linux-kernel - Re: [PATCH v2 3/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging

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Message-ID: <a034e2c3-8933-caba-a113-ca08372da2b9@arm.com>
Date:   Wed, 21 Nov 2018 17:43:44 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Christopher Lameter <cl@...ux.com>,
        Will Deacon <will.deacon@....com>
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Joerg Roedel <joro@...tes.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Levin Alexander <Alexander.Levin@...rosoft.com>,
        Huaisheng Ye <yehs1@...ovo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Yong Wu <yong.wu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>, yingjoe.chen@...iatek.com
Subject: Re: [PATCH v2 3/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory,
 and improve debugging

On 21/11/2018 17:38, Christopher Lameter wrote:
> On Wed, 21 Nov 2018, Will Deacon wrote:
> 
>>> +#define ARM_V7S_TABLE_SLAB_CACHE SLAB_CACHE_DMA32
> 
> SLAB_CACHE_DMA32??? WTH is going on here? We are trying to get rid of
> the dma slab array.

See the previous two patches in this series. If there's already a 
(better) way to have a kmem_cache which allocates its backing pages with 
GFP_DMA32, please do let us know.

Robin.