UBUNTU: SAUCE: Add pfn_pud() and pud_mkhuge()
Both were introduced when pud size transparent hugepage support was
added and that would be too complex and dangerous to backport. The
pfn_pud() function was extended in "x86/speculation/l1tf: Protect
PROT_NONE PTEs against speculation" but not backported then since it
was not present, yet (so no users).
For the following patch, though, we will need both.
CVE-2018-3620
CVE-2018-3646
Signed-off-by:
Stefan Bader <stefan.bader@canonical.com>
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