From 80562ba0d8378e89fe5836c28ea56c2aab3014e8 Mon Sep 17 00:00:00 2001 From: Huang Ying Date: Mon, 13 Feb 2023 20:34:41 +0800 Subject: [PATCH] migrate_pages: move migrate_folio_unmap() Just move the position of the functions. There's no any functionality change. This is to make it easier to review the next patch via putting code near its position in the next patch. Link: https://lkml.kernel.org/r/20230213123444.155149-7-ying.huang@intel.com Signed-off-by: "Huang, Ying" Reviewed-by: Zi Yan Cc: Yang Shi Cc: Baolin Wang Cc: Oscar Salvador Cc: Matthew Wilcox Cc: Bharata B Rao Cc: Alistair Popple Cc: Xin Hao Cc: Minchan Kim Cc: Mike Kravetz Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Andrew Morton --- mm/migrate.c | 100 +++++++++++++++++++++++++-------------------------- 1 file changed, 50 insertions(+), 50 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index ee3e21f1061c..0c7488ebe248 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1236,6 +1236,56 @@ out: return rc; } +/* Obtain the lock on page, remove all ptes. */ +static int migrate_folio_unmap(new_page_t get_new_page, free_page_t put_new_page, + unsigned long private, struct folio *src, + struct folio **dstp, int force, bool avoid_force_lock, + enum migrate_mode mode, enum migrate_reason reason, + struct list_head *ret) +{ + struct folio *dst; + int rc = MIGRATEPAGE_UNMAP; + struct page *newpage = NULL; + + if (!thp_migration_supported() && folio_test_transhuge(src)) + return -ENOSYS; + + if (folio_ref_count(src) == 1) { + /* Folio was freed from under us. So we are done. */ + folio_clear_active(src); + folio_clear_unevictable(src); + /* free_pages_prepare() will clear PG_isolated. */ + list_del(&src->lru); + migrate_folio_done(src, reason); + return MIGRATEPAGE_SUCCESS; + } + + newpage = get_new_page(&src->page, private); + if (!newpage) + return -ENOMEM; + dst = page_folio(newpage); + *dstp = dst; + + dst->private = NULL; + rc = __migrate_folio_unmap(src, dst, force, avoid_force_lock, mode); + if (rc == MIGRATEPAGE_UNMAP) + return rc; + + /* + * A folio that has not been unmapped will be restored to + * right list unless we want to retry. + */ + if (rc != -EAGAIN && rc != -EDEADLOCK) + list_move_tail(&src->lru, ret); + + if (put_new_page) + put_new_page(&dst->page, private); + else + folio_put(dst); + + return rc; +} + static int __migrate_folio_move(struct folio *src, struct folio *dst, enum migrate_mode mode) { @@ -1296,56 +1346,6 @@ out_unlock_both: return rc; } -/* Obtain the lock on page, remove all ptes. */ -static int migrate_folio_unmap(new_page_t get_new_page, free_page_t put_new_page, - unsigned long private, struct folio *src, - struct folio **dstp, int force, bool avoid_force_lock, - enum migrate_mode mode, enum migrate_reason reason, - struct list_head *ret) -{ - struct folio *dst; - int rc = MIGRATEPAGE_UNMAP; - struct page *newpage = NULL; - - if (!thp_migration_supported() && folio_test_transhuge(src)) - return -ENOSYS; - - if (folio_ref_count(src) == 1) { - /* Folio was freed from under us. So we are done. */ - folio_clear_active(src); - folio_clear_unevictable(src); - /* free_pages_prepare() will clear PG_isolated. */ - list_del(&src->lru); - migrate_folio_done(src, reason); - return MIGRATEPAGE_SUCCESS; - } - - newpage = get_new_page(&src->page, private); - if (!newpage) - return -ENOMEM; - dst = page_folio(newpage); - *dstp = dst; - - dst->private = NULL; - rc = __migrate_folio_unmap(src, dst, force, avoid_force_lock, mode); - if (rc == MIGRATEPAGE_UNMAP) - return rc; - - /* - * A folio that has not been unmapped will be restored to - * right list unless we want to retry. - */ - if (rc != -EAGAIN && rc != -EDEADLOCK) - list_move_tail(&src->lru, ret); - - if (put_new_page) - put_new_page(&dst->page, private); - else - folio_put(dst); - - return rc; -} - /* Migrate the folio to the newly allocated folio in dst. */ static int migrate_folio_move(free_page_t put_new_page, unsigned long private, struct folio *src, struct folio *dst,