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

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Message-ID: <20181014090433.GA28319@gmail.com>
Date:   Sun, 14 Oct 2018 11:04:33 +0200
From:   Ingo Molnar <mingo@...nel.org>
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


* Thomas Gleixner <tglx@...utronix.de> wrote:

> On Sun, 14 Oct 2018, Christoph Hellwig wrote:
> 
> > 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")
> 
> Please use the first 12 characters of the commit SHA for fixes tags in the
> future, as documented. No need to resend, I fixed it up for you and added a
> Cc: stable as well

For those who have their ~/.gitconfig's from ancient Git history, this can be done via:

	git config --global core.abbrev 12

Thanks,

	Ingo