Messages in this thread | | | Subject | Re: [PATCH v12 3/5] iommu/vt-d: Add support for IOMMU default DMA mode build options | From | John Garry <> | Date | Mon, 14 Jun 2021 09:03:43 +0100 |
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On 12/06/2021 03:14, Lu Baolu wrote: > On 2021/6/11 20:20, John Garry wrote: >> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig >> index 2a71347611d4..4467353f981b 100644 >> --- a/drivers/iommu/Kconfig >> +++ b/drivers/iommu/Kconfig >> @@ -94,6 +94,7 @@ choice >> prompt "IOMMU default DMA mode" >> depends on IOMMU_DMA >> + default IOMMU_DEFAULT_LAZY if INTEL_IOMMU >> default IOMMU_DEFAULT_STRICT > > If two default values are different. Which one will be overridden?
If I understand your question correctly, I think you are asking if both are set: CONFIG_IOMMU_DEFAULT_LAZY=y CONFIG_IOMMU_DEFAULT_STRICT=y
If this happens, then make defconfig complains about both being set, and selects the 2nd, whatever that is.
If neither are set, then IOMMU_DEFAULT_LAZY is set if INTEL_IOMMU is set, otherwise IOMMU_DEFAULT_STRICT.
Thanks, John
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