linux-kernel - Re: [PATCH v2 2/3] mm: Add support for SLAB_CACHE

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Message-ID: <01000167378bf31a-a639b46c-4d1d-43de-9bed-9cdd9c07fa94-000000@email.amazonses.com>
Date:   Wed, 21 Nov 2018 18:32:58 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
cc:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        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 2/3] mm: Add support for SLAB_CACHE_DMA32

On Sun, 11 Nov 2018, Nicolas Boichat wrote:

> SLAB_CACHE_DMA32 is only available after explicit kmem_cache_create calls,
> no default cache is created for kmalloc. Add a test in check_slab_flags
> for this.

This does not define the dma32 kmalloc array. Is that intentional? In that
case you need to fail any request for GFP_DMA32 coming in via kmalloc.