linux-kernel - Re: dma_zalloc_coherent broken with 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7

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Message-ID: <CAMuHMdWidUxYNBVcDn7WxYb9V2bOnh_jwSuT2gYJ=-w1GnEoRg@mail.gmail.com>
Date:   Tue, 27 Mar 2018 10:51:45 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sebastian Ott <sebott@...ux.vnet.ibm.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: dma_zalloc_coherent broken with 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7

Hi Sebastian,

On Tue, Mar 27, 2018 at 10:41 AM, Sebastian Ott
<sebott@...ux.vnet.ibm.com> wrote:
> On Tue, 27 Mar 2018, Geert Uytterhoeven wrote:
>> On Tue, Mar 27, 2018 at 10:12 AM, Sebastian Ott
>> <sebott@...ux.vnet.ibm.com> wrote:
>> > commit 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7 broke usage of dma
>> > allocations specifying __GFP_ZERO by silently removing that flag.
>>
>> How did it break? The flag is now always added.
>
> +       flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO);
>
> I read that as a removal. But maybe I need more coffee..

Sorry, you're right.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds