Hi Christian,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next linus/master v6.1-rc4 next-20221108]
[cannot apply to drm-tip/drm-tip]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Christian-K-nig/drm-ttm-optimize-pool-allocations-a-bit/20221108-040029
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20221107195808.1873-1-christian.koenig%40amd.com
patch subject: [PATCH] drm/ttm: optimize pool allocations a bit
config: s390-allyesconfig
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/ec55cfc840243dd3cd0d0a02ce9ae54b8b474c4d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Christian-K-nig/drm-ttm-optimize-pool-allocations-a-bit/20221108-040029
        git checkout ec55cfc840243dd3cd0d0a02ce9ae54b8b474c4d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/gpu/drm/ttm/

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/ttm/ttm_pool.c:348:5: warning: no previous prototype for 'ttm_pool_page_allocated' [-Wmissing-prototypes]
     348 | int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
         |     ^~~~~~~~~~~~~~~~~~~~~~~


vim +/ttm_pool_page_allocated +348 drivers/gpu/drm/ttm/ttm_pool.c

   346	
   347	/* Called when we got a page, either from a pool or newly allocated */
 > 348	int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
   349				    struct page *p, dma_addr_t **dma_addr,
   350				    unsigned long *num_pages, struct page ***pages)
   351	{
   352		unsigned int i;
   353		int r;
   354	
   355		if (*dma_addr) {
   356			r = ttm_pool_map(pool, order, p, dma_addr);
   357			if (r)
   358				return r;
   359		}
   360	
   361		*num_pages -= 1 << order;
   362		for (i = 1 << order; i; --i)
   363			*((*pages)++) = p++;
   364	
   365		return 0;
   366	}
   367	

-- 
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https://01.org/lkp