linux-kernel - Re: [PATCH v2 4/4] ARC: don't check for HIGHMEM pages in arch_dma

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Message-ID: <20180731080857.GB23303@lst.de>
Date:   Tue, 31 Jul 2018 10:08:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>, hch@....de
Subject: Re: [PATCH v2 4/4] ARC: don't check for HIGHMEM pages in
        arch_dma_alloc

On Mon, Jul 30, 2018 at 07:26:36PM +0300, Eugeniy Paltsev wrote:
> __GFP_HIGHMEM flag is cleared by upper layer functions
> (in include/linux/dma-mapping.h) so we'll never get a
> __GFP_HIGHMEM flag in arch_dma_alloc gfp argument.
> That's why alloc_pages will never return highmem page
> here.
> 
> Get rid of highmem pages handling and cleanup arch_dma_alloc
> and arch_dma_free functions.
> 
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>