From: kbuild test robot <fengguang.wu@intel.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: kbuild-all@01.org, Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [mmotm:master 51/95] drivers/gpu/drm/ttm/ttm_page_alloc.c:451:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result
Date: Wed, 22 Nov 2017 11:39:02 +0800 [thread overview]
Message-ID: <201711221159.FF6CRNDf%fengguang.wu@intel.com> (raw)
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tree: git://git.cmpxchg.org/linux-mmotm.git master
head: f5ef1cb6700e8b570adae945b1e0bd4ab95d8a26
commit: a58c5788f373a7a45532d5b02ae3b0173d4273e7 [51/95] mm,vmscan: mark register_shrinker() as __must_check
config: i386-randconfig-i1-201747 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
git checkout a58c5788f373a7a45532d5b02ae3b0173d4273e7
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
drivers/gpu/drm/ttm/ttm_page_alloc.c: In function 'ttm_pool_mm_shrink_init':
>> drivers/gpu/drm/ttm/ttm_page_alloc.c:451:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result [-Wunused-result]
register_shrinker(&manager->mm_shrink);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c: In function 'ttm_dma_pool_mm_shrink_init':
>> drivers/gpu/drm/ttm/ttm_page_alloc_dma.c:1185:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result [-Wunused-result]
register_shrinker(&manager->mm_shrink);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/register_shrinker +451 drivers/gpu/drm/ttm/ttm_page_alloc.c
1403b1a3 Pauli Nieminen 2010-04-01 445
1403b1a3 Pauli Nieminen 2010-04-01 446 static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager)
1403b1a3 Pauli Nieminen 2010-04-01 447 {
7dc19d5a Dave Chinner 2013-08-28 448 manager->mm_shrink.count_objects = ttm_pool_shrink_count;
7dc19d5a Dave Chinner 2013-08-28 449 manager->mm_shrink.scan_objects = ttm_pool_shrink_scan;
1403b1a3 Pauli Nieminen 2010-04-01 450 manager->mm_shrink.seeks = 1;
1403b1a3 Pauli Nieminen 2010-04-01 @451 register_shrinker(&manager->mm_shrink);
1403b1a3 Pauli Nieminen 2010-04-01 452 }
1403b1a3 Pauli Nieminen 2010-04-01 453
:::::: The code at line 451 was first introduced by commit
:::::: 1403b1a38e8b19a4cc17e2c158e278628943a436 drm/ttm: add pool wc/uc page allocator V3
:::::: TO: Pauli Nieminen <suokkos@gmail.com>
:::::: CC: Dave Airlie <airlied@redhat.com>
---
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