um: Rename _PAGE_NEWPAGE to _PAGE_NEEDSYNC

The _PAGE_NEWPAGE bit does not really indicate that this is a new page,
but rather whether this entry needs to be synced or not. Renaming it
to _PAGE_NEEDSYNC will make it more clear how everything ties together.

Suggested-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20241011102354.1682626-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: btw616

arch/um/include/asm/page.h

@@ -56,7 +56,7 @@ typedef struct { unsigned long pud; } pud_t;
 #define pte_set_bits(p, bits) ((p).pte |= (bits))
 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
 #define pte_copy(to, from) ((to).pte = (from).pte)
-#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
+#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEEDSYNC))
 #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
 
 typedef unsigned long phys_t;

arch/um/include/asm/pgtable-2level.h

@@ -31,7 +31,7 @@
         printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
 	       pgd_val(e))
 
-static inline int pgd_newpage(pgd_t pgd)	{ return 0; }
+static inline int pgd_needsync(pgd_t pgd)	{ return 0; }
 static inline void pgd_mkuptodate(pgd_t pgd)	{ }
 
 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))

arch/um/include/asm/pgtable-4level.h

@@ -55,15 +55,15 @@
         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 	       pgd_val(e))
 
-#define pud_none(x)	(!(pud_val(x) & ~_PAGE_NEWPAGE))
+#define pud_none(x)	(!(pud_val(x) & ~_PAGE_NEEDSYNC))
 #define	pud_bad(x)	((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 #define pud_present(x)	(pud_val(x) & _PAGE_PRESENT)
 #define pud_populate(mm, pud, pmd) \
 	set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
 
 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
 
-#define p4d_none(x)	(!(p4d_val(x) & ~_PAGE_NEWPAGE))
+#define p4d_none(x)	(!(p4d_val(x) & ~_PAGE_NEEDSYNC))
 #define	p4d_bad(x)	((p4d_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 #define p4d_present(x)	(p4d_val(x) & _PAGE_PRESENT)
 #define p4d_populate(mm, p4d, pud) \
@@ -72,23 +72,23 @@
 #define set_p4d(p4dptr, p4dval) (*(p4dptr) = (p4dval))
 
 
-static inline int pgd_newpage(pgd_t pgd)
+static inline int pgd_needsync(pgd_t pgd)
 {
-	return(pgd_val(pgd) & _PAGE_NEWPAGE);
+	return pgd_val(pgd) & _PAGE_NEEDSYNC;
 }
 
-static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
+static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEEDSYNC; }
 
 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
 
 static inline void pud_clear (pud_t *pud)
 {
-	set_pud(pud, __pud(_PAGE_NEWPAGE));
+	set_pud(pud, __pud(_PAGE_NEEDSYNC));
 }
 
 static inline void p4d_clear (p4d_t *p4d)
 {
-	set_p4d(p4d, __p4d(_PAGE_NEWPAGE));
+	set_p4d(p4d, __p4d(_PAGE_NEEDSYNC));
 }
 
 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)

arch/um/include/asm/pgtable.h

@@ -11,7 +11,7 @@
 #include <asm/fixmap.h>
 
 #define _PAGE_PRESENT	0x001
-#define _PAGE_NEWPAGE	0x002
+#define _PAGE_NEEDSYNC	0x002
 #define _PAGE_RW	0x020
 #define _PAGE_USER	0x040
 #define _PAGE_ACCESSED	0x080
@@ -79,22 +79,22 @@ extern unsigned long end_iomem;
  */
 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
 
-#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+#define pte_clear(mm, addr, xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEEDSYNC))
 
-#define pmd_none(x)	(!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
+#define pmd_none(x)	(!((unsigned long)pmd_val(x) & ~_PAGE_NEEDSYNC))
 #define	pmd_bad(x)	((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 
 #define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
-#define pmd_clear(xp)	do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+#define pmd_clear(xp)	do { pmd_val(*(xp)) = _PAGE_NEEDSYNC; } while (0)
 
-#define pmd_newpage(x)  (pmd_val(x) & _PAGE_NEWPAGE)
-#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+#define pmd_needsync(x)   (pmd_val(x) & _PAGE_NEEDSYNC)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEEDSYNC)
 
-#define pud_newpage(x)  (pud_val(x) & _PAGE_NEWPAGE)
-#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+#define pud_needsync(x)   (pud_val(x) & _PAGE_NEEDSYNC)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEEDSYNC)
 
-#define p4d_newpage(x)  (p4d_val(x) & _PAGE_NEWPAGE)
-#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEWPAGE)
+#define p4d_needsync(x)   (p4d_val(x) & _PAGE_NEEDSYNC)
+#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEEDSYNC)
 
 #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
 #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
@@ -145,9 +145,9 @@ static inline int pte_young(pte_t pte)
 	return pte_get_bits(pte, _PAGE_ACCESSED);
 }
 
-static inline int pte_newpage(pte_t pte)
+static inline int pte_needsync(pte_t pte)
 {
-	return pte_get_bits(pte, _PAGE_NEWPAGE);
+	return pte_get_bits(pte, _PAGE_NEEDSYNC);
 }
 
 /*
@@ -200,25 +200,25 @@ static inline pte_t pte_mkwrite_novma(pte_t pte)
 
 static inline pte_t pte_mkuptodate(pte_t pte)
 {
-	pte_clear_bits(pte, _PAGE_NEWPAGE);
+	pte_clear_bits(pte, _PAGE_NEEDSYNC);
 	return pte;
 }
 
-static inline pte_t pte_mknewpage(pte_t pte)
+static inline pte_t pte_mkneedsync(pte_t pte)
 {
-	pte_set_bits(pte, _PAGE_NEWPAGE);
+	pte_set_bits(pte, _PAGE_NEEDSYNC);
 	return(pte);
 }
 
 static inline void set_pte(pte_t *pteptr, pte_t pteval)
 {
 	pte_copy(*pteptr, pteval);
 
-	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
+	/* If it's a swap entry, it needs to be marked _PAGE_NEEDSYNC so
 	 * update_pte_range knows to unmap it.
 	 */
 
-	*pteptr = pte_mknewpage(*pteptr);
+	*pteptr = pte_mkneedsync(*pteptr);
 }
 
 #define PFN_PTE_SHIFT		PAGE_SHIFT
@@ -258,7 +258,7 @@ static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
 #define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t pte_a, pte_t pte_b)
 {
-	return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
+	return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEEDSYNC);
 }
 
 /*
@@ -308,7 +308,7 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
  *   <--------------- offset ----------------> E < type -> 0 0 0 1 0
  *
  *   E is the exclusive marker that is not stored in swap entries.
- *   _PAGE_NEWPAGE (bit 1) is always set to 1 in set_pte().
+ *   _PAGE_NEEDSYNC (bit 1) is always set to 1 in set_pte().
  */
 #define __swp_type(x)			(((x).val >> 5) & 0x1f)
 #define __swp_offset(x)			((x).val >> 11)

arch/um/kernel/tlb.c

@@ -57,7 +57,7 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
 
 	pte = pte_offset_kernel(pmd, addr);
 	do {
-		if (!pte_newpage(*pte))
+		if (!pte_needsync(*pte))
 			continue;
 
 		if (pte_present(*pte)) {
@@ -101,7 +101,7 @@ static inline int update_pmd_range(pud_t *pud, unsigned long addr,
 	do {
 		next = pmd_addr_end(addr, end);
 		if (!pmd_present(*pmd)) {
-			if (pmd_newpage(*pmd)) {
+			if (pmd_needsync(*pmd)) {
 				ret = ops->unmap(ops->mm_idp, addr,
 						 next - addr);
 				pmd_mkuptodate(*pmd);
@@ -124,7 +124,7 @@ static inline int update_pud_range(p4d_t *p4d, unsigned long addr,
 	do {
 		next = pud_addr_end(addr, end);
 		if (!pud_present(*pud)) {
-			if (pud_newpage(*pud)) {
+			if (pud_needsync(*pud)) {
 				ret = ops->unmap(ops->mm_idp, addr,
 						 next - addr);
 				pud_mkuptodate(*pud);
@@ -147,7 +147,7 @@ static inline int update_p4d_range(pgd_t *pgd, unsigned long addr,
 	do {
 		next = p4d_addr_end(addr, end);
 		if (!p4d_present(*p4d)) {
-			if (p4d_newpage(*p4d)) {
+			if (p4d_needsync(*p4d)) {
 				ret = ops->unmap(ops->mm_idp, addr,
 						 next - addr);
 				p4d_mkuptodate(*p4d);
@@ -181,7 +181,7 @@ int um_tlb_sync(struct mm_struct *mm)
 	do {
 		next = pgd_addr_end(addr, mm->context.sync_tlb_range_to);
 		if (!pgd_present(*pgd)) {
-			if (pgd_newpage(*pgd)) {
+			if (pgd_needsync(*pgd)) {
 				ret = ops.unmap(ops.mm_idp, addr,
 						next - addr);
 				pgd_mkuptodate(*pgd);