linux-kernel - Re: [PATCH] dma-buf: system_heap: do not warn for costly allocation

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Message-ID: <202102110537.LVdiQE6j-lkp@intel.com>
Date:   Thu, 11 Feb 2021 05:12:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Minchan Kim <minchan@...nel.org>, sumit.semwal@...aro.org,
        john.stultz@...aro.org
Cc:     kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>,
        surenb@...gle.com, hridya@...gle.com, joaodias@...gle.com,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] dma-buf: system_heap: do not warn for costly allocation

Hi Minchan,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.11-rc7 next-20210125]
[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]

url:    https://github.com/0day-ci/linux/commits/Minchan-Kim/dma-buf-system_heap-do-not-warn-for-costly-allocation/20210211-003048
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e0756cfc7d7cd08c98a53b6009c091a3f6a50be6
config: i386-randconfig-s002-20210209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-215-g0fb77bb6-dirty
        # https://github.com/0day-ci/linux/commit/28176611ddc50d5d84aa71679f32b0b22dbf4b1c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Minchan-Kim/dma-buf-system_heap-do-not-warn-for-costly-allocation/20210211-003048
        git checkout 28176611ddc50d5d84aa71679f32b0b22dbf4b1c
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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/dma-buf/heaps/system_heap.c:327:27: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned long gfp_flags @@     got restricted gfp_t @@
   drivers/dma-buf/heaps/system_heap.c:327:27: sparse:     expected unsigned long gfp_flags
   drivers/dma-buf/heaps/system_heap.c:327:27: sparse:     got restricted gfp_t
>> drivers/dma-buf/heaps/system_heap.c:329:35: sparse: sparse: invalid assignment: |=
>> drivers/dma-buf/heaps/system_heap.c:329:35: sparse:    left side has type unsigned long
>> drivers/dma-buf/heaps/system_heap.c:329:35: sparse:    right side has type restricted gfp_t
>> drivers/dma-buf/heaps/system_heap.c:331:36: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected restricted gfp_t [usertype] gfp_mask @@     got unsigned long gfp_flags @@
   drivers/dma-buf/heaps/system_heap.c:331:36: sparse:     expected restricted gfp_t [usertype] gfp_mask
   drivers/dma-buf/heaps/system_heap.c:331:36: sparse:     got unsigned long gfp_flags

vim +327 drivers/dma-buf/heaps/system_heap.c

   313	
   314	static struct page *alloc_largest_available(unsigned long size,
   315						    unsigned int max_order)
   316	{
   317		struct page *page;
   318		unsigned long gfp_flags;
   319		int i;
   320	
   321		for (i = 0; i < NUM_ORDERS; i++) {
   322			if (size <  (PAGE_SIZE << orders[i]))
   323				continue;
   324			if (max_order < orders[i])
   325				continue;
   326	
 > 327			gfp_flags = order_flags[i];
   328			if (orders[i] > PAGE_ALLOC_COSTLY_ORDER)
 > 329				gfp_flags |= __GFP_NOWARN;
   330	
 > 331			page = alloc_pages(gfp_flags, orders[i]);
   332			if (!page)
   333				continue;
   334			return page;
   335		}
   336		return NULL;
   337	}
   338	

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

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