Re: [PATCH] dma/pool: eliminate CMA alloc warning in atomic_pool_expand

[Marek Szyprowski]

On 30.10.2026 11:00, Maximilian Heyne wrote:
> atomic_pool_expand() allocates with decreasing page order first from the
> CMA and if that fails via alloc_pages(). If the cma allocation fails a
> warning, such as the following, is printed:
>
>   cma: __cma_alloc_frozen: reserved: alloc failed, req-size: 4096 pages, ret: -16
>   cma: number of available pages:
>   cma: range 0: 1024@0
>   cma:
>   => 1024 free of 1024 total pages
>   DMA: preallocated 262144 KiB GFP_KERNEL pool for atomic allocations
>
> In this case the allocation succeeded via alloc_pages and therefore,
> printing the warning is not necessary. Therefore, similar to commit
> 463d439becb8 ("dma/pool: eliminate alloc_pages warning in
> atomic_pool_expand") silence the warning also for the CMA attempt.
>
> Fixes: d7e673ec2c8e ("dma-pool: Only allocate from CMA when in same memory zone")
> Signed-off-by: Maximilian Heyne <mheyne@xxxxxxxxx>

Applied to dma-mapping-for-next. Thanks!

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland