From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-la0-f51.google.com (mail-la0-f51.google.com [209.85.215.51]) by kanga.kvack.org (Postfix) with ESMTP id 4917B6B00DC for ; Tue, 6 Jan 2015 12:21:26 -0500 (EST) Received: by mail-la0-f51.google.com with SMTP id ms9so20120124lab.24 for ; Tue, 06 Jan 2015 09:21:24 -0800 (PST) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id j2si30502909wiz.3.2015.01.06.09.21.23 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 06 Jan 2015 09:21:23 -0800 (PST) Message-ID: <54AC1991.9060908@suse.cz> Date: Tue, 06 Jan 2015 18:21:21 +0100 From: Vlastimil Babka MIME-Version: 1.0 Subject: Re: [PATCH 1/1 linux-next] mm,compaction: move suitable_migration_target() under CONFIG_COMPACTION References: <1420301068-19447-1-git-send-email-fabf@skynet.be> In-Reply-To: <1420301068-19447-1-git-send-email-fabf@skynet.be> Content-Type: text/plain; charset=iso-8859-2 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Fabian Frederick , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org On 01/03/2015 05:04 PM, Fabian Frederick wrote: > suitable_migration_target() is only used by isolate_freepages() > Define it under CONFIG_COMPACTION || CONFIG_CMA is not needed. > > Fix the following warning: > mm/compaction.c:311:13: warning: 'suitable_migration_target' defined > but not used [-Wunused-function] > > Signed-off-by: Fabian Frederick I agree, I would just move it to the section where isolation_suitable() and related others are, maybe at the end of this section below update_pageblock_skip()? Vlastimil > --- > mm/compaction.c | 44 ++++++++++++++++++++++---------------------- > 1 file changed, 22 insertions(+), 22 deletions(-) > > diff --git a/mm/compaction.c b/mm/compaction.c > index 546e571..38b151c 100644 > --- a/mm/compaction.c > +++ b/mm/compaction.c > @@ -307,28 +307,6 @@ static inline bool compact_should_abort(struct compact_control *cc) > return false; > } > > -/* Returns true if the page is within a block suitable for migration to */ > -static bool suitable_migration_target(struct page *page) > -{ > - /* If the page is a large free page, then disallow migration */ > - if (PageBuddy(page)) { > - /* > - * We are checking page_order without zone->lock taken. But > - * the only small danger is that we skip a potentially suitable > - * pageblock, so it's not worth to check order for valid range. > - */ > - if (page_order_unsafe(page) >= pageblock_order) > - return false; > - } > - > - /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */ > - if (migrate_async_suitable(get_pageblock_migratetype(page))) > - return true; > - > - /* Otherwise skip the block */ > - return false; > -} > - > /* > * Isolate free pages onto a private freelist. If @strict is true, will abort > * returning 0 on any invalid PFNs or non-free pages inside of the pageblock > @@ -802,6 +780,28 @@ isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn, > > #endif /* CONFIG_COMPACTION || CONFIG_CMA */ > #ifdef CONFIG_COMPACTION > +/* Returns true if the page is within a block suitable for migration to */ > +static bool suitable_migration_target(struct page *page) > +{ > + /* If the page is a large free page, then disallow migration */ > + if (PageBuddy(page)) { > + /* > + * We are checking page_order without zone->lock taken. But > + * the only small danger is that we skip a potentially suitable > + * pageblock, so it's not worth to check order for valid range. > + */ > + if (page_order_unsafe(page) >= pageblock_order) > + return false; > + } > + > + /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */ > + if (migrate_async_suitable(get_pageblock_migratetype(page))) > + return true; > + > + /* Otherwise skip the block */ > + return false; > +} > + > /* > * Based on information in the current compact_control, find blocks > * suitable for isolating free pages from and then isolate them. > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org