Date: Tue, 4 Apr 2017 18:44:53 +0200
From: Michal Hocko <mhocko@kernel.org>
To: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
        Tang Chen <tangchen@cn.fujitsu.com>, qiuxishi@huawei.com,
        Kani Toshimitsu <toshi.kani@hpe.com>, slaoub@gmail.com,
        Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>,
        Zhang Zhen <zhenzhang.zhang@huawei.com>,
        David Rientjes <rientjes@google.com>,
        Daniel Kiper <daniel.kiper@oracle.com>,
        Igor Mammedov <imammedo@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Chris Metcalf <cmetcalf@mellanox.com>,
        Dan Williams <dan.j.williams@gmail.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 0/6] mm: make movable onlining suck less
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On Tue 04-04-17 11:02:39, Reza Arbab wrote:
> On Tue, Apr 04, 2017 at 10:23:02AM +0200, Michal Hocko wrote:
> >diff --git a/drivers/base/node.c b/drivers/base/node.c
> >index 5548f9686016..ee080a35e869 100644
> >--- a/drivers/base/node.c
> >+++ b/drivers/base/node.c
> >@@ -368,8 +368,6 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
> >}
> >
> >#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> >-#define page_initialized(page)  (page->lru.next)
> >-
> >static int __ref get_nid_for_pfn(unsigned long pfn)
> >{
> >	struct page *page;
> >@@ -380,9 +378,6 @@ static int __ref get_nid_for_pfn(unsigned long pfn)
> >	if (system_state == SYSTEM_BOOTING)
> >		return early_pfn_to_nid(pfn);
> >#endif
> >-	page = pfn_to_page(pfn);
> >-	if (!page_initialized(page))
> >-		return -1;
> >	return pfn_to_nid(pfn);
> >}
> >
> 
> You can get rid of 'page' altogether.
> 
> drivers/base/node.c: In function ‘get_nid_for_pfn’:
> drivers/base/node.c:373:15: warning: unused variable ‘page’ [-Wunused-variable]

Right, updated.

Thanks for your testing! This is highly appreciated.
Can I assume your Tested-by?
-- 
Michal Hocko
SUSE Labs