mm/memory: page_remove_rmap() -> folio_remove_rmap_pte()

Let's convert zap_pte_range() and closely-related tlb_flush_rmap_batch(). 
While at it, perform some more folio conversion in zap_pte_range().

Link: https://lkml.kernel.org/r/20231220224504.646757-29-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 14 insertions, 11 deletions

diff --git a/mm/memory.c b/mm/memory.c
index e84917c118ac..e52c6e97444a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1434,6 +1434,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 	arch_enter_lazy_mmu_mode();
 	do {
 		pte_t ptent = ptep_get(pte);
+		struct folio *folio;
 		struct page *page;
 
 		if (pte_none(ptent))
@@ -1459,21 +1460,22 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 				continue;
 			}
 
+			folio = page_folio(page);
 			delay_rmap = 0;
-			if (!PageAnon(page)) {
+			if (!folio_test_anon(folio)) {
 				if (pte_dirty(ptent)) {
-					set_page_dirty(page);
+					folio_set_dirty(folio);
 					if (tlb_delay_rmap(tlb)) {
 						delay_rmap = 1;
 						force_flush = 1;
 					}
 				}
 				if (pte_young(ptent) && likely(vma_has_recency(vma)))
-					mark_page_accessed(page);
+					folio_mark_accessed(folio);
 			}
 			rss[mm_counter(page)]--;
 			if (!delay_rmap) {
-				page_remove_rmap(page, vma, false);
+				folio_remove_rmap_pte(folio, page, vma);
 				if (unlikely(page_mapcount(page) < 0))
 					print_bad_pte(vma, addr, ptent, page);
 			}
@@ -1489,6 +1491,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 		if (is_device_private_entry(entry) ||
 		    is_device_exclusive_entry(entry)) {
 			page = pfn_swap_entry_to_page(entry);
+			folio = page_folio(page);
 			if (unlikely(!should_zap_page(details, page)))
 				continue;
 			/*
@@ -1500,8 +1503,8 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 			WARN_ON_ONCE(!vma_is_anonymous(vma));
 			rss[mm_counter(page)]--;
 			if (is_device_private_entry(entry))
-				page_remove_rmap(page, vma, false);
-			put_page(page);
+				folio_remove_rmap_pte(folio, page, vma);
+			folio_put(folio);
 		} else if (!non_swap_entry(entry)) {
 			/* Genuine swap entry, hence a private anon page */
 			if (!should_zap_cows(details))
@@ -3220,10 +3223,10 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 			 * threads.
 			 *
 			 * The critical issue is to order this
-			 * page_remove_rmap with the ptp_clear_flush above.
-			 * Those stores are ordered by (if nothing else,)
+			 * folio_remove_rmap_pte() with the ptp_clear_flush
+			 * above. Those stores are ordered by (if nothing else,)
 			 * the barrier present in the atomic_add_negative
-			 * in page_remove_rmap.
+			 * in folio_remove_rmap_pte();
 			 *
 			 * Then the TLB flush in ptep_clear_flush ensures that
 			 * no process can access the old page before the
@@ -3232,7 +3235,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 			 * mapcount is visible. So transitively, TLBs to
 			 * old page will be flushed before it can be reused.
 			 */
-			page_remove_rmap(vmf->page, vma, false);
+			folio_remove_rmap_pte(old_folio, vmf->page, vma);
 		}
 
 		/* Free the old page.. */
diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
index 4f559f4ddd21..604ddf08affe 100644
--- a/mm/mmu_gather.c
+++ b/mm/mmu_gather.c
@@ -55,7 +55,7 @@ static void tlb_flush_rmap_batch(struct mmu_gather_batch *batch, struct vm_area_
 
 		if (encoded_page_flags(enc)) {
 			struct page *page = encoded_page_ptr(enc);
-			page_remove_rmap(page, vma, false);
+			folio_remove_rmap_pte(page_folio(page), page, vma);
 		}
 	}
 }