mm/kasan: use pXd_leaf() in shadow_mapped()

There is an old trick in shadow_mapped() to use pXd_bad() to detect huge
pages. After commit 93fab1b22ef7 ("mm: add generic p?d_leaf() macros") we
have a global API for huge mappings. Use that to replace the trick.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Peter Xu <[e-mail]>
Reviewed-by: Mike Rapoport (IBM) <[e-mail]>
Cc: Andrey Ryabinin <[e-mail]>
Cc: Alexander Potapenko <[e-mail]>
Cc: Andrey Konovalov <[e-mail]>
Cc: Dmitry Vyukov <[e-mail]>
Cc: Vincenzo Frascino <[e-mail]>
Cc: "Aneesh Kumar K.V" <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jason Gunthorpe <[e-mail]>
Cc: Kirill A. Shutemov <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: "Naveen N. Rao" <[e-mail]>
Cc: Nicholas Piggin <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Yang Shi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/kasan/shadow.c

···
 	pud = pud_offset(p4d, addr);
 	if (pud_none(*pud))
 		return false;
-
-	/*
-	 * We can't use pud_large() or pud_huge(), the first one is
-	 * arch-specific, the last one depends on HUGETLB_PAGE.  So let's abuse
-	 * pud_bad(), if pud is bad then it's bad because it's huge.
-	 */
-	if (pud_bad(*pud))
+	if (pud_leaf(*pud))
 		return true;
 	pmd = pmd_offset(pud, addr);
 	if (pmd_none(*pmd))
 		return false;
-
-	if (pmd_bad(*pmd))
+	if (pmd_leaf(*pmd))
 		return true;
 	pte = pte_offset_kernel(pmd, addr);
 	return !pte_none(ptep_get(pte));