From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Nicolas Pitre" <nicolas.pitre@linaro.org>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Måns Rullgård" <mans@mansr.com>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Stephen Boyd" <sboyd@codeaurora.org>,
"lkml - Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Christopher Covington" <cov@codeaurora.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC/PATCH 0/3] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions
Date: Tue, 24 Nov 2015 10:42:26 +0000 [thread overview]
Message-ID: <20151124104225.GA8644@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <4485320.CGMJdfZLya@wuerfel>
On Tue, Nov 24, 2015 at 11:38:53AM +0100, Arnd Bergmann wrote:
> I suggested using -mcpu=cortex-a15 because there are old gcc versions
> that don't know about -march=armv7ve or -march=armv7-a+idiv yet, but
> that do understand -mcpu=cortex-a15.
That's not all. The bigger problem is that there are toolchains out
there which accept these options, but do _not_ support IDIV in either
ARM or Thumb mode. I'm afraid that makes it impossible to add this
feature to the mainline kernel in this form: we need to run a test
build to check that -march=armv7ve or what-not really does work
through both GCC and GAS.
Given that Ubuntu 14.04 LTS suffers with this, it's something that
must be resolved.
--
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-11-24 10:42 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-21 1:23 [RFC/PATCH 0/3] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions Stephen Boyd
2015-11-21 1:23 ` [RFC/PATCH 1/3] scripts: Allow recordmcount to be used without tracing enabled Stephen Boyd
2015-11-21 1:23 ` [RFC/PATCH 2/3] recordmcount: Record locations of __aeabi_{u}idiv() calls on ARM Stephen Boyd
2015-11-21 10:13 ` Russell King - ARM Linux
2015-11-23 20:53 ` Stephen Boyd
2015-11-23 20:58 ` Steven Rostedt
2015-11-23 21:03 ` Russell King - ARM Linux
2015-11-23 21:16 ` Stephen Boyd
2015-11-23 21:33 ` Russell King - ARM Linux
2015-11-24 1:04 ` Stephen Boyd
2015-11-21 1:23 ` [RFC/PATCH 3/3] ARM: Replace calls to __aeabi_{u}idiv with udiv/sdiv instructions Stephen Boyd
2015-11-21 11:50 ` Måns Rullgård
2015-11-23 20:49 ` Stephen Boyd
2015-11-23 20:54 ` Måns Rullgård
2015-11-23 21:16 ` Stephen Boyd
2015-11-21 20:39 ` [RFC/PATCH 0/3] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions Arnd Bergmann
2015-11-21 20:45 ` Måns Rullgård
2015-11-21 21:00 ` Arnd Bergmann
2015-11-21 22:11 ` Måns Rullgård
2015-11-21 23:14 ` Arnd Bergmann
2015-11-21 23:21 ` Arnd Bergmann
2015-11-22 13:29 ` Peter Maydell
2015-11-22 19:25 ` Arnd Bergmann
2015-11-22 19:30 ` Måns Rullgård
2015-11-22 19:47 ` Russell King - ARM Linux
2015-11-22 19:58 ` Arnd Bergmann
2015-11-22 20:03 ` Russell King - ARM Linux
2015-11-22 20:37 ` Arnd Bergmann
2015-11-22 20:39 ` Måns Rullgård
2015-11-22 21:18 ` Arnd Bergmann
2015-11-23 2:36 ` Nicolas Pitre
2015-11-23 8:15 ` Arnd Bergmann
2015-11-23 14:14 ` Christopher Covington
2015-11-23 15:32 ` Arnd Bergmann
2015-11-23 20:38 ` Stephen Boyd
2015-11-23 21:19 ` Arnd Bergmann
2015-11-23 21:32 ` Stephen Boyd
2015-11-23 21:57 ` Arnd Bergmann
2015-11-23 23:13 ` Stephen Boyd
2015-11-24 10:17 ` Arnd Bergmann
2015-11-24 12:15 ` Måns Rullgård
2015-11-24 13:45 ` Arnd Bergmann
2015-11-25 1:51 ` Stephen Boyd
2015-11-25 7:21 ` Arnd Bergmann
2015-11-24 0:13 ` Stephen Boyd
2015-11-24 8:53 ` Stephen Boyd
2015-11-24 10:38 ` Arnd Bergmann
2015-11-24 10:42 ` Russell King - ARM Linux [this message]
2015-11-24 12:10 ` Måns Rullgård
2015-11-24 12:23 ` Russell King - ARM Linux
2015-11-24 12:29 ` Måns Rullgård
2015-11-24 14:00 ` Russell King - ARM Linux
2015-11-24 14:03 ` Måns Rullgård
2015-11-24 10:39 ` Russell King - ARM Linux
2015-11-24 20:07 ` Stephen Boyd
2015-11-24 20:35 ` Russell King - ARM Linux
2015-11-24 21:11 ` Arnd Bergmann
2016-01-13 1:51 ` Stephen Boyd
2015-11-24 10:37 ` Russell King - ARM Linux
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