iommu: Fix passthrough option documentation

Document that the default for "iommu.passthrough" is now configurable.

Fixes: 1ae64be440b1 ("iommu: Add config option to set passthrough as default")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9871e649ffeffe8798cd20a1450377a4f4777fca..8c5a956f3d9c259ddead3d5414548500d6d53624 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1754,7 +1754,7 @@
                        Format: { "0" | "1" }
                        0 - Use IOMMU translation for DMA.
                        1 - Bypass the IOMMU for DMA.
-                       unset - Use IOMMU translation for DMA.
+                       unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
 
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in