mm/rmap: rename COMPOUND_MAPPED to ENTIRELY_MAPPED

We removed all "bool compound" and RMAP_COMPOUND parameters.  Let's remove
the remaining "compound" terminology by making COMPOUND_MAPPED match the
"folio->_entire_mapcount" terminology, renaming it to ENTIRELY_MAPPED.

ENTIRELY_MAPPED is only used when the whole folio is mapped using a single
page table entry (e.g., a single PMD mapping a PMD-sized THP).  For now,
we don't support mapping any THP bigger than that, so ENTIRELY_MAPPED only
applies to PMD-mapped PMD-sized THP only.

Link: https://lkml.kernel.org/r/20231220224504.646757-40-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>

3 files changed, 13 insertions, 13 deletions

diff --git a/Documentation/mm/transhuge.rst b/Documentation/mm/transhuge.rst
index cf81272a6b8b..93c9239b9ebe 100644
--- a/Documentation/mm/transhuge.rst
+++ b/Documentation/mm/transhuge.rst
@@ -117,7 +117,7 @@ pages:
 
   - map/unmap of a PMD entry for the whole THP increment/decrement
     folio->_entire_mapcount and also increment/decrement
-    folio->_nr_pages_mapped by COMPOUND_MAPPED when _entire_mapcount
+    folio->_nr_pages_mapped by ENTIRELY_MAPPED when _entire_mapcount
     goes from -1 to 0 or 0 to -1.
 
   - map/unmap of individual pages with PTE entry increment/decrement
diff --git a/mm/internal.h b/mm/internal.h
index 29589bc3f046..188807d2aebc 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -54,12 +54,12 @@ void page_writeback_init(void);
 
 /*
  * If a 16GB hugetlb folio were mapped by PTEs of all of its 4kB pages,
- * its nr_pages_mapped would be 0x400000: choose the COMPOUND_MAPPED bit
+ * its nr_pages_mapped would be 0x400000: choose the ENTIRELY_MAPPED bit
  * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE).  Hugetlb currently
  * leaves nr_pages_mapped at 0, but avoid surprise if it participates later.
  */
-#define COMPOUND_MAPPED		0x800000
-#define FOLIO_PAGES_MAPPED	(COMPOUND_MAPPED - 1)
+#define ENTIRELY_MAPPED		0x800000
+#define FOLIO_PAGES_MAPPED	(ENTIRELY_MAPPED - 1)
 
 /*
  * Flags passed to __show_mem() and show_free_areas() to suppress output in
diff --git a/mm/rmap.c b/mm/rmap.c
index 6209e65985a2..f5d43edad529 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1172,7 +1172,7 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio,
 			first = atomic_inc_and_test(&page->_mapcount);
 			if (first && folio_test_large(folio)) {
 				first = atomic_inc_return_relaxed(mapped);
-				first = (first < COMPOUND_MAPPED);
+				first = (first < ENTIRELY_MAPPED);
 			}
 
 			if (first)
@@ -1182,15 +1182,15 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio,
 	case RMAP_LEVEL_PMD:
 		first = atomic_inc_and_test(&folio->_entire_mapcount);
 		if (first) {
-			nr = atomic_add_return_relaxed(COMPOUND_MAPPED, mapped);
-			if (likely(nr < COMPOUND_MAPPED + COMPOUND_MAPPED)) {
+			nr = atomic_add_return_relaxed(ENTIRELY_MAPPED, mapped);
+			if (likely(nr < ENTIRELY_MAPPED + ENTIRELY_MAPPED)) {
 				*nr_pmdmapped = folio_nr_pages(folio);
 				nr = *nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED);
 				/* Raced ahead of a remove and another add? */
 				if (unlikely(nr < 0))
 					nr = 0;
 			} else {
-				/* Raced ahead of a remove of COMPOUND_MAPPED */
+				/* Raced ahead of a remove of ENTIRELY_MAPPED */
 				nr = 0;
 			}
 		}
@@ -1433,7 +1433,7 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
 	} else {
 		/* increment count (starts at -1) */
 		atomic_set(&folio->_entire_mapcount, 0);
-		atomic_set(&folio->_nr_pages_mapped, COMPOUND_MAPPED);
+		atomic_set(&folio->_nr_pages_mapped, ENTIRELY_MAPPED);
 		SetPageAnonExclusive(&folio->page);
 		__lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr);
 	}
@@ -1514,7 +1514,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
 			last = atomic_add_negative(-1, &page->_mapcount);
 			if (last && folio_test_large(folio)) {
 				last = atomic_dec_return_relaxed(mapped);
-				last = (last < COMPOUND_MAPPED);
+				last = (last < ENTIRELY_MAPPED);
 			}
 
 			if (last)
@@ -1524,15 +1524,15 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
 	case RMAP_LEVEL_PMD:
 		last = atomic_add_negative(-1, &folio->_entire_mapcount);
 		if (last) {
-			nr = atomic_sub_return_relaxed(COMPOUND_MAPPED, mapped);
-			if (likely(nr < COMPOUND_MAPPED)) {
+			nr = atomic_sub_return_relaxed(ENTIRELY_MAPPED, mapped);
+			if (likely(nr < ENTIRELY_MAPPED)) {
 				nr_pmdmapped = folio_nr_pages(folio);
 				nr = nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED);
 				/* Raced ahead of another remove and an add? */
 				if (unlikely(nr < 0))
 					nr = 0;
 			} else {
-				/* An add of COMPOUND_MAPPED raced ahead */
+				/* An add of ENTIRELY_MAPPED raced ahead */
 				nr = 0;
 			}
 		}