On Tue, Jan 25, 2011 at 01:57:26PM -0000, Will Deacon wrote:

Hi Russell,

Hopefully this isn't too late to be useful.

quoted

On Mon, Jan 17, 2011 at 07:21:40PM +0000, Russell King - ARM Linux wrote:

quoted

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 <redacted>

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 <redacted>

I appreciate this is the same test configuration as the one Nicolas did,
but it at least replicates his findings.

Was this for just the first three or the complete set?

Thanks.