linux-kernel - Re: [PATCH 11/14] mm, memory_hotplug: do not associate hotadded memory to zones until online

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Date:   Fri, 16 Jun 2017 10:05:02 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 11/14] mm, memory_hotplug: do not associate hotadded
 memory to zones until online

[Please try to trim the context you are replying to]

On Fri 16-06-17 12:20:58, Wei Yang wrote:
> On Mon, May 15, 2017 at 10:58:24AM +0200, Michal Hocko wrote:
[...]
> > /*
> >+ * Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty
> >+ * intersection with the given zone
> >+ */
> >+static inline bool zone_intersects(struct zone *zone,
> >+		unsigned long start_pfn, unsigned long nr_pages)
> >+{
> >+	if (zone_is_empty(zone))
> >+		return false;
> >+	if (start_pfn >= zone_end_pfn(zone))
> >+		return false;
> >+
> >+	if (zone->zone_start_pfn <= start_pfn)
> >+		return true;
> >+	if (start_pfn + nr_pages > zone->zone_start_pfn)
> >+		return true;
> >+
> >+	return false;
> >+}
> 
> I think this could be simplified as:
> 
> static inline bool zone_intersects(struct zone *zone,
> 		unsigned long start_pfn, unsigned long nr_pages)
> {
> 	if (zone_is_empty(zone))
> 		return false;
> 
> 	if (start_pfn >= zone_end_pfn(zone) ||
> 	    start_pfn + nr_pages <= zone->zone_start_pfn)
> 		return false;
> 
> 	return true;
> }

Feel free to send a patch.
-- 
Michal Hocko
SUSE Labs