From: linux@armlinux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: add a private asm/unaligned.h
Date: Mon, 30 Oct 2017 17:13:53 +0000 [thread overview]
Message-ID: <20171030171353.GD27404@n2100.armlinux.org.uk> (raw)
In-Reply-To: <CAK8P3a37pQZPzLbh_qCtDqz0=Ends+nnV3-Y1KJKZVxiRErFfQ@mail.gmail.com>
On Mon, Oct 30, 2017 at 06:01:44PM +0100, Arnd Bergmann wrote:
> Right, either fail the build or use the workaround from the gcc bugzilla,
> passing -fno-store-merging to the broken compilers avoids the problem
> reliably at the cost of slightly worse code. For the decompressor, we might
> also get away with passing -march=armv5t (not armv5te), which has
> experimentally been found to avoid the problem and produce better code
> than "-march=armv6 -fno-store-merging" as it avoids the strd instruction
> but not other store merging.
Depends how important the compilers are...
We currently refuse to build using these compilers:
gcc = 3.x where x < 3
gcc = 4.x where x < 3 if unwinding is enabled
gcc = 4.8.x where x < 3
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync@8.8Mbps down 630kbps up
According to speedtest.net: 8.21Mbps down 510kbps up
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Robert Jarzmik <robert.jarzmik@free.fr>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
LKML <linux-kernel@vger.kernel.org>,
Andrea Adami <andrea.adami@gmail.com>,
Gregory CLEMENT <gregory.clement@free-electrons.com>,
Romain Izard <romain.izard.pro@gmail.com>,
Sven Schmidt <4sschmid@informatik.uni-hamburg.de>,
Petr Cvek <petrcvekcz@gmail.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] ARM: add a private asm/unaligned.h
Date: Mon, 30 Oct 2017 17:13:53 +0000 [thread overview]
Message-ID: <20171030171353.GD27404@n2100.armlinux.org.uk> (raw)
In-Reply-To: <CAK8P3a37pQZPzLbh_qCtDqz0=Ends+nnV3-Y1KJKZVxiRErFfQ@mail.gmail.com>
On Mon, Oct 30, 2017 at 06:01:44PM +0100, Arnd Bergmann wrote:
> Right, either fail the build or use the workaround from the gcc bugzilla,
> passing -fno-store-merging to the broken compilers avoids the problem
> reliably at the cost of slightly worse code. For the decompressor, we might
> also get away with passing -march=armv5t (not armv5te), which has
> experimentally been found to avoid the problem and produce better code
> than "-march=armv6 -fno-store-merging" as it avoids the strd instruction
> but not other store merging.
Depends how important the compilers are...
We currently refuse to build using these compilers:
gcc = 3.x where x < 3
gcc = 4.x where x < 3 if unwinding is enabled
gcc = 4.8.x where x < 3
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up
According to speedtest.net: 8.21Mbps down 510kbps up
next prev parent reply other threads:[~2017-10-30 17:13 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 20:01 [PATCH] ARM: add a private asm/unaligned.h Arnd Bergmann
2017-10-20 20:01 ` Arnd Bergmann
2017-10-20 20:22 ` Ard Biesheuvel
2017-10-20 20:22 ` Ard Biesheuvel
2017-10-23 15:04 ` Romain Izard
2017-10-23 15:04 ` Romain Izard
2017-10-27 15:19 ` Gregory CLEMENT
2017-10-27 15:19 ` Gregory CLEMENT
2017-10-27 15:27 ` Russell King - ARM Linux
2017-10-27 15:27 ` Russell King - ARM Linux
2017-10-30 13:48 ` Gregory CLEMENT
2017-10-30 13:48 ` Gregory CLEMENT
2017-10-30 14:55 ` Ard Biesheuvel
2017-10-30 14:55 ` Ard Biesheuvel
2017-10-30 15:05 ` Gregory CLEMENT
2017-10-30 15:05 ` Gregory CLEMENT
2017-10-30 15:07 ` Ard Biesheuvel
2017-10-30 15:07 ` Ard Biesheuvel
2017-10-30 15:09 ` Gregory CLEMENT
2017-10-30 15:09 ` Gregory CLEMENT
2017-10-30 15:20 ` Ard Biesheuvel
2017-10-30 15:20 ` Ard Biesheuvel
2017-10-30 15:33 ` Gregory CLEMENT
2017-10-30 15:33 ` Gregory CLEMENT
2017-10-30 15:35 ` Ard Biesheuvel
2017-10-30 15:35 ` Ard Biesheuvel
2017-10-30 15:40 ` Gregory CLEMENT
2017-10-30 15:40 ` Gregory CLEMENT
2017-10-30 16:59 ` Russell King - ARM Linux
2017-10-30 16:59 ` Russell King - ARM Linux
2017-10-30 15:55 ` Russell King - ARM Linux
2017-10-30 15:55 ` Russell King - ARM Linux
2017-10-30 16:04 ` Gregory CLEMENT
2017-10-30 16:04 ` Gregory CLEMENT
2017-10-30 15:48 ` Russell King - ARM Linux
2017-10-30 15:48 ` Russell King - ARM Linux
2017-10-30 16:01 ` Gregory CLEMENT
2017-10-30 16:12 ` Russell King - ARM Linux
2017-10-30 16:12 ` Russell King - ARM Linux
2017-10-30 16:24 ` Gregory CLEMENT
2017-10-30 16:24 ` Gregory CLEMENT
2017-10-30 16:38 ` Russell King - ARM Linux
2017-10-30 16:38 ` Russell King - ARM Linux
2017-10-31 12:47 ` Russell King - ARM Linux
2017-10-31 12:47 ` Russell King - ARM Linux
2017-10-31 12:57 ` Ard Biesheuvel
2017-10-31 12:57 ` Ard Biesheuvel
2017-10-31 13:22 ` Gregory CLEMENT
2017-10-31 13:22 ` Gregory CLEMENT
2017-11-01 15:57 ` Ard Biesheuvel
2017-11-01 15:57 ` Ard Biesheuvel
2017-11-01 18:00 ` Russell King - ARM Linux
2017-11-01 18:00 ` Russell King - ARM Linux
2017-11-01 18:02 ` Ard Biesheuvel
2017-11-01 18:02 ` Ard Biesheuvel
2017-11-01 18:11 ` Russell King - ARM Linux
2017-11-01 18:11 ` Russell King - ARM Linux
2017-11-01 18:20 ` Ard Biesheuvel
2017-11-01 18:20 ` Ard Biesheuvel
2017-11-01 19:10 ` Russell King - ARM Linux
2017-11-01 19:10 ` Russell King - ARM Linux
2017-10-30 15:09 ` Arnd Bergmann
2017-10-30 15:09 ` Arnd Bergmann
2017-10-30 15:50 ` Russell King - ARM Linux
2017-10-30 15:50 ` Russell King - ARM Linux
2017-10-30 17:01 ` Arnd Bergmann
2017-10-30 17:01 ` Arnd Bergmann
2017-10-30 17:13 ` Russell King - ARM Linux [this message]
2017-10-30 17:13 ` Russell King - ARM Linux
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