linux-kernel - Re: [PATCH 2/3] dma-pool: don't return errors from dma_atomic_pool

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Date:   Wed, 17 Aug 2022 13:36:48 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux.dev,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dma-pool: don't return errors from
 dma_atomic_pool_init

On 2022-08-17 07:06, Christoph Hellwig wrote:
> Returning errors from initcalls does not change a thing, thus don't
> bother with returning -ENOMEM if one of the pool allocations failed.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   kernel/dma/pool.c | 10 +---------
>   1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 56f96678934bf..5b07b0379a501 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -195,8 +195,6 @@ static unsigned long calculate_pool_size(unsigned long zone_pages)
>   
>   static int __init dma_atomic_pool_init(void)
>   {
> -	int ret = 0;
> -
>   	/*
>   	 * If coherent_pool was not used on the command line, default the pool
>   	 * sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1.
> @@ -208,23 +206,17 @@ static int __init dma_atomic_pool_init(void)
>   
>   	atomic_pool_kernel = __dma_atomic_pool_init(atomic_pool_size,
>   						    GFP_KERNEL);
> -	if (!atomic_pool_kernel)
> -		ret = -ENOMEM;
>   	if (has_managed_dma()) {
>   		atomic_pool_dma = __dma_atomic_pool_init(atomic_pool_size,
>   						GFP_KERNEL | GFP_DMA);
> -		if (!atomic_pool_dma)
> -			ret = -ENOMEM;
>   	}
>   	if (IS_ENABLED(CONFIG_ZONE_DMA32)) {
>   		atomic_pool_dma32 = __dma_atomic_pool_init(atomic_pool_size,
>   						GFP_KERNEL | GFP_DMA32);
> -		if (!atomic_pool_dma32)
> -			ret = -ENOMEM;
>   	}
>   
>   	dma_atomic_pool_debugfs_init();
> -	return ret;
> +	return 0;
>   }
>   postcore_initcall(dma_atomic_pool_init);
>