mm/gup: detect huge pfnmap entries in gup-fast

jira LE-3557
Rebuild_History Non-Buildable kernel-5.14.0-570.26.1.el9_6
commit-author Peter Xu <[email protected]>
commit ae3c99e

Since gup-fast doesn't have the vma reference, teach it to detect such huge
pfnmaps by checking the special bit for pmd/pud too, just like ptes.

Link: https://lkml.kernel.org/r/[email protected]
	Signed-off-by: Peter Xu <[email protected]>
	Acked-by: David Hildenbrand <[email protected]>
	Reviewed-by: Jason Gunthorpe <[email protected]>
	Cc: Alexander Gordeev <[email protected]>
	Cc: Alex Williamson <[email protected]>
	Cc: Aneesh Kumar K.V <[email protected]>
	Cc: Borislav Petkov <[email protected]>
	Cc: Catalin Marinas <[email protected]>
	Cc: Christian Borntraeger <[email protected]>
	Cc: Dave Hansen <[email protected]>
	Cc: Gavin Shan <[email protected]>
	Cc: Gerald Schaefer <[email protected]>
	Cc: Heiko Carstens <[email protected]>
	Cc: Ingo Molnar <[email protected]>
	Cc: Matthew Wilcox <[email protected]>
	Cc: Niklas Schnelle <[email protected]>
	Cc: Paolo Bonzini <[email protected]>
	Cc: Ryan Roberts <[email protected]>
	Cc: Sean Christopherson <[email protected]>
	Cc: Sven Schnelle <[email protected]>
	Cc: Thomas Gleixner <[email protected]>
	Cc: Vasily Gorbik <[email protected]>
	Cc: Will Deacon <[email protected]>
	Cc: Zi Yan <[email protected]>
	Signed-off-by: Andrew Morton <[email protected]>
(cherry picked from commit ae3c99e)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

mm/gup.c

@@ -2903,6 +2903,9 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
 	if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
 		return 0;
 
+	if (pmd_special(orig))
+		return 0;
+
 	if (pmd_devmap(orig)) {
 		if (unlikely(flags & FOLL_LONGTERM))
 			return 0;
@@ -2947,6 +2950,9 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
 	if (!pud_access_permitted(orig, flags & FOLL_WRITE))
 		return 0;
 
+	if (pud_special(orig))
+		return 0;
+
 	if (pud_devmap(orig)) {
 		if (unlikely(flags & FOLL_LONGTERM))
 			return 0;