linux-kernel - Re: [PATCH 2/4 v2] mm: fix possible incorrect return value of migrate

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Message-ID: <alpine.DEB.2.00.1207170925250.13599@router.home>
Date:	Tue, 17 Jul 2012 09:28:09 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Sasha Levin <levinsasha928@...il.com>
Subject: Re: [PATCH 2/4 v2] mm: fix possible incorrect return value of
 migrate_pages() syscall

On Tue, 17 Jul 2012, Joonsoo Kim wrote:

> @@ -1382,6 +1382,8 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
>
>  	err = do_migrate_pages(mm, old, new,
>  		capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
> +	if (err > 0)
> +		err = -EBUSY;
>
>  	mmput(mm);
>  out:

Why not have do_migrate_pages() return EBUSY if we do not need the number
of failed/retried pages?

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