The "swiotlb" kernel parameter is used on s390 for protected virt since
commit 64e1f0c531d1 ("s390/mm: force swiotlb for protected virtualization")
and thus should be marked in kernel-parameters.txt accordingly.
Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
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PS: I wonder whether we could remove IA-64 nowadays...?