Re: [RESEND PATCH 2/4 v3] mm: fix possible incorrect return value ofmigrate_pages() syscall

[JoonSoo Kim]

2012/7/28 Christoph Lameter <cl@xxxxxxxxx>:
> On Sat, 28 Jul 2012, Joonsoo Kim wrote:
>
>> do_migrate_pages() can return the number of pages not migrated.
>> Because migrate_pages() syscall return this value directly,
>> migrate_pages() syscall may return the number of pages not migrated.
>> In fail case in migrate_pages() syscall, we should return error value.
>> So change err to -EBUSY
>
> Lets leave this alone. This would change the migrate_pages semantics
> because a successful move of N out of M pages would be marked as a
> total failure although pages were in fact moved.
>

Okay.
Then, do we need to fix man-page of migrate_pages() syscall?
According to man-page, only returning 0 or -1 is valid.
Without this patch, it can return positive value.
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