atomic_prot);
   320	

---
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