linux-kernel - Re: [PATCH] mm/process_vm

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Message-ID: <20140526195341.GQ18016@ZenIV.linux.org.uk>
Date:	Mon, 26 May 2014 20:53:41 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Konstantin Khlebnikov <koct9i@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/process_vm_access: move into ipc/

On Mon, May 26, 2014 at 12:16:20PM -0700, Hugh Dickins wrote:
> On Sat, 24 May 2014, Konstantin Khlebnikov wrote:
> 
> > "CROSS_MEMORY_ATTACH" and mm/process_vm_access.c seems misnamed and misplaced.
> > Actually it's a kind of IPC and it has no more relation to MM than sys_read().
> > This patch moves code into ipc/ and config option into init/Kconfig.
> > 
> > Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>
> 
> I disagree, and SysV's ipc/ isn't where I would expect to find it.
> How about we just leave it where it is in mm?

Anything playing with get_user_pages(tsk, ...) with tsk != current is very
much a part of VM guts.

While we are at it, do_generic_file_read() *is* in mm/filemap.c.  And signals
and pipes are also "a kind of IPC", so the rationale is really weak.
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