Re: [PATCH] mm: optimization on page allocation when CMA enabled

[kernel test robot <lkp@intel.com>]

Hi zhaoyang.huang,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/zhaoyang-huang/mm-optimization-on-page-allocation-when-CMA-enabled/20230428-190140
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/1682679641-13652-1-git-send-email-zhaoyang.huang%40unisoc.com
patch subject: [PATCH] mm: optimization on page allocation when CMA enabled
config: alpha-randconfig-r014-20230428 (https://download.01.org/0day-ci/archive/20230428/202304282118.os2SZpZS-lkp@intel.com/config)
compiler: alpha-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/dbda57eee661a0c9b47f23720bcc9741495d00a5
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review zhaoyang-huang/mm-optimization-on-page-allocation-when-CMA-enabled/20230428-190140
        git checkout dbda57eee661a0c9b47f23720bcc9741495d00a5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=alpha olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304282118.os2SZpZS-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/page_alloc.c: In function '__rmqueue':
>> mm/page_alloc.c:2328:42: error: implicit declaration of function '__if_use_cma_first' [-Werror=implicit-function-declaration]
    2328 |                         bool cma_first = __if_use_cma_first(zone, order, alloc_flags);
         |                                          ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/__if_use_cma_first +2328 mm/page_alloc.c

  2277	
  2278	#ifdef CONFIG_CMA
  2279	static bool __if_use_cma_first(struct zone *zone, unsigned int order, unsigned int alloc_flags)
  2280	{
  2281		unsigned long cma_proportion = 0;
  2282		unsigned long cma_free_proportion = 0;
  2283		unsigned long watermark = 0;
  2284		unsigned long wm_fact[ALLOC_WMARK_MASK] = {1, 1, 2};
  2285		long count = 0;
  2286		bool cma_first = false;
  2287	
  2288		watermark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK);
  2289		/*check if GFP_MOVABLE pass previous watermark check via the help of CMA*/
  2290		if (!zone_watermark_ok(zone, order, watermark, 0, alloc_flags & (~ALLOC_CMA)))
  2291		{
  2292			alloc_flags &= ALLOC_WMARK_MASK;
  2293			/* WMARK_LOW failed lead to using cma first, this helps U&R stay
  2294			 * around low when being drained by GFP_MOVABLE
  2295			 */
  2296			if (alloc_flags <= ALLOC_WMARK_LOW)
  2297				cma_first = true;
  2298			/*check proportion for WMARK_HIGH*/
  2299			else {
  2300				count = atomic_long_read(&zone->managed_pages);
  2301				cma_proportion = zone->cma_pages * 100 / count;
  2302				cma_free_proportion = zone_page_state(zone, NR_FREE_CMA_PAGES) * 100
  2303					/  zone_page_state(zone, NR_FREE_PAGES);
  2304				cma_first = (cma_free_proportion >= wm_fact[alloc_flags] * cma_proportion
  2305						|| cma_free_proportion >= 50);
  2306			}
  2307		}
  2308		return cma_first;
  2309	}
  2310	#endif
  2311	/*
  2312	 * Do the hard work of removing an element from the buddy allocator.
  2313	 * Call me with the zone->lock already held.
  2314	 */
  2315	static __always_inline struct page *
  2316	__rmqueue(struct zone *zone, unsigned int order, int migratetype,
  2317							unsigned int alloc_flags)
  2318	{
  2319		struct page *page;
  2320	
  2321		if (IS_ENABLED(CONFIG_CMA)) {
  2322			/*
  2323			 * Balance movable allocations between regular and CMA areas by
  2324			 * allocating from CMA when over half of the zone's free memory
  2325			 * is in the CMA area.
  2326			 */
  2327			if (migratetype == MIGRATE_MOVABLE) {
> 2328				bool cma_first = __if_use_cma_first(zone, order, alloc_flags);
  2329				page = cma_first ? __rmqueue_cma_fallback(zone, order) : NULL;
  2330				if (page)
  2331					return page;
  2332			}
  2333		}
  2334	retry:
  2335		page = __rmqueue_smallest(zone, order, migratetype);
  2336		if (unlikely(!page)) {
  2337			if (alloc_flags & ALLOC_CMA)
  2338				page = __rmqueue_cma_fallback(zone, order);
  2339	
  2340			if (!page && __rmqueue_fallback(zone, order, migratetype,
  2341									alloc_flags))
  2342				goto retry;
  2343		}
  2344		return page;
  2345	}
  2346	

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https://github.com/intel/lkp-tests