linux-kernel - Re: [PATCH 7/8] pipe: account to kmemcg

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Message-ID: <20160523105718.GC7917@esperanza>
Date:	Mon, 23 May 2016 13:57:18 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Alexander Viro <viro@...iv.linux.org.uk>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] pipe: account to kmemcg

On Mon, May 23, 2016 at 06:39:40PM +0800, kbuild test robot wrote:
...
>    fs/built-in.o: In function `anon_pipe_buf_steal':
> >> pipe.c:(.text+0x5f8d): undefined reference to `memcg_kmem_uncharge'

From: Vladimir Davydov <vdavydov@...tuozzo.com>
Subject: [PATCH] pipe-account-to-kmemcg-fix


diff --git a/fs/pipe.c b/fs/pipe.c
index 6345f3543788..b3ad0b33f04e 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -144,8 +144,10 @@ static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
 	struct page *page = buf->page;
 
 	if (page_count(page) == 1) {
-		memcg_kmem_uncharge(page, 0);
-		__ClearPageKmemcg(page);
+		if (memcg_kmem_enabled()) {
+			memcg_kmem_uncharge(page, 0);
+			__ClearPageKmemcg(page);
+		}
 		__SetPageLocked(page);
 		return 0;
 	}