From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Tue, 25 Jan 2011 13:57:26 -0000 Subject: [PATCH 02/14] ARM: bitops: switch set/clear/change bitops to use ldrex/strex In-Reply-To: <20110123001636.GA20841@n2100.arm.linux.org.uk> References: <20110117192050.GE23331@n2100.arm.linux.org.uk> <20110123001636.GA20841@n2100.arm.linux.org.uk> Message-ID: <000601cbbc97$cc6955d0$653c0170$@deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Russell, Hopefully this isn't too late to be useful. > On Mon, Jan 17, 2011 at 07:21:40PM +0000, Russell King - ARM Linux wrote: > > Switch the set/clear/change bitops to use the word-based exclusive > > operations, which are only present in a wider range of ARM architectures > > than the byte-based exclusive operations. > > > > Signed-off-by: Russell King > > As only one person replied to this patch with test information, I'm > not happy to push this into -rc, and hence that prevents it going into > -stable too. That means omap2plus_defconfig .38 mainline kernels > (including -stable) will remain potentially dangerous when run on > SMP capable hardware. > > Therefore, I see no alternative at the moment but to purposely cause > builds which cover ARMv6, and ARMv6K or ARMv7 CPUs to save people from > data corruption. > > Please get your tested-by's to me for at least the first three patches > of this series ASAP. I've tested this on the Versatile Express (ca9x4, little endian) with a USB hard drive and ext3 (rw) filesystem. I did a bunch of parallel dds of a 2GB file containing random data whilst the system was fairly loaded. File checksums all passed and the kernel didn't do anything untowards. Tested-by: Will Deacon I appreciate this is the same test configuration as the one Nicolas did, but it at least replicates his findings. Will