From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hugh Dickins <hugh@veritas.com>
Date: Sat, 28 Apr 2007 05:20:02 +0000
Subject: Re: Fw: [PATCH] ia64: race flushing icache in do_no_page path
Message-Id: <Pine.LNX.4.64.0704280616470.9554@blonde.wat.veritas.com>
List-Id: <linux-ia64.vger.kernel.org>
References: <20070425205548.fd51b301.akpm@linux-foundation.org> 
 <46305A8D.2080003@yahoo.com.au> <20070426173544.GA30744@ldl.fc.hp.com> 
 <4631E49C.2030501@yahoo.com.au> <1177723479.13482.371.camel@galaxy.corp.google.com>
 <4632AAB4.6030303@yahoo.com.au> <4632B9C8.40400@yahoo.com.au>
In-Reply-To: <4632B9C8.40400@yahoo.com.au>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: rohitseth@google.com, Mike Stroyan <mike.stroyan@hp.com>, Andrew Morton <akpm@linux-foundation.org>, "Luck, Tony" <tony.luck@intel.com>, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org

On Sat, 28 Apr 2007, Nick Piggin wrote:
> 
> OIC, you need a virtual address to evict the icache, so you can't
> flush at flush_dcache time? Or does ia64 have an instruction to
> flush the whole icache? (it would be worth testing, to see how much
> performance suffers).

I'm puzzled by that remark: the ia64 flush_icache_range always has
a virtual address, it uses the kernel virtual address; it takes no
interest in whether there's a user virtual address.

Hugh