linux-kernel - Re: MMIO and gcc re-ordering issue

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Message-ID: <18511.24732.191606.794160@cargo.ozlabs.ibm.com>
Date:	Wed, 11 Jun 2008 15:20:28 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	Trent Piepho <tpiepho@...escale.com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, linux-arch@...r.kernel.org,
	scottwood@...escale.com, linuxppc-dev@...abs.org,
	alan@...rguk.ukuu.org.uk, linux-kernel@...r.kernel.org
Subject: Re: MMIO and gcc re-ordering issue

Nick Piggin writes:

> Now that doesn't leave waker ordering architectures lumped with "slow old
> x86 semantics". Think of it as giving them the benefit of sharing x86
> development and testing :)

Worth something, but not perhaps as much as you think, given that many
x86 driver writers still don't pay much attention to making their code
endian-safe and 64-bit-clean.  And there are still plenty of drivers
that use virt_to_bus...

Paul.
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