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mm/swapfile: use list_{prev,next}_entry() instead of open-coding 

Use list_{prev,next}_entry() instead of list_entry() for better
code readability.

Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Baoquan He <bhe@redhat.com>
Link: http://lkml.kernel.org/r/1586599916-15456-2-git-send-email-qiwuchen55@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
chenqiwu 2020-06-01 21:48:36 -07:00 committed by Linus Torvalds
parent 548b6a1e55
commit 213516ac07
1 changed files with 6 additions and 10 deletions
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16
mm/swapfile.c
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@ -3654,7 +3654,7 @@ static bool swap_count_continued(struct swap_info_struct *si,
spin_lock(&si->cont_lock);
offset &= ~PAGE_MASK;
page = list_entry(head->lru.next, struct page, lru);
page = list_next_entry(head, lru);
map = kmap_atomic(page) + offset;
if (count == SWAP_MAP_MAX) /* initial increment from swap_map */
@ -3666,13 +3666,13 @@ static bool swap_count_continued(struct swap_info_struct *si,
*/
while (*map == (SWAP_CONT_MAX | COUNT_CONTINUED)) {
kunmap_atomic(map);
page = list_entry(page->lru.next, struct page, lru);
page = list_next_entry(page, lru);
BUG_ON(page == head);
map = kmap_atomic(page) + offset;
}
if (*map == SWAP_CONT_MAX) {
kunmap_atomic(map);
page = list_entry(page->lru.next, struct page, lru);
page = list_next_entry(page, lru);
if (page == head) {
ret = false; /* add count continuation */
goto out;
@ -3682,12 +3682,10 @@ init_map: *map = 0; /* we didn't zero the page */
}
*map += 1;
kunmap_atomic(map);
page = list_entry(page->lru.prev, struct page, lru);
while (page != head) {
while ((page = list_prev_entry(page, lru)) != head) {
map = kmap_atomic(page) + offset;
*map = COUNT_CONTINUED;
kunmap_atomic(map);
page = list_entry(page->lru.prev, struct page, lru);
}
ret = true; /* incremented */
@ -3698,7 +3696,7 @@ init_map: *map = 0; /* we didn't zero the page */
BUG_ON(count != COUNT_CONTINUED);
while (*map == COUNT_CONTINUED) {
kunmap_atomic(map);
page = list_entry(page->lru.next, struct page, lru);
page = list_next_entry(page, lru);
BUG_ON(page == head);
map = kmap_atomic(page) + offset;
}
@ -3707,13 +3705,11 @@ init_map: *map = 0; /* we didn't zero the page */
if (*map == 0)
count = 0;
kunmap_atomic(map);
page = list_entry(page->lru.prev, struct page, lru);
while (page != head) {
while ((page = list_prev_entry(page, lru)) != head) {
map = kmap_atomic(page) + offset;
*map = SWAP_CONT_MAX | count;
count = COUNT_CONTINUED;
kunmap_atomic(map);
page = list_entry(page->lru.prev, struct page, lru);
}
ret = count == COUNT_CONTINUED;
}