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

[Christoph Lameter]

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.

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