Re: [v2 PATCH] mm: move_pages: return valid node id in status if the page is already on the target node

[John Hubbard <jhubbard@nvidia.com>]

On 12/4/19 9:44 PM, John Hubbard wrote:
...           */
> 
> Let's change the comment above add_page_for_migration(), to read:
> 
>          /*
>           * Most errors in the page lookup or isolation are not fatal
>           * and we simply report them via the status array. However,
>           * positive error values are fatal.
>           */
> 
> 
>>           err = add_page_for_migration(mm, addr, current_node,
>> -                &pagelist, flags & MPOL_MF_MOVE_ALL);
>> +                &pagelist, flags & MPOL_MF_MOVE_ALL, status,
>> +                i);
>> +
>>           if (!err)
>>               continue;
>> +        /* store_status() failed in add_page_for_migration() */
> 
> ...and let's replace the above line, with the following:
> 

Correction, I experienced a fatal editor copy-paste mistake here. :) I meant to
suggest this:

		/*
		 * add_page_for_migration() experienced a fatal failure (see the
		 * comments in that routine for details).
		 */

> 
> 
>> +        if (err > 0) {
>> +            err = -EFAULT;
>> +            goto out_flush;
>> +        }
>> +
>>           err = store_status(status, i, err, 1);
>>           if (err)
>>               goto out_flush;
>>

thanks,
-- 
John Hubbard
NVIDIA