mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE

__HAVE_ARCH_PTE_SWP_EXCLUSIVE is now supported by all architectures that
support swp PTEs, so let's drop it.

Link: https://lkml.kernel.org/r/20230113171026.582290-27-david@redhat.comSigned-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/alpha/include/asm/pgtable.h

@@ -328,7 +328,6 @@ extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/arc/include/asm/pgtable-bits-arcv2.h

@@ -132,7 +132,6 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/arm/include/asm/pgtable.h

@@ -298,7 +298,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(swp)	__pte((swp).val)
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_isset(pte, L_PTE_SWP_EXCLUSIVE);

arch/arm64/include/asm/pgtable.h

@@ -417,7 +417,6 @@ static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot)
 	return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT);
 }
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline pte_t pte_swp_mkexclusive(pte_t pte)
 {
 	return set_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE));

arch/csky/include/asm/pgtable.h

@@ -200,7 +200,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return pte;
 }
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/hexagon/include/asm/pgtable.h

@@ -397,7 +397,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 		(((type & 0x1f) << 1) | \
 		 ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/ia64/include/asm/pgtable.h

@@ -424,7 +424,6 @@ extern void paging_init (void);
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/loongarch/include/asm/pgtable.h

@@ -276,7 +276,6 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
 #define __swp_entry_to_pmd(x)	((pmd_t) { (x).val | _PAGE_HUGE })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/m68k/include/asm/mcf_pgtable.h

@@ -275,7 +275,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	(__pte((x).val))
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/m68k/include/asm/motorola_pgtable.h

@@ -190,7 +190,6 @@ extern pgd_t kernel_pg_dir[128];
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/m68k/include/asm/sun3_pgtable.h

@@ -174,7 +174,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/microblaze/include/asm/pgtable.h

@@ -412,7 +412,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) >> 2 })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val << 2 })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/mips/include/asm/pgtable.h

@@ -528,7 +528,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 }
 #endif
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 static inline int pte_swp_exclusive(pte_t pte)
 {

arch/nios2/include/asm/pgtable.h

@@ -253,7 +253,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 #define __swp_entry_to_pte(swp)	((pte_t) { (swp).val })
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/openrisc/include/asm/pgtable.h

@@ -408,7 +408,6 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/parisc/include/asm/pgtable.h

@@ -422,7 +422,6 @@ extern void paging_init (void);
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/powerpc/include/asm/book3s/32/pgtable.h

@@ -386,7 +386,6 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) >> 3 })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val << 3 })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/powerpc/include/asm/book3s/64/pgtable.h

@@ -717,7 +717,6 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
 }
 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline pte_t pte_swp_mkexclusive(pte_t pte)
 {
 	return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_EXCLUSIVE));

arch/powerpc/include/asm/nohash/pgtable.h

@@ -151,7 +151,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 }
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/riscv/include/asm/pgtable.h

@@ -752,7 +752,6 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/s390/include/asm/pgtable.h

@@ -812,7 +812,6 @@ static inline int pmd_protnone(pmd_t pmd)
 }
 #endif
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/sh/include/asm/pgtable_32.h

@@ -479,7 +479,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 /* In both cases, we borrow bit 6 to store the exclusive marker in swap PTEs. */
 #define _PAGE_SWP_EXCLUSIVE	_PAGE_USER
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte.pte_low & _PAGE_SWP_EXCLUSIVE;

arch/sparc/include/asm/pgtable_32.h

@@ -353,7 +353,6 @@ static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & SRMMU_SWP_EXCLUSIVE;

arch/sparc/include/asm/pgtable_64.h

@@ -989,7 +989,6 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

arch/um/include/asm/pgtable.h

@@ -313,7 +313,6 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
 	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE);

arch/x86/include/asm/pgtable.h

@@ -1299,7 +1299,6 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
 		unsigned long addr, pud_t *pud)
 {
 }
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline pte_t pte_swp_mkexclusive(pte_t pte)
 {
 	return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);

arch/xtensa/include/asm/pgtable.h

@@ -360,7 +360,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 static inline int pte_swp_exclusive(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;

include/linux/pgtable.h

@@ -1064,35 +1064,6 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 #define arch_start_context_switch(prev)	do {} while (0)
 #endif
 
-/*
- * When replacing an anonymous page by a real (!non) swap entry, we clear
- * PG_anon_exclusive from the page and instead remember whether the flag was
- * set in the swp pte. During fork(), we have to mark the entry as !exclusive
- * (possibly shared). On swapin, we use that information to restore
- * PG_anon_exclusive, which is very helpful in cases where we might have
- * additional (e.g., FOLL_GET) references on a page and wouldn't be able to
- * detect exclusivity.
- *
- * These functions don't apply to non-swap entries (e.g., migration, hwpoison,
- * ...).
- */
-#ifndef __HAVE_ARCH_PTE_SWP_EXCLUSIVE
-static inline pte_t pte_swp_mkexclusive(pte_t pte)
-{
-	return pte;
-}
-
-static inline int pte_swp_exclusive(pte_t pte)
-{
-	return false;
-}
-
-static inline pte_t pte_swp_clear_exclusive(pte_t pte)
-{
-	return pte;
-}
-#endif
-
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 #ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION
 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)

mm/debug_vm_pgtable.c

@@ -810,7 +810,6 @@ static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) {
 
 static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args)
 {
-#ifdef __HAVE_ARCH_PTE_SWP_EXCLUSIVE
 	unsigned long max_swap_offset;
 	swp_entry_t entry, entry2;
 	pte_t pte;
@@ -841,7 +840,6 @@ static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args)
 	WARN_ON(!is_swap_pte(pte));
 	entry2 = pte_to_swp_entry(pte);
 	WARN_ON(memcmp(&entry, &entry2, sizeof(entry)));
-#endif /* __HAVE_ARCH_PTE_SWP_EXCLUSIVE */
 }
 
 static void __init pte_swap_tests(struct pgtable_debug_args *args)

mm/memory.c

@@ -3864,10 +3864,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 	 * the swap entry concurrently) for certainly exclusive pages.
 	 */
 	if (!folio_test_ksm(folio)) {
-		/*
-		 * Note that pte_swp_exclusive() == false for architectures
-		 * without __HAVE_ARCH_PTE_SWP_EXCLUSIVE.
-		 */
 		exclusive = pte_swp_exclusive(vmf->orig_pte);
 		if (folio != swapcache) {
 			/*

mm/rmap.c

@@ -1710,17 +1710,6 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
 				page_vma_mapped_walk_done(&pvmw);
 				break;
 			}
-			/*
-			 * Note: We *don't* remember if the page was mapped
-			 * exclusively in the swap pte if the architecture
-			 * doesn't support __HAVE_ARCH_PTE_SWP_EXCLUSIVE. In
-			 * that case, swapin code has to re-determine that
-			 * manually and might detect the page as possibly
-			 * shared, for example, if there are other references on
-			 * the page or if the page is under writeback. We made
-			 * sure that there are no GUP pins on the page that
-			 * would rely on it, so for GUP pins this is fine.
-			 */
 			if (list_empty(&mm->mmlist)) {
 				spin_lock(&mmlist_lock);
 				if (list_empty(&mm->mmlist))