From: Michal Nazarewicz <mina86@mina86.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Minchan Kim <minchan@kernel.org>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Paolo Bonzini <pbonzini@redhat.com>, Gleb Natapov <gleb@kernel.org>,
        Alexander Graf <agraf@suse.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v2 08/10] mm, cma: clean-up cma allocation error path
In-Reply-To: <1402543307-29800-9-git-send-email-iamjoonsoo.kim@lge.com>
Organization: http://mina86.com/
References: <1402543307-29800-1-git-send-email-iamjoonsoo.kim@lge.com> <1402543307-29800-9-git-send-email-iamjoonsoo.kim@lge.com>
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Date: Thu, 12 Jun 2014 13:34:27 +0200
Message-ID: <xa1tzjhiicos.fsf@mina86.com>
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Sender: linux-kernel-owner@vger.kernel.org

On Thu, Jun 12 2014, Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
> We can remove one call sites for clear_cma_bitmap() if we first
> call it before checking error number.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Reviewed-by: Michal Nazarewicz <mina86@mina86.com>

> diff --git a/mm/cma.c b/mm/cma.c
> index 1e1b017..01a0713 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -282,11 +282,12 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
>  		if (ret == 0) {
>  			page = pfn_to_page(pfn);
>  			break;
> -		} else if (ret != -EBUSY) {
> -			clear_cma_bitmap(cma, pfn, count);
> -			break;
>  		}
> +
>  		clear_cma_bitmap(cma, pfn, count);
> +		if (ret != -EBUSY)
> +			break;
> +
>  		pr_debug("%s(): memory range at %p is busy, retrying\n",
>  			 __func__, pfn_to_page(pfn));
>  		/* try again with a bit different memory target */

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@google.com>--<xmpp:mina86@jabber.org>--ooO--(_)--Ooo--
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