On 2/15/2023 11:44 PM, Matthew Wilcox wrote:
On Wed, Feb 15, 2023 at 06:39:37PM +0800, Baolin Wang wrote:
Now the isolate_movable_page() can only return 0 or -EBUSY, and no users
will care about the negative return value, thus we can convert the
isolate_movable_page() to return a boolean value to make the code more
clear when checking the movable page isolation state.
No functional changes intended.
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
A couple of nits below, not worth respinning the patch series for:
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index c88b96b48be7..6b252f519c86 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -71,7 +71,7 @@ extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
unsigned long private, enum migrate_mode mode, int reason,
unsigned int *ret_succeeded);
extern struct page *alloc_migration_target(struct page *page, unsigned long private);
-extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
+extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
You can drop the 'extern' here.
+++ b/mm/memory_hotplug.c
@@ -1668,18 +1668,18 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* We can skip free pages. And we can deal with pages on
* LRU and non-lru movable pages.
*/
- if (PageLRU(page)) {
+ if (PageLRU(page))
isolated = isolate_lru_page(page);
- ret = isolated ? 0 : -EBUSY;
- } else
- ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE);
- if (!ret) { /* Success */
+ else
+ isolated = isolate_movable_page(page, ISOLATE_UNEVICTABLE);
+ if (isolated) { /* Success */
I would have dropped the "/* Success */" here. Before, commenting
"!ret" is quite sensible, but "isolated" seems obviously success to me.
Right. Hope Andrew can help to drop this unnecessary comment:)
Thanks for reviewing.
