From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
tedheadster-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels
Date: Sun, 14 Oct 2018 10:14:43 +0200 [thread overview]
Message-ID: <20181014081443.GA17889@lst.de> (raw)
In-Reply-To: <alpine.DEB.2.21.1810141012510.1438-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > Tested-by: tedheadster <tedheadster-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>
> I'll add your SOB when picking this up :)
Thanks. Here it is in writing:
Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
next prev parent reply other threads:[~2018-10-14 8:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-14 7:52 [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels Christoph Hellwig
[not found] ` <20181014075208.2715-1-hch-jcswGhMUV9g@public.gmane.org>
2018-10-14 8:13 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1810141012510.1438-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-10-14 8:14 ` Christoph Hellwig [this message]
[not found] ` <20181014081443.GA17889-jcswGhMUV9g@public.gmane.org>
2018-10-14 8:57 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1810141055440.1438-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-10-14 9:04 ` Ingo Molnar
2018-10-14 12:49 ` tedheadster
2018-10-15 18:52 ` Konrad Rzeszutek Wilk
2018-10-16 13:11 ` tedheadster
[not found] ` <CAP8WD_Zj5aMcTCVtV-hot3zLNfNuMzHyeogm0Lqb=+XZ1LdkKw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-17 10:16 ` Thomas Gleixner
2018-10-17 16:33 ` Christoph Hellwig
[not found] ` <20181017163351.GA23719-jcswGhMUV9g@public.gmane.org>
2018-10-17 17:41 ` tedheadster
[not found] ` <CAP8WD_boL-DxEXxa-ci382Ff8yTdMS9T+sy2Y0-LEX-WPc8L_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-18 12:51 ` Christoph Hellwig
[not found] ` <20181018125116.GA24676-jcswGhMUV9g@public.gmane.org>
2018-10-19 1:00 ` tedheadster
[not found] ` <CAP8WD_Z2XvLsqimSnODwr5gj6GRuzh4SMKN56n6Y0JzufG=E8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-19 5:51 ` Ingo Molnar
2018-10-18 6:12 ` Ingo Molnar
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