linux-kernel - Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <xa1tha46hl1w.fsf@mina86.com>
Date:	Sat, 31 May 2014 09:02:51 +0900
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>, Gioh Kim <gioh.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used

> On Thu, May 29, 2014 at 05:09:34PM +0900, Gioh Kim wrote:
>> Is IS_ENABLED(CONFIG_CMA) necessary?
>> What about if (migratetype == MIGRATE_MOVABLE && zone->managed_cma_pages) ?

On Fri, May 30 2014, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> Yes, field, managed_cma_pages exists only if CONFIG_CMA is enabled, so
> removing IS_ENABLE(CONFIG_CMA) would break the build.

That statement makes no sense.  If zone->managed_cma_pages not being
defined is the problem, what you need is:

+#ifdef CONFIG_CMA
+	if (migratetype == MIGRATE_MOVABLE && zone->managed_cma_pages)
+		page = __rmqueue_cma(zone, order);
+#endif

If you use IS_ENABLED, zone-managed_cma_pages has to be defined
regardless of result of state of CONFIG_CMA.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/