From c08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Thu, 26 Jan 2012 15:01:12 -0500
Subject: [PATCH] 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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