Re: [PATCH] mm/migrate.c: also overwrite error when it is bigger than zero

[Wei Yang]

On Fri, Jan 17, 2020 at 05:38:10PM -0800, Mike Kravetz wrote:
>On 1/17/20 3:48 PM, Wei Yang wrote:
>> This is another point I think current code is not working well. And actually,
>> the behavior is not well defined or our kernel is broken for a while.
>> 
>> When you look at the man page, it says:
>> 
>>     RETURN VALUE
>>            On success move_pages() returns zero.  On error, it returns -1, and sets errno to indicate the error
>> 
>
>Is this from your migrate_pages(2) man page?
>

It is from my move_pages(2) man page.

>The latest version of the migrate_pages(2) man page in the git repo has this
>for RETURN VALUE.
>
>RETURN VALUE
>       On  success  migrate_pages() returns the number of pages that could not
>       be moved (i.e., a return of zero means that all pages were successfully
>       moved).  On error, it returns -1, and sets errno to indicate the error.
>
>-- 
>Mike Kravetz

-- 
Wei Yang
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