linux-kernel - Re: [PATCH v4 0/6] normalize IOMMU dma mode boot options

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Message-ID: <alpine.DEB.2.21.1904080829490.1840@nanos.tec.linutronix.de>
Date:   Mon, 8 Apr 2019 08:32:50 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
cc:     Hanjun Guo <guohanjun@...wei.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        John Garry <john.garry@...wei.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jonathan Corbet <corbet@....net>,
        linux-doc <linux-doc@...r.kernel.org>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org>
Subject: Re: [PATCH v4 0/6] normalize IOMMU dma mode boot options

On Mon, 8 Apr 2019, Leizhen (ThunderTown) wrote:
> > 
> > This will break systems using boot options as now, and I think
> > this is unacceptable. If you want to do so, just introduce iommu.dma_mode
> > on top of those iommu boot options with dma mode boot options unchanged,
> > and iommu.dma_mode is for all archs but compatible with them.
> 
> I just changed the boot options name, but keep the function no change. I added
> all related maintainers/supporters in the "to=" list, maybe we can disuss this.

Changing the name _IS_ the problem. Think about unattended updates.

> Should I add some "obsoleted" warnings for old options and keep them for a while?

No, just keep the old options around for backwards compatibilty sake. We
just do not add new arch specific options in the future. New options need
to use the generic iommu.dma_mode name space.

Thanks,

	tglx