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Date: Sat, 28 Apr 2007 06:20:02 +0100 (BST)
From: Hugh Dickins <hugh@veritas.com>
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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
Subject: Re: Fw: [PATCH] ia64: race flushing icache in do_no_page path
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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