mm: remove "prot" parameter from move_pte()

JIRA: https://issues.redhat.com/browse/RHEL-84184
JIRA: https://issues.redhat.com/browse/RHEL-80529

This patch is a backport of the following upstream commit:
commit 82a616d
Author: David Hildenbrand <[email protected]>
Date:   Wed Mar 27 15:33:01 2024 +0100

    mm: remove "prot" parameter from move_pte()

    The "prot" parameter is unused, and using it instead of what's stored in
    that particular PTE would very likely be wrong.  Let's simply remove it.

    Link: https://lkml.kernel.org/r/[email protected]
    Signed-off-by: David Hildenbrand <[email protected]>
    Reviewed-by: Vishal Moola (Oracle) <[email protected]>
    Cc: "David S. Miller" <[email protected]>
    Cc: Andreas Larsson <[email protected]>
    Signed-off-by: Andrew Morton <[email protected]>

Signed-off-by: Rafael Aquini <[email protected]>

Author: Rafael Aquini

arch/sparc/include/asm/pgtable_64.h

@@ -941,7 +941,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 
 #ifdef DCACHE_ALIASING_POSSIBLE
 #define __HAVE_ARCH_MOVE_PTE
-#define move_pte(pte, prot, old_addr, new_addr)				\
+#define move_pte(pte, old_addr, new_addr)				\
 ({									\
 	pte_t newpte = (pte);						\
 	if (tlb_type != hypervisor && pte_present(pte)) {		\

include/linux/pgtable.h

@@ -929,7 +929,7 @@ static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
 #endif
 
 #ifndef __HAVE_ARCH_MOVE_PTE
-#define move_pte(pte, prot, old_addr, new_addr)	(pte)
+#define move_pte(pte, old_addr, new_addr)	(pte)
 #endif
 
 #ifndef pte_accessible

mm/mremap.c

@@ -205,7 +205,7 @@ static int move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
 		 */
 		if (pte_present(pte))
 			force_flush = true;
-		pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr);
+		pte = move_pte(pte, old_addr, new_addr);
 		pte = move_soft_dirty_pte(pte);
 		set_pte_at(mm, new_addr, new_pte, pte);
 	}