linux-kernel - Re: [PATCH] drivers: cma: don't fail if migration returns -EAGAIN

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Message-ID: <20120510151427.GB2394@barrios>
Date:	Fri, 11 May 2012 00:14:27 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	Michal Nazarewicz <mina86@...a86.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Mel Gorman <mel@....ul.ie>, Arnd Bergmann <arnd@...db.de>,
	Jesse Barker <jesse.barker@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	Rob Clark <rob.clark@...aro.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Sandeep Patil <psandeep.s@...il.com>
Subject: Re: [PATCH] drivers: cma: don't fail if migration returns -EAGAIN

On Thu, May 10, 2012 at 03:19:35PM +0200, Marek Szyprowski wrote:
> alloc_contig_range() function might return -EAGAIN if migrate_pages() call

migrate_page never return -EAGAIN and I can't find any -EAGAIN return in alloc_contig_range.
Am I seeing different tree? 

> fails for some temporarily locked pages. Such case should not be fatal
> to dma_alloc_from_contiguous(), which should retry allocation like in case
> of -EBUSY error.
> 
> Reported-by: Haojian Zhuang <haojian.zhuang@...il.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/base/dma-contiguous.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> index 78efb03..e46e2fb 100644
> --- a/drivers/base/dma-contiguous.c
> +++ b/drivers/base/dma-contiguous.c
> @@ -346,7 +346,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
>  		if (ret == 0) {
>  			bitmap_set(cma->bitmap, pageno, count);
>  			break;
> -		} else if (ret != -EBUSY) {
> +		} else if (ret != -EBUSY && ret != -EAGAIN) {
>  			goto error;
>  		}
>  		pr_debug("%s(): memory range at %p is busy, retrying\n",
> -- 
> 1.7.1.569.g6f426
> 
> --
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