From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/3] ARM: iwmmxt: Port problematic iwmmxt support code to v7/Thumb-2
Date: Mon, 12 Sep 2011 15:43:13 +0100 [thread overview]
Message-ID: <20110912144313.GD7007@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110912143708.GB2020@arm.com>
On Mon, Sep 12, 2011 at 03:37:08PM +0100, Dave Martin wrote:
> Agreed, but the trouble is that what constitutes a suitable data
> dependency is completely microarchitecture dependent -- we're relying
> on side-effects outside the architecture here.
>
> We can't code _exactly_ the same thing in Thumb-2 because of restrictions
> in the instruction set, so we have to settle for something that "looks
> similar" -- but there's no guarantee it will work.
>
> Do you feel your judgement on this is authoritative? If so, then
> we can go ahead with your suggestion; otherwise we might need input
> from someone else.
How about we ask Haojian Zhuang what the recommended sequence is for
ensuring that writes hit CP15 when executing in Thumb-2 mode on PJ4,
instead of blindly beating around the issue without really knowing
what we're doing?
next prev parent reply other threads:[~2011-09-12 14:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-08 16:04 [PATCH v2 0/3] ARM: iwmmxt/pj4 fixes for v7/Thumb-2 Dave Martin
2011-09-08 16:04 ` [PATCH v2 1/3] ARM: iwmmxt: Fix Makefile rules for building iwmmxt for Thumb-2 Dave Martin
2011-09-08 16:45 ` Arnd Bergmann
2011-09-08 17:14 ` Dave Martin
2011-09-08 17:09 ` Nicolas Pitre
2011-09-08 16:04 ` [PATCH v2 2/3] ARM: iwmmxt: Port problematic iwmmxt support code to v7/Thumb-2 Dave Martin
2011-09-08 16:45 ` Arnd Bergmann
2011-09-08 17:03 ` Eric Miao
2011-09-08 17:13 ` Jon Medhurst (Tixy)
2011-09-08 17:15 ` Eric Miao
2011-09-08 17:33 ` Nicolas Pitre
2011-09-08 17:20 ` Dave Martin
2011-09-08 17:32 ` Nicolas Pitre
2011-09-08 18:49 ` Eric Miao
2011-09-08 19:30 ` Nicolas Pitre
2011-09-09 9:55 ` Jon Medhurst (Tixy)
2011-09-09 13:21 ` Nicolas Pitre
2011-09-09 14:05 ` Jon Medhurst (Tixy)
2011-09-09 16:41 ` Dave Martin
2011-09-09 17:51 ` Nicolas Pitre
2011-09-12 14:37 ` Dave Martin
2011-09-12 14:43 ` Russell King - ARM Linux [this message]
2011-09-12 14:55 ` Nicolas Pitre
2011-09-12 16:22 ` Dave Martin
2011-09-08 16:04 ` [PATCH v2 3/3] ARM: pxa/pj4: Port problematic pj4 " Dave Martin
2011-09-08 16:44 ` Arnd Bergmann
2011-09-08 17:06 ` Eric Miao
2011-09-08 17:23 ` Dave Martin
2011-09-08 17:06 ` Nicolas Pitre
2011-09-08 17:06 ` Eric Miao
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