linux-kernel - Re: dma_zalloc_coherent broken with 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7

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Date:   Tue, 27 Mar 2018 10:41:45 +0200 (CEST)
From:   Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

Hello Geert,

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..

Sebastian