Re: [PATCH v2 1/2] mm: soft-offline: return -EBUSY if set_hwpoison_free_buddy_page() fails

From: Anshuman Khandual
Date: Tue Jun 11 2019 - 04:19:00 EST

On 06/11/2019 06:27 AM, Naoya Horiguchi wrote:
> On Mon, Jun 10, 2019 at 05:19:45PM -0700, Mike Kravetz wrote:
>> On 6/10/19 1:18 AM, Naoya Horiguchi wrote:
>>> The pass/fail of soft offline should be judged by checking whether the
>>> raw error page was finally contained or not (i.e. the result of
>>> set_hwpoison_free_buddy_page()), but current code do not work like that.
>>> So this patch is suggesting to fix it.
>>> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
>>> Fixes: 6bc9b56433b76 ("mm: fix race on soft-offlining")
>>> Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
>> Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
> Thank you, Mike.
>> To follow-up on Andrew's comment/question about user visible effects. Without
>> this fix, there are cases where madvise(MADV_SOFT_OFFLINE) may not offline the
>> original page and will not return an error.
> Yes, that's right.

Then should this be included in the commit message as well ?