From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/6] ARM: prefetch: remove redundant "cc" clobber
Date: Wed, 24 Jul 2013 11:19:51 +0100 [thread overview]
Message-ID: <20130724101950.GG9629@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <alpine.LFD.2.03.1307231547010.15022@syhkavp.arg>
Hi Nicolas,
On Tue, Jul 23, 2013 at 08:48:11PM +0100, Nicolas Pitre wrote:
> On Tue, 23 Jul 2013, Will Deacon wrote:
>
> > The pld instruction does not affect the condition flags, so don't bother
> > clobbering them.
> >
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
>
> Acked-by: Nicolas Pitre <nico@linaro.org>
Thanks for reviewing the series, much appreciated.
> You know the legacy reason why the cc clobber was there, right?
> It certainly doesn't apply anymore.
I was under the impression that it was due to ancient GCC behaviour and the "cc"
was there to prevent re-ordering. For interest, what are the specifics?
Cheers,
Will
next prev parent reply other threads:[~2013-07-24 10:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-23 11:36 [PATCH 0/6] Add support for pldw instruction on v7 MP cores Will Deacon
2013-07-23 11:36 ` [PATCH 1/6] ARM: prefetch: remove redundant "cc" clobber Will Deacon
2013-07-23 19:48 ` Nicolas Pitre
2013-07-24 10:19 ` Will Deacon [this message]
2013-07-24 16:16 ` Nicolas Pitre
2013-07-24 16:35 ` Will Deacon
2013-07-24 16:58 ` Russell King - ARM Linux
2013-07-24 17:22 ` Nicolas Pitre
2013-07-23 11:36 ` [PATCH 2/6] ARM: smp_on_up: move inline asm ALT_SMP patching macro out of spinlock.h Will Deacon
2013-07-23 19:55 ` Nicolas Pitre
2013-07-23 11:36 ` [PATCH 3/6] ARM: prefetch: add support for prefetchw using pldw on SMP ARMv7+ CPUs Will Deacon
2013-07-23 20:05 ` Nicolas Pitre
2013-07-24 10:42 ` Will Deacon
2013-07-23 11:36 ` [PATCH 4/6] ARM: locks: prefetch the destination word for write prior to strex Will Deacon
2013-07-23 20:10 ` Nicolas Pitre
2013-07-24 11:18 ` Will Deacon
2013-07-25 17:31 ` Stephen Boyd
2013-07-25 17:37 ` Stephen Boyd
2013-07-25 17:45 ` Will Deacon
2013-07-25 17:48 ` Will Deacon
2013-07-25 17:55 ` Stephen Boyd
2013-07-25 18:05 ` Will Deacon
2013-07-25 18:22 ` Stephen Boyd
2013-07-25 20:24 ` Nicolas Pitre
2013-07-26 10:34 ` Will Deacon
2013-07-26 14:46 ` Nicolas Pitre
2013-07-23 11:36 ` [PATCH 5/6] ARM: atomics: " Will Deacon
2013-07-23 20:12 ` Nicolas Pitre
2013-07-23 11:36 ` [PATCH 6/6] ARM: bitops: " Will Deacon
2013-07-23 20:15 ` Nicolas Pitre
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