linux-kernel - linux-next: build warning after merge of the akpm-current tree

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Date:   Thu, 23 Nov 2017 13:01:09 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: linux-next: build warning after merge of the akpm-current tree

Hi Andrew,

After merging the akpm-current tree, today's linux-next build (arm
multi_v7_defconfig) produced this warning:

fs/super.c: In function 'sget_userns':
fs/super.c:521:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result [-Wunused-result]
  register_shrinker(&s->s_shrink);
  ^
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);
  ^

Introduced by commit

  488251e1e892 ("mm,vmscan: mark register_shrinker() as __must_check")

Yes, I realise that it is meant to flush the users out ...

-- 
Cheers,
Stephen Rothwell