linux-kernel - Re: [RFC v3 PATCH 1/5] mm/page_alloc: use helper functions to add/remove a page to/from buddy

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Message-ID: <20180517115327.GB26689@bombadil.infradead.org>
Date:   Thu, 17 May 2018 04:53:27 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Aaron Lu <aaron.lu@...el.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Huang Ying <ying.huang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Kemi Wang <kemi.wang@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [RFC v3 PATCH 1/5] mm/page_alloc: use helper functions to
 add/remove a page to/from buddy

On Thu, May 17, 2018 at 04:48:21AM -0700, Matthew Wilcox wrote:
> On Wed, May 09, 2018 at 04:54:46PM +0800, Aaron Lu wrote:
> > +static inline void add_to_buddy_head(struct page *page, struct zone *zone,
> > +					unsigned int order, int mt)
> > +{
> > +	add_to_buddy_common(page, zone, order);
> > +	list_add(&page->lru, &zone->free_area[order].free_list[mt]);
> > +}
> 
> Isn't this function (and all of its friends) misnamed?  We're not adding
> this page to the buddy allocator, we're adding it to the freelist.  It
> doesn't go to the buddy allocator until later, if at all.

No, never mind, I misunderstood.  Ignore this please.