mm/gup: merge pXd huge mapping checks

Huge mapping checks in GUP are slightly redundant and can be simplified.

pXd_huge() now is the same as pXd_leaf(). pmd_trans_huge() and
pXd_devmap() should both imply pXd_leaf(). Time to merge them into one.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Peter Xu <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Cc: Alistair Popple <[e-mail]>
Cc: Andreas Larsson <[e-mail]>
Cc: "Aneesh Kumar K.V" <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Bjorn Andersson <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: David S. Miller <[e-mail]>
Cc: Fabio Estevam <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Konrad Dybcio <[e-mail]>
Cc: Krzysztof Kozlowski <[e-mail]>
Cc: Lucas Stach <[e-mail]>
Cc: Mark Salter <[e-mail]>
Cc: "Matthew Wilcox (Oracle)" <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Mike Rapoport (IBM) <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Cc: "Naveen N. Rao" <[e-mail]>
Cc: Nicholas Piggin <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Shawn Guo <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/gup.c

···
 		if (!pmd_present(pmd))
 			return 0;
 
-		if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd) ||
-			     pmd_devmap(pmd))) {
+		if (unlikely(pmd_leaf(pmd))) {
 			/* See gup_pte_range() */
 			if (pmd_protnone(pmd))
 				return 0;
···
 		next = pud_addr_end(addr, end);
 		if (unlikely(!pud_present(pud)))
 			return 0;
-		if (unlikely(pud_huge(pud) || pud_devmap(pud))) {
+		if (unlikely(pud_leaf(pud))) {
 			if (!gup_huge_pud(pud, pudp, addr, next, flags,
 					  pages, nr))
 				return 0;
···
 		next = pgd_addr_end(addr, end);
 		if (pgd_none(pgd))
 			return;
-		if (unlikely(pgd_huge(pgd))) {
+		if (unlikely(pgd_leaf(pgd))) {
 			if (!gup_huge_pgd(pgd, pgdp, addr, next, flags,
 					  pages, nr))
 				return;