mm: introduce wait_on_page_locked_killable()
commit 2687a356 ("Add lock_page_killable") introduced killable
lock_page(). Similarly this patch introdues killable
wait_on_page_locked().
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index c119506..ea26808 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -357,6 +357,15 @@
*/
extern void wait_on_page_bit(struct page *page, int bit_nr);
+extern int wait_on_page_bit_killable(struct page *page, int bit_nr);
+
+static inline int wait_on_page_locked_killable(struct page *page)
+{
+ if (PageLocked(page))
+ return wait_on_page_bit_killable(page, PG_locked);
+ return 0;
+}
+
/*
* Wait for a page to be unlocked.
*