On 7/17/23 12:00 PM, Andrew Morton wrote:
On Mon, 17 Jul 2023 11:18:12 -0700 Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx> 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.
