From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1526803045; cv=none; d=google.com; s=arc-20160816; b=qlXQcnxYV1c9OJYajs3v6VJuqe20dOA8M01a1Bn2JSjkhlh0NT2dGaZlQpxG44OoQT S5xPA2TYj/LJCNAdIFQANEiVuyCnJd/6kyIrTAsOX7JqICYxgjNPElQuRIKmf/E9F7oz kn5+UCKfG/MPrhZRBZP9bBY8U9xZcJf3F8lF9zYgh30FjIu19cZuadqxSXt0Q6qkUh8n qA539OV1EiplnQxcOLkS/msoBP+heqjGbR/rISXc0KO5p3tLP9LLc60QhoveHsrfqNHH f5r+FK25qkk31xQ1NhqZPV8OEUvuvo5WrJp1jOE/RX1eRa9caoWxM+CClHgayBtDg+66 seRw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:dkim-signature:arc-authentication-results; bh=0zsMSR6kJEgNU/dNslzPV/LIvOPSffcDo3AlUq9s7xo=; b=Ph6isJGcfQVNreSogmmONh8DS/pjXC08VBTT9s1DBm5hJgLm8f9vmhi19x6TPTMYYJ u3KEk+DOdA/jE6Q5leMYe7Ybl1BHrwSlpe/91yKvAWG2bKaEyKe0urN94xefAJEBPzZ0 Cv26HQdDWPnsAnsMAm7tIogbRyFpQkGkyLcfYEEnhYA5p19p2LV+TrZyF9n9yrV5zf9Y nLh9nnCvfUBxRGLANYICsKgWylyc0oYxCdfCOwZJpvah0eTgtyDQNd/a+JE1Dic8/FaU arjGS1z7+AOUhgIpCVeeCpZqnC5FZsDnSTNz9jRN4aZT3yqkY9d5HZuUPiX0bEf5I49o uC5w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=MwiAEQTt; spf=pass (google.com: domain of vdavydov.dev@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=vdavydov.dev@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=MwiAEQTt; spf=pass (google.com: domain of vdavydov.dev@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=vdavydov.dev@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AB8JxZpcOsaOZXoyzhKoA6UcM/X7tiYLRD8FiBGSzSduwslMH9Fa/5+F40Tjr1rKpc56cJTWNKnfjA== Date: Sun, 20 May 2018 10:57:22 +0300 From: Vladimir Davydov To: Kirill Tkhai Cc: akpm@linux-foundation.org, shakeelb@google.com, viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org, tglx@linutronix.de, pombredanne@nexb.com, stummala@codeaurora.org, gregkh@linuxfoundation.org, sfr@canb.auug.org.au, guro@fb.com, mka@chromium.org, penguin-kernel@I-love.SAKURA.ne.jp, chris@chris-wilson.co.uk, longman@redhat.com, minchan@kernel.org, ying.huang@intel.com, mgorman@techsingularity.net, jbacik@fb.com, linux@roeck-us.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, lirongqing@baidu.com, aryabinin@virtuozzo.com Subject: Re: [PATCH v6 13/17] mm: Export mem_cgroup_is_root() Message-ID: <20180520075722.qwwrxuz52kqulsnw@esperanza> References: <152663268383.5308.8660992135988724014.stgit@localhost.localdomain> <152663303322.5308.13190345531934617119.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <152663303322.5308.13190345531934617119.stgit@localhost.localdomain> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1600790764385859486?= X-GMAIL-MSGID: =?utf-8?q?1600969030236752143?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Fri, May 18, 2018 at 11:43:53AM +0300, Kirill Tkhai wrote: > This will be used in next patch. > > Signed-off-by: Kirill Tkhai > --- > include/linux/memcontrol.h | 10 ++++++++++ > mm/memcontrol.c | 5 ----- > 2 files changed, 10 insertions(+), 5 deletions(-) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > index 7ae1b94becf3..cd44c1fac22b 100644 > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -311,6 +311,11 @@ struct mem_cgroup { > > extern struct mem_cgroup *root_mem_cgroup; > > +static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) > +{ > + return (memcg == root_mem_cgroup); > +} > + > static inline bool mem_cgroup_disabled(void) > { > return !cgroup_subsys_enabled(memory_cgrp_subsys); > @@ -780,6 +785,11 @@ void mem_cgroup_split_huge_fixup(struct page *head); > > struct mem_cgroup; > > +static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) > +{ > + return false; > +} > + This stub must return true as one can think of !MEMCG as of the case when there's the only cgroup - the root.