Re: [PATCH] mm/memory-failure: fix hardware poison check in unpoison_memory()

[Andrew Morton]

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.