* dma_alloc_coherent fails
@ 2007-06-01 16:46 Maximus
2007-06-01 21:31 ` Russell King
0 siblings, 1 reply; 2+ messages in thread
From: Maximus @ 2007-06-01 16:46 UTC (permalink / raw)
To: linux-kernel
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?.
Regards,
John
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: dma_alloc_coherent fails
2007-06-01 16:46 dma_alloc_coherent fails Maximus
@ 2007-06-01 21:31 ` Russell King
0 siblings, 0 replies; 2+ messages in thread
From: Russell King @ 2007-06-01 21:31 UTC (permalink / raw)
To: Maximus; +Cc: linux-kernel
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:
^ permalink raw reply [flat|nested] 2+ messages in thread
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