From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Konrad Rzeszutek Wilk <konrad@darnok.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Jonathan Corbet <corbet@lwn.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
David Vrabel <david.vrabel@citrix.com>,
Juergen Gross <jgross@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH v2 3/3] swiotlb: Add swiotlb=noforce debug option
Date: Mon, 19 Dec 2016 14:57:00 +0100 [thread overview]
Message-ID: <CAMuHMdUdXiYOFxcWn-DbTTi8E7DUAGTbcnpBV2e17PQt7PzFhg@mail.gmail.com> (raw)
In-Reply-To: <20161219133817.GA4358@localhost.localdomain>
Hi Konrad,
On Mon, Dec 19, 2016 at 2:38 PM, Konrad Rzeszutek Wilk
<konrad@darnok.org> wrote:
> On Fri, Dec 16, 2016 at 02:28:42PM +0100, Geert Uytterhoeven wrote:
>> On architectures like arm64, swiotlb is tied intimately to the core
>> architecture DMA support. In addition, ZONE_DMA cannot be disabled.
>>
>> To aid debugging and catch devices not supporting DMA to memory outside
>> the 32-bit address space, add a kernel command line option
>> "swiotlb=noforce", which disables the use of bounce buffers.
>> If specified, trying to map memory that cannot be used with DMA will
>> fail, and a rate-limited warning will be printed.
>>
>> Note that io_tlb_nslabs is set to 1, which is the minimal supported
>> value.
>>
>> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
>
> What is this based on? I can't apply it on my latest that I had
> sent to Linus?
I rebased it on last Friday's linux-next, due to the recent move of
kernel-parameters.txt.
All the rest should be identical to your linux-next branch.
> Could you rebase this one please on:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git stable/for-linus-4.9
That one indeed doesn't have the move of kernel-parameters.txt.
> Or if alternatively that does not - then please rebase it on
> b5cab0da75c292ffa0fbd68dd2c820066b2842de
However, my series already applies cleanly with git am on top of
that commit?
Please let me know what to do. Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2016-12-19 13:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-16 13:28 [PATCH v2 0/3] swiotlb: Add swiotlb=noforce debug option Geert Uytterhoeven
2016-12-16 13:28 ` [PATCH v2 1/3] x86, swiotlb: Simplify pci_swiotlb_detect_override() Geert Uytterhoeven
2016-12-16 13:28 ` [PATCH v2 2/3] swiotlb: Convert swiotlb_force from int to enum Geert Uytterhoeven
2017-01-04 17:57 ` Catalin Marinas
2017-01-04 18:25 ` Konrad Rzeszutek Wilk
2016-12-16 13:28 ` [PATCH v2 3/3] swiotlb: Add swiotlb=noforce debug option Geert Uytterhoeven
2016-12-19 13:38 ` Konrad Rzeszutek Wilk
2016-12-19 13:57 ` Geert Uytterhoeven [this message]
2016-12-19 14:31 ` Konrad Rzeszutek Wilk
2017-01-04 18:00 ` Catalin Marinas
2016-12-19 13:31 ` [PATCH v2 0/3] " Konrad Rzeszutek Wilk
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