linux-kernel - Re: [PATCH v2] NOMMU: implement vmap/vunmap with kmalloc

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Date:	Wed, 31 Mar 2010 15:54:36 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	David Howells <dhowells@...hat.com>
Cc:	uclinux-dev@...inux.org, David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH v2] NOMMU: implement vmap/vunmap with kmalloc

On Wednesday 31 March 2010 13:11:24 David Howells wrote:
> How about the attached patch instead?  I'd rather not make vmap() generally
> available in NOMMU mode since it can't be implemented in NOMMU mode.  Yes,
> vmap() can take a copy of the pages it is given, but you can't guarantee
> that's the right thing to do.  It's like a shared-writable mmap.
> 
> Instead, why not just override vmap() in firmware_class.c for the one
> instance where we know we're happy with this behaviour?

how about putting this implementation into like vmap_nommu() and only 
rewriting vmap() to vmap_nommu() when we know it's safe ?  such as this 
firmware case ?
-mike

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