Arne Jansen <sensille <at> gmx.net> writes:

There are some unaligned accesses in progs that cause malfunction or
crashes on ARM.
This patch fixes the ones we stumbled upon.

Signed-off-by: Arne Jansen <sensille <at> gmx.net>
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Change v1->v2:
Somehow sent the wrong patch without the patch to the setget functions.

Hello,

I reported these unaligned accesses originally and tested this patch on an ARMv5
kirkwood device using a 3.6.2 kernel.
I set /proc/cpu/alignment to 5 (signal+warn), and got no signals anymore using
this patch. I tested mkfs.btrfs, sub list and sub find-new (which all signalled
before the patch) and additionally inspect-internal inode-resolve and btrfsck.

None of them signalled or showed any other issues.
tested-by: Andre Diekwisch <andred <at> mail.upb.de>


Thanks a lot Arne, this patch finally renders btrfs-progs usable on an
ARM-machine without enabling unaligned access trapping for userspace.
I'll report back should I run into more issues regarding unaligned accesses.

Hope this patch gets accepted.