From: David Sterba <dsterba@suse.cz>
Date: Thu, 26 Jan 2012 20:01:12 +0000 (-0500)
Subject: btrfs: fix structs where bitfields and spinlock/atomic share 8B word
X-Git-Tag: v3.3-rc5~9^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c08782dacd7a098f2b8bca7f4a57a5b402e9e1e5;p=pandora-kernel.git

btrfs: fix structs where bitfields and spinlock/atomic share 8B word

On ia64, powerpc64 and sparc64 the bitfield is modified through a RMW cycle and current
gcc rewrites the adjacent 4B word, which in case of a spinlock or atomic has
disaterous effect.

https://lkml.org/lkml/2012/2/1/220

Signed-off-by: David Sterba <dsterba@suse.cz>
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