mm,hwpoison: drop unneeded pcplist draining

memory_failure and soft_offline_path paths now drain pcplists by calling
get_hwpoison_page.

memory_failure flags the page as HWPoison before, so that page cannot
longer go into a pcplist, and soft_offline_page only flags a page as
HWPoison if 1) we took the page off a buddy freelist 2) the page was
in-use and we migrated it 3) was a clean pagecache.

Because of that, a page cannot longer be poisoned and be in a pcplist.

Link: https://lkml.kernel.org/r/20201013144447.6706-5-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/madvise.c b/mm/madvise.c
index 13f5677..fe5c232 100644 (file)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -877,7 +877,6 @@ static long madvise_remove(struct vm_area_struct *vma,
 static int madvise_inject_error(int behavior,
                unsigned long start, unsigned long end)
 {
-       struct zone *zone;
        unsigned long size;
 
        if (!capable(CAP_SYS_ADMIN))
@@ -922,10 +921,6 @@ static int madvise_inject_error(int behavior,
                        return ret;
        }
 
-       /* Ensure that all poisoned pages are removed from per-cpu lists */
-       for_each_populated_zone(zone)
-               drain_all_pages(zone);
-
        return 0;
 }
 #endif