linux-kernel - Re: [PATCH] mm/slab: kmalloc with GFP_DMA32 allocate from SLAB_CACHE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210312092938.GA2412021@infradead.org>
Date:   Fri, 12 Mar 2021 09:29:38 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Jianqun Xu <jay.xu@...k-chips.com>
Cc:     cl@...ux.co, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] mm/slab: kmalloc with GFP_DMA32 allocate from
 SLAB_CACHE_DMA32

On Fri, Mar 12, 2021 at 04:03:20PM +0800, Jianqun Xu wrote:
> The flag GFP_DMA32 only effect in kmalloc_large currently.
> 
> This patch will create caches with GFP_DMA32 to support kmalloc with
> size under KMALLOC_MAX_CACHE_SIZE.

No.  No new code should use GFP_DMA32, never mind through slab.
Please use the proper DMA APIs for your addressing needs.