On 05/17/2016 09:42 AM, Naoya Horiguchi wrote:
There's a race window between checking page->flags and unpoisoning, which taints kernel with "BUG: Bad page state". That's overkill. It's safer to use bad_flags to detect hwpoisoned page. Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> --- mm/page_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git tmp/mm/page_alloc.c tmp_patched/mm/page_alloc.c index 5b269bc..4e0fa37 100644 --- tmp/mm/page_alloc.c +++ tmp_patched/mm/page_alloc.c @@ -522,8 +522,8 @@ static void bad_page(struct page *page, const char *reason, static unsigned long nr_shown; static unsigned long nr_unshown; - /* Don't complain about poisoned pages */ - if (PageHWPoison(page)) { + /* Don't complain about hwpoisoned pages */ + if (bad_flags == __PG_HWPOISON) {
This will wrongly return prematurely on !CONFIG_MEMORY_FAILURE where __PG_HWPOISON == 0 and bad_page() called for other reasons than bad flags?
page_mapcount_reset(page); /* remove PageBuddy */ return; }
-- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>