linux-kernel - Re: cpuset: return -EINVAL for legacy non-subset child creation attempt

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Message-ID: <1449026802.3304.9.camel@gmx.de>
Date:	Wed, 02 Dec 2015 04:26:42 +0100
From:	Mike Galbraith <efault@....de>
To:	Zefan Li <lizefan@...wei.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: cpuset: return -EINVAL for legacy non-subset child creation
 attempt

On Wed, 2015-12-02 at 09:20 +0800, Zefan Li wrote:
> On 2015/12/1 23:22, Mike Galbraith wrote:
> > A legacy hierarchy child set that is not a subset of its parent is not
> > a permissions issue, it's an invalid configuration.  Return -EINVAL.
> >
> 
> It's sometimes arguable which errno should be used. In this case I don't
> see why we can't use EACCES. It's even documented in man page.
> 
>         EACCES Attempted to add, using write(2), a CPU  or  memory  node  to  a
>                cpuset, when that CPU or memory node was not already in its par-
>                ent.
> 
> Let's see another example. In mmap manual:
> 
> 	EACCES A  file descriptor refers to a non-regular file.
> 
> We can argue fd of a non-regular file is an invalid configuration, but
> here we return EACCES.

Ok, works for me (official -ENOPE -> gripee), thanks.

	-Mike

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