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

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Date:   Tue, 11 Dec 2018 17:13:30 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Christoph Hellwig <hch@....de>
CC:     "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

> 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>