Default atomic_pool_size value & changing it

[Rafał Miłecki]

On 15 November 2016 at 22:37, Russell King - ARM Linux
<linux at armlinux.org.uk> wrote:
> On Tue, Nov 15, 2016 at 10:15:51PM +0100, Rafał Miłecki wrote:
>> I've hit problem with allocating enough coherent DMA memory. Obviously
>> there is a limit of this memory as pointed by:
>> [ 0.283667] DMA: preallocated 256 KiB pool for atomic coherent allocations
>
> This is for _atomic_ coherent allocations, not for normal coherent
> allocations.  Normal coherent allocations come from the CMA memory.
> Make sure you have CMA enabled, and you have enough of it.
>
> Boot with cma=xxxMB with xxx set appropriately.

Oh, that definitely sounds like worth trying
# CONFIG_CMA is not set
thanks for pointing it to me!

-- 
Rafał