linux-kernel - Re: Fw: [PATCH] ia64: race flushing icache in do_no

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Message-ID: <Pine.LNX.4.64.0704280616470.9554@blonde.wat.veritas.com>
Date:	Sat, 28 Apr 2007 06:20:02 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	rohitseth@...gle.com, Mike Stroyan <mike.stroyan@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Luck, Tony" <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Fw: [PATCH] ia64: race flushing icache in do_no_page path

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
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