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SubjectRe: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter
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.

>
> Signed-off-by: Li Yang <leoyang.li@nxp.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@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

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