mm,hwpoison: remove drain_all_pages from shake_page

get_hwpoison_page already drains pcplists, previously disabling them when
trying to grab a refcount.  We do not need shake_page to take care of it
anymore.

Link: https://lkml.kernel.org/r/20201204102558.31607-4-osalvador@suse.deSigned-off-by: NOscar Salvador <osalvador@suse.de>
Acked-by: NNaoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Qian Cai <qcai@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/memory-failure.c

@@ -263,8 +263,8 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
 }
 
 /*
- * When a unknown page type is encountered drain as many buffers as possible
- * in the hope to turn the page into a LRU or free page, which we can handle.
+ * Unknown page type encountered. Try to check whether it can turn PageLRU by
+ * lru_add_drain_all, or a free page by reclaiming slabs when possible.
  */
 void shake_page(struct page *p, int access)
 {
@@ -273,9 +273,6 @@ void shake_page(struct page *p, int access)
 
 	if (!PageSlab(p)) {
 		lru_add_drain_all();
-		if (PageLRU(p))
-			return;
-		drain_all_pages(page_zone(p));
 		if (PageLRU(p) || is_free_buddy_page(p))
 			return;
 	}