mm: remove nr_entries parameter from pagevec_lookup_entries

All callers want to fetch the full size of the pvec.

Link: https://lkml.kernel.org/r/20201112212641.27837-13-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/pagevec.h

@@ -27,7 +27,7 @@ void __pagevec_release(struct pagevec *pvec);
 void __pagevec_lru_add(struct pagevec *pvec);
 unsigned pagevec_lookup_entries(struct pagevec *pvec,
 		struct address_space *mapping, pgoff_t start, pgoff_t end,
-		unsigned nr_entries, pgoff_t *indices);
+		pgoff_t *indices);
 void pagevec_remove_exceptionals(struct pagevec *pvec);
 unsigned pagevec_lookup_range(struct pagevec *pvec,
 			      struct address_space *mapping,

mm/swap.c

@@ -1044,9 +1044,9 @@ void __pagevec_lru_add(struct pagevec *pvec)
  */
 unsigned pagevec_lookup_entries(struct pagevec *pvec,
 		struct address_space *mapping, pgoff_t start, pgoff_t end,
-		unsigned nr_entries, pgoff_t *indices)
+		pgoff_t *indices)
 {
-	pvec->nr = find_get_entries(mapping, start, end, nr_entries,
+	pvec->nr = find_get_entries(mapping, start, end, PAGEVEC_SIZE,
 				    pvec->pages, indices);
 	return pagevec_count(pvec);
 }

mm/truncate.c

@@ -377,7 +377,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
 	for ( ; ; ) {
 		cond_resched();
 		if (!pagevec_lookup_entries(&pvec, mapping, index, end - 1,
-				PAGEVEC_SIZE, indices)) {
+				indices)) {
 			/* If all gone from start onwards, we're done */
 			if (index == start)
 				break;
@@ -638,8 +638,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 
 	pagevec_init(&pvec);
 	index = start;
-	while (pagevec_lookup_entries(&pvec, mapping, index, end,
-			PAGEVEC_SIZE, indices)) {
+	while (pagevec_lookup_entries(&pvec, mapping, index, end, indices)) {
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];