arm64: Do not mask out PTE_RDONLY in pte_same()

Following commit 73e86cb ("arm64: Move PTE_RDONLY bit handling out
of set_pte_at()"), the PTE_RDONLY bit is no longer managed by
set_pte_at() but built into the PAGE_* attribute definitions.
Consequently, pte_same() must include this bit when checking two PTEs
for equality.

Remove the arm64-specific pte_same() function, practically reverting
commit 747a70e ("arm64: Fix copy-on-write referencing in HugeTLB")

Fixes: 73e86cb ("arm64: Move PTE_RDONLY bit handling out of set_pte_at()")
Cc: <[email protected]> # 4.14.x-
Cc: Will Deacon <[email protected]>
Cc: Steve Capper <[email protected]>
Reported-by: John Stultz <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

Author: ctmarinas

arch/arm64/include/asm/pgtable.h

@@ -283,23 +283,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 	set_pte(ptep, pte);
 }
 
-#define __HAVE_ARCH_PTE_SAME
-static inline int pte_same(pte_t pte_a, pte_t pte_b)
-{
-	pteval_t lhs, rhs;
-
-	lhs = pte_val(pte_a);
-	rhs = pte_val(pte_b);
-
-	if (pte_present(pte_a))
-		lhs &= ~PTE_RDONLY;
-
-	if (pte_present(pte_b))
-		rhs &= ~PTE_RDONLY;
-
-	return (lhs == rhs);
-}
-
 /*
  * Huge pte definitions.
  */