linux-kernel - Re: [PATCH v2 3/3] swiotlb: Add swiotlb=noforce debug option

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Message-ID: <20161219133817.GA4358@localhost.localdomain>
Date:   Mon, 19 Dec 2016 08:38:19 -0500
From:   Konrad Rzeszutek Wilk <konrad@...nok.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v2 3/3] swiotlb: Add swiotlb=noforce debug option

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@...der.be>

What is this based on? I can't apply it on my latest that I had
sent to Linus?

Could you rebase this one please on:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git stable/for-linus-4.9

Thanks?

Or if alternatively that does not - then please rebase it on
b5cab0da75c292ffa0fbd68dd2c820066b2842de

Thanks!