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mm/memcg: revise the using condition of lock_page_lruvec function series 

lock_page_lruvec() and its variants are safe to use under the same
conditions as commit_charge(): add lock_page_memcg() to the comment.

Polished with Hugh Dickins' suggestions, thanks!

Link: https://lkml.kernel.org/r/1608614453-10739-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Shi 2021-02-24 12:03:47 -08:00 committed by Linus Torvalds
parent fff66b79a1
commit d7e3aba583
1 changed files with 5 additions and 4 deletions
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9
mm/memcontrol.c
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@ -1346,10 +1346,11 @@ void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
* lock_page_lruvec - lock and return lruvec for a given page.
* @page: the page
*
* This series functions should be used in either conditions:
* PageLRU is cleared or unset
* or page->_refcount is zero
* or page is locked.
* These functions are safe to use under any of the following conditions:
* - page locked
* - PageLRU cleared
* - lock_page_memcg()
* - page->_refcount is zero
*/
struct lruvec *lock_page_lruvec(struct page *page)
{