From: Jamie Lokier <jamie@shareable.org>
To: Tony Lindgren <tony@atomide.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] arm: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6
Date: Wed, 23 Jun 2010 14:28:14 +0100 [thread overview]
Message-ID: <20100623132814.GB7058@shareable.org> (raw)
In-Reply-To: <20100623092843.GC12255@atomide.com>
Tony Lindgren wrote:
> > Also problematical with XIP - if we go down the route of implementing
> > these by copying code fragments into the kernel, we need to strip out
> > XIP support or implement a second way. Obviously having a second way
> > adds maintainence burden, and the second way will probably lose out
> > on updates.
>
> How about if we implement the default XIP-safe unoptimized functions,
> with minimal iffdeffery and then allow optional override for non-XIP
> kernels from mm/proc-*.S files?
That might be a plan for some things like cache maintenance - skip a
function call when not needed, call direct instead of indirect, but
for XIP that status quo must remain.
-- Jamie
WARNING: multiple messages have this Message-ID (diff)
From: jamie@shareable.org (Jamie Lokier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] arm: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6
Date: Wed, 23 Jun 2010 14:28:14 +0100 [thread overview]
Message-ID: <20100623132814.GB7058@shareable.org> (raw)
In-Reply-To: <20100623092843.GC12255@atomide.com>
Tony Lindgren wrote:
> > Also problematical with XIP - if we go down the route of implementing
> > these by copying code fragments into the kernel, we need to strip out
> > XIP support or implement a second way. Obviously having a second way
> > adds maintainence burden, and the second way will probably lose out
> > on updates.
>
> How about if we implement the default XIP-safe unoptimized functions,
> with minimal iffdeffery and then allow optional override for non-XIP
> kernels from mm/proc-*.S files?
That might be a plan for some things like cache maintenance - skip a
function call when not needed, call direct instead of indirect, but
for XIP that status quo must remain.
-- Jamie
next prev parent reply other threads:[~2010-06-23 13:28 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-21 13:51 [PATCH 0/2] Make ARMv6 behave with TLS, VFPv3, and NEON Tony Lindgren
2010-06-21 13:51 ` Tony Lindgren
2010-06-21 13:51 ` [PATCH 1/2] arm: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6 Tony Lindgren
2010-06-21 13:51 ` Tony Lindgren
2010-06-22 9:28 ` Tony Lindgren
2010-06-22 9:28 ` Tony Lindgren
2010-06-22 17:00 ` Jamie Lokier
2010-06-22 17:00 ` Jamie Lokier
2010-06-23 7:39 ` Tony Lindgren
2010-06-23 7:39 ` Tony Lindgren
2010-06-23 8:12 ` Russell King - ARM Linux
2010-06-23 8:12 ` Russell King - ARM Linux
2010-06-23 9:28 ` Tony Lindgren
2010-06-23 9:28 ` Tony Lindgren
2010-06-23 9:32 ` Russell King - ARM Linux
2010-06-23 9:32 ` Russell King - ARM Linux
2010-06-23 13:28 ` Jamie Lokier [this message]
2010-06-23 13:28 ` Jamie Lokier
2010-06-23 13:36 ` Jamie Lokier
2010-06-23 13:36 ` Jamie Lokier
2010-06-23 14:19 ` Nicolas Pitre
2010-06-23 14:19 ` Nicolas Pitre
2010-06-24 0:28 ` Jamie Lokier
2010-06-24 0:28 ` Jamie Lokier
2010-06-29 14:18 ` Tony Lindgren
2010-06-29 14:18 ` Tony Lindgren
2010-06-29 19:20 ` Nicolas Pitre
2010-06-29 19:20 ` Nicolas Pitre
2010-06-30 11:08 ` Tony Lindgren
2010-06-30 11:08 ` Tony Lindgren
2010-06-30 13:17 ` Tony Lindgren
2010-06-30 13:17 ` Tony Lindgren
2010-06-30 14:42 ` Nicolas Pitre
2010-06-30 14:42 ` Nicolas Pitre
2010-07-01 9:25 ` Tony Lindgren
2010-07-01 9:25 ` Tony Lindgren
2010-07-01 17:40 ` Jamie Lokier
2010-07-01 17:40 ` Jamie Lokier
2010-07-02 2:37 ` Nicolas Pitre
2010-07-02 2:37 ` Nicolas Pitre
2010-07-02 10:37 ` Tony Lindgren
2010-07-02 10:37 ` Tony Lindgren
2010-07-05 13:55 ` Tony Lindgren
2010-07-05 13:55 ` Tony Lindgren
2011-04-08 3:39 ` Li Li
2011-04-08 3:39 ` Li Li
2011-04-08 13:19 ` Nicolas Pitre
2011-04-08 13:19 ` Nicolas Pitre
2011-04-08 13:35 ` Li Li
2011-04-08 13:35 ` Li Li
2011-04-08 14:35 ` Jamie Lokier
2011-04-08 14:35 ` Jamie Lokier
2011-04-08 14:40 ` Li Li
2011-04-08 14:40 ` Li Li
2010-06-21 13:51 ` [PATCH 2/2] arm: Make VFPv3 usable on ARMv6 Tony Lindgren
2010-06-21 13:51 ` Tony Lindgren
2010-06-22 12:59 ` Catalin Marinas
2010-06-22 12:59 ` Catalin Marinas
2010-06-22 13:20 ` Tony Lindgren
2010-06-22 13:20 ` Tony Lindgren
2010-06-23 7:57 ` Tony Lindgren
2010-06-23 7:57 ` Tony Lindgren
2010-06-25 13:50 ` Catalin Marinas
2010-06-25 13:50 ` Catalin Marinas
2010-07-01 12:42 ` Tony Lindgren
2010-07-01 12:42 ` Tony Lindgren
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