18 Jul
2023
18 Jul
'23
2:25 p.m.
On 7/17/23 12:00 PM, Andrew Morton wrote:
On Mon, 17 Jul 2023 11:18:12 -0700 Sidhartha Kumar sidhartha.kumar@oracle.com wrote:
It was pointed out[1] that using folio_test_hwpoison() is wrong as we need to check the indiviual page that has poison. folio_test_hwpoison() only checks the head page so go back to using PageHWPoison().
Please describe the user-visible effects of the bug, especially when proposing a -stable backport.
User-visible effects include existing hwpoison-inject tests possibly failing as unpoisoning a single subpage could lead to unpoisoning an entire folio. Memory unpoisoning could also not work as expected as the function will break early due to only checking the head page and not the actually poisoned subpage.