linux-kernel - Re: [PATCH v7 1/9] crypto: caam - allocate RNG instantiation descriptor with GFP

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Message-ID: <CAHQ1cqGZP5RKTsc4+jikyPVggt-mGViRtKNvyOx9FGkYW9pgmg@mail.gmail.com>
Date:   Sun, 15 Mar 2020 21:14:49 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Horia Geanta <horia.geanta@....com>
Cc:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Iuliana Prodan <iuliana.prodan@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/9] crypto: caam - allocate RNG instantiation
 descriptor with GFP_DMA

On Tue, Feb 4, 2020 at 6:08 AM Horia Geanta <horia.geanta@....com> wrote:
>
> On 1/27/2020 6:57 PM, Andrey Smirnov wrote:
> > Be consistent with the rest of the codebase and use GFP_DMA when
> > allocating memory for a CAAM JR descriptor.
> >
> Please use GFP_DMA32 instead.
> Device is not limited to less than 32 bits of addressing
> in any of its incarnations.
>
> s/GFP_DMA/GFP_DMA32 should be performed throughout caam driver.
> (But of course, I wouldn't include this change in current patch series).
>

Hmm, I am triggering
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/slub.c?h=v5.6-rc6#n1721
by using GFP_DMA32. AFAICT, GFP_DMA32 can't be used in SLUB/SLAB
allocated memory:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/internal.h?h=v5.6-rc6#n32

I'll stick with GFP_DMA for now, unless you have a different preference.

Thanks,
Andrey Smirnov