linux-kernel - Re: [RFC] avoid indirect calls for DMA direct mappings v2

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Date:   Tue, 11 Dec 2018 18:15:04 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Busch, Keith" <keith.busch@...el.com>,
        "Derrick, Jonathan" <jonathan.derrick@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] avoid indirect calls for DMA direct mappings v2

On Tue, Dec 11, 2018 at 05:13:30PM +0000, Luck, Tony wrote:
> > But that might not be your fault. My ancient system is getting flaky. A v4.19 build that
> > has booted before is also resetting :-(
> 
> After a power-cycle (and some time to let the machine cool off). System now boots
> with your patch series plus the __phys_to_pfn() #define
> 
> So if you can figure the right way to fix that, you are good to go.
> 
> Tested-by: Tony Luck <tony.luck@...el.com>

Thanks.  I'll just replace the __phys_to_pfn with PHYS_PFN for now,
and see if I can find time to get the whole kernel to agree to
one version of this macro eventually..