linux-kernel - Re: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

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Date:   Tue, 11 Feb 2020 18:39:37 -0600
From:   Li Yang <leoyang.li@....com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

On Tue, Feb 11, 2020 at 5:47 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> On Tue, Feb 11, 2020 at 05:36:55PM -0600, Li Yang wrote:
> > Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a module"),
> > there is a side effect that the module name is changed from arm-smmu to
> > arm-smmu-mod.  So the kernel parameter for disable_bypass need to be
> > changed too.  Fix the Kconfig help and error message to the correct
> > parameter name.
>
> Hmm, this seems to be a user-visible change - so those of us who have
> been booting with "arm-smmu.disable_bypass=0" now need to change that
> depending on which kernel is being booted - which is not nice, and
> makes the support side on platforms that need this kernel parameter
> harder.

I have sent a new patch replacing this patch.  That patch will keep
the command line unchanged.

>
> >
> > Signed-off-by: Li Yang <leoyang.li@....com>
> > ---
> >  drivers/iommu/Kconfig    | 2 +-
> >  drivers/iommu/arm-smmu.c | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > index d2fade984999..fb54be903c60 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -415,7 +415,7 @@ config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
> >         hardcode the bypass disable in the code.
> >
> >         NOTE: the kernel command line parameter
> > -       'arm-smmu.disable_bypass' will continue to override this
> > +       'arm-smmu-mod.disable_bypass' will continue to override this
> >         config.
> >
> >  config ARM_SMMU_V3
> > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> > index 16c4b87af42b..2ffe8ff04393 100644
> > --- a/drivers/iommu/arm-smmu.c
> > +++ b/drivers/iommu/arm-smmu.c
> > @@ -512,7 +512,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
> >               if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
> >                   (gfsr & ARM_SMMU_sGFSR_USF))
> >                       dev_err(smmu->dev,
> > -                             "Blocked unknown Stream ID 0x%hx; boot with \"arm-smmu.disable_bypass=0\" to allow, but this may have security implications\n",
> > +                             "Blocked unknown Stream ID 0x%hx; boot with \"arm-smmu-mod.disable_bypass=0\" to allow, but this may have security implications\n",
> >                               (u16)gfsynr1);
> >               else
> >                       dev_err(smmu->dev,
> > --
> > 2.17.1
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up

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