Re: [PATCH v2] MIPS: fix DMA contiguous allocation

[Mel Gorman]

On Wed, Dec 09, 2015 at 02:54:05PM +0000, Qais Yousef wrote:
> Recent changes to how GFP_ATOMIC is defined seems to have broken the condition
> to use mips_alloc_from_contiguous() in mips_dma_alloc_coherent().
> 
> I couldn't bottom out the exact change but I think it's this one
> 
> d0164adc89f6 (mm, page_alloc: distinguish between being unable to sleep,
> unwilling to sleep and avoiding waking kswapd)
> 
> From what I see GFP_ATOMIC has multiple bits set and the check for !(gfp
> & GFP_ATOMIC) isn't enough.
> 
> The reason behind this condition is to check whether we can potentially do
> a sleeping memory allocation. Use gfpflags_allow_blocking() instead which
> should be more robust.
> 
> Signed-off-by: Qais Yousef <qais.yousef@xxxxxxxxxx>

Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>

-- 
Mel Gorman
SUSE Labs
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