linux-kernel - Re: [PATCH] x86: enable swiotlb for

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Message-ID: <20181014081443.GA17889@lst.de>
Date:   Sun, 14 Oct 2018 10:14:43 +0200
From:   Christoph Hellwig <hch@....de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Christoph Hellwig <hch@....de>, x86@...nel.org,
        tedheadster@...il.com, konrad.wilk@...cle.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels

On Sun, Oct 14, 2018 at 10:13:31AM +0200, Thomas Gleixner wrote:
> On Sun, 14 Oct 2018, Christoph Hellwig wrote:
> 
> > We already build the swiotlb code for 32b-t kernels with PAE support,
> > but the code to actually use swiotlb has only been enabled for 64-bit
> > kernel for an unknown reason.
> > 
> > Before Linux 4.18 we papers over this fact because the networking code,
> > the scsi layer and some random block drivers implenented their own
> > bounce buffering scheme.
> > 
> > Fixes: 21e07dba ("scsi: reduce use of block bounce buffers")
> > Fixes: ab74cfeb ("net: remove the PCI_DMA_BUS_IS_PHYS check in illegal_highdma")
> > Reported-by: tedheadster <tedheadster@...il.com>
> > Tested-by: tedheadster <tedheadster@...il.com>
> 
> I'll add your SOB when picking this up :)

Thanks.  Here it is in writing:

Signed-off-by: Christoph Hellwig <hch@....de>