linux-kernel - Re: dma_alloc

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Message-ID: <20070601213129.GC5400@flint.arm.linux.org.uk>
Date:	Fri, 1 Jun 2007 22:31:30 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Maximus <john.maximus@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: dma_alloc_coherent fails

On Fri, Jun 01, 2007 at 10:16:41PM +0530, Maximus wrote:
> Hi,
> Am using a linux 2.6.19 kernel for arm. the dma_alloc_coherent
> function call in the kernel for 38400 bytes fails.
> 
> Has anyone faced this problem before?.
> 
> What could be make dma_alloc_coherent to success sometimes and fail 
> sometimes?.

Memory fragmentation.  Large allocations (> 1 page) are always unreliable.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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