linux-kernel - Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT

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Message-ID: <20081007175412.0d88da30@lxorguk.ukuu.org.uk>
Date:	Tue, 7 Oct 2008 17:54:12 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Hugh Dickins <hugh@...itas.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT_FIXED

On Tue,  7 Oct 2008 19:15:17 +0300
"Kirill A. Shutemov" <kirill@...temov.name> wrote:

> If SHM_MAP_NOT_FIXED specified and shmaddr is not NULL, then the kernel takes
> shmaddr as a hint about where to place the mapping. The address of the mapping
> is returned as the result of the call.
> 
> It's similar to mmap() without MAP_FIXED.

NAK

This is a pointless API extension tacked onto a historic interface that
isn't well designed.

Use shm_open, and mmap and you get the functionality required using
modern posix interfaces with *NO* Linux extensions involved.

Alan
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