linux-kernel - Re: [Revert] Re: [PATCH] mm: sync vmalloc address space page tables in alloc_vm

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Message-ID: <4E5FED1A.1000300@goop.org>
Date:	Thu, 01 Sep 2011 13:37:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"namhyung@...il.com" <namhyung@...il.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [Revert] Re: [PATCH] mm: sync vmalloc address space page tables
 in alloc_vm_area()

On 09/01/2011 09:11 AM, Konrad Rzeszutek Wilk wrote:
> On Thu, Sep 01, 2011 at 12:51:03PM +0100, David Vrabel wrote:
>> From: David Vrabel <david.vrabel@...rix.com>
> Andrew,
>
> I was wondering if you would be Ok with this patch for 3.1.
>
> It is a revert (I can prepare a proper revert if you would like
> that instead of this patch).
>
> The users of this particular function (alloc_vm_area) are just
> Xen. There are no others.

I'd prefer to put explicit vmalloc_sync_all()s in the callsites where
necessary, and ultimately try to work out ways of avoiding it altogether
(like have some hypercall wrapper which touches the arg memory to make
sure its mapped?).

    J
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