s390: supplement for ptdesc conversion

After commit 6326c26c ("s390: convert various pgalloc functions to use
ptdescs"), there are still some positions that use page->{lru, index}
instead of ptdesc->{pt_list, pt_index}.  In order to make the use of
ptdesc->{pt_list, pt_index} clearer, it would be better to convert them as
well.

[zhengqi.arch@bytedance.com: fix build failure]
  Link: https://lkml.kernel.org/r/20240305072154.26168-1-zhengqi.arch@bytedance.com
Link: https://lkml.kernel.org/r/04beaf3255056ffe131a5ea595736066c1e84756.1709541697.git.zhengqi.arch@bytedance.comSigned-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/s390/include/asm/pgalloc.h

@@ -23,9 +23,9 @@ unsigned long *crst_table_alloc(struct mm_struct *);
 void crst_table_free(struct mm_struct *, unsigned long *);
 
 unsigned long *page_table_alloc(struct mm_struct *);
-struct page *page_table_alloc_pgste(struct mm_struct *mm);
+struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm);
 void page_table_free(struct mm_struct *, unsigned long *);
-void page_table_free_pgste(struct page *page);
+void page_table_free_pgste(struct ptdesc *ptdesc);
 extern int page_table_allocate_pgste;
 
 static inline void crst_table_init(unsigned long *crst, unsigned long entry)

arch/s390/mm/gmap.c

@@ -206,9 +206,11 @@ static void gmap_free(struct gmap *gmap)
 
 	/* Free additional data for a shadow gmap */
 	if (gmap_is_shadow(gmap)) {
+		struct ptdesc *ptdesc, *n;
+
 		/* Free all page tables. */
-		list_for_each_entry_safe(page, next, &gmap->pt_list, lru)
-			page_table_free_pgste(page);
+		list_for_each_entry_safe(ptdesc, n, &gmap->pt_list, pt_list)
+			page_table_free_pgste(ptdesc);
 		gmap_rmap_radix_tree_free(&gmap->host_to_rmap);
 		/* Release reference to the parent */
 		gmap_put(gmap->parent);
@@ -1348,7 +1350,7 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 {
 	unsigned long *ste;
 	phys_addr_t sto, pgt;
-	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	ste = gmap_table_walk(sg, raddr, 1); /* get segment pointer */
@@ -1361,9 +1363,9 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 	*ste = _SEGMENT_ENTRY_EMPTY;
 	__gmap_unshadow_pgt(sg, raddr, __va(pgt));
 	/* Free page table */
-	page = phys_to_page(pgt);
-	list_del(&page->lru);
-	page_table_free_pgste(page);
+	ptdesc = page_ptdesc(phys_to_page(pgt));
+	list_del(&ptdesc->pt_list);
+	page_table_free_pgste(ptdesc);
 }
 
 /**
@@ -1377,7 +1379,7 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
 				unsigned long *sgt)
 {
-	struct page *page;
+	struct ptdesc *ptdesc;
 	phys_addr_t pgt;
 	int i;
 
@@ -1389,9 +1391,9 @@ static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
 		sgt[i] = _SEGMENT_ENTRY_EMPTY;
 		__gmap_unshadow_pgt(sg, raddr, __va(pgt));
 		/* Free page table */
-		page = phys_to_page(pgt);
-		list_del(&page->lru);
-		page_table_free_pgste(page);
+		ptdesc = page_ptdesc(phys_to_page(pgt));
+		list_del(&ptdesc->pt_list);
+		page_table_free_pgste(ptdesc);
 	}
 }
 
@@ -2058,19 +2060,19 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 {
 	unsigned long raddr, origin;
 	unsigned long *table;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	phys_addr_t s_pgt;
 	int rc;
 
 	BUG_ON(!gmap_is_shadow(sg) || (pgt & _SEGMENT_ENTRY_LARGE));
 	/* Allocate a shadow page table */
-	page = page_table_alloc_pgste(sg->mm);
-	if (!page)
+	ptdesc = page_table_alloc_pgste(sg->mm);
+	if (!ptdesc)
 		return -ENOMEM;
-	page->index = pgt & _SEGMENT_ENTRY_ORIGIN;
+	ptdesc->pt_index = pgt & _SEGMENT_ENTRY_ORIGIN;
 	if (fake)
-		page->index |= GMAP_SHADOW_FAKE_TABLE;
-	s_pgt = page_to_phys(page);
+		ptdesc->pt_index |= GMAP_SHADOW_FAKE_TABLE;
+	s_pgt = page_to_phys(ptdesc_page(ptdesc));
 	/* Install shadow page table */
 	spin_lock(&sg->guest_table_lock);
 	table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */
@@ -2088,7 +2090,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 	/* mark as invalid as long as the parent table is not protected */
 	*table = (unsigned long) s_pgt | _SEGMENT_ENTRY |
 		 (pgt & _SEGMENT_ENTRY_PROTECT) | _SEGMENT_ENTRY_INVALID;
-	list_add(&page->lru, &sg->pt_list);
+	list_add(&ptdesc->pt_list, &sg->pt_list);
 	if (fake) {
 		/* nothing to protect for fake tables */
 		*table &= ~_SEGMENT_ENTRY_INVALID;
@@ -2114,7 +2116,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 	return rc;
 out_free:
 	spin_unlock(&sg->guest_table_lock);
-	page_table_free_pgste(page);
+	page_table_free_pgste(ptdesc);
 	return rc;
 
 }

arch/s390/mm/pgalloc.c

@@ -135,7 +135,7 @@ int crst_table_upgrade(struct mm_struct *mm, unsigned long end)
 
 #ifdef CONFIG_PGSTE
 
-struct page *page_table_alloc_pgste(struct mm_struct *mm)
+struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm)
 {
 	struct ptdesc *ptdesc;
 	u64 *table;
@@ -147,12 +147,12 @@ struct page *page_table_alloc_pgste(struct mm_struct *mm)
 		memset64(table, _PAGE_INVALID, PTRS_PER_PTE);
 		memset64(table + PTRS_PER_PTE, 0, PTRS_PER_PTE);
 	}
-	return ptdesc_page(ptdesc);
+	return ptdesc;
 }
 
-void page_table_free_pgste(struct page *page)
+void page_table_free_pgste(struct ptdesc *ptdesc)
 {
-	pagetable_free(page_ptdesc(page));
+	pagetable_free(ptdesc);
 }
 
 #endif /* CONFIG_PGSTE */