Re: [PATCH v4 2/7] mm: memory_failure: Allow truncate_error_folio to return MF_DELAYED

[David Hildenbrand (Arm)]

On 6/2/26 23:55, Lisa Wang wrote:
> The .error_remove_folio a_ops is used by different filesystems to handle
> folio truncation upon discovery of a memory failure in the memory
> associated with the given folio.
> 
> Currently, MF_DELAYED is treated as an error, causing "Failed to punch
> page" to be written to the console. MF_DELAYED is then relayed to the
> caller of truncate_error_folio() as MF_FAILED. This further causes
> memory_failure() to return -EBUSY, which then always causes a SIGBUS.
> 
> This is also implies that regardless of whether the thread's memory
> corruption kill policy is PR_MCE_KILL_EARLY or PR_MCE_KILL_LATE, a
> memory failure with MF_DELAYED will always cause a SIGBUS.
> 
> Update truncate_error_folio() to return MF_DELAYED to the caller if the
> .error_remove_folio() callback reports MF_DELAYED.
> 
> Signed-off-by: Lisa Wang <wyihan@xxxxxxxxxx>
> ---

Acked-by: David Hildenbrand (Arm) <david@xxxxxxxxxx>

-- 
Cheers,

David