linux-next: Linus' tree build failure

[Stephen Rothwell]

Hi Chris,

Today's linux-next build (powerpc allyesconfig) failed like this:

fs/btrfs/locking.c: In function 'btrfs_path_lock_waiting':
fs/btrfs/locking.c:254: error: implicit declaration of function '__raw_spin_is_contended'

CONFIG_PREEMPT is not set (since CONFIG_PREEMPT_NONE takes precedence
over it) which means that CONFIG_GENERIC_LOCKBREAK is not set (since it
depends on CONFIG_PREEMPT - at least on powerpc). So spin_is_contended()
is __raw_spin_is_contended().

__raw_spin_is_contended is only defined for UP, MIPS and X86.

Commit b4ce94de9b4d64e8ab3cf155d13653c666e22b9b ("Btrfs: Change btree
locking to use explicit blocking points") from Linus' tree added the
first generic non CONFIG_PREEMPT usage via a call to spin_is_contended().

I got past this for today by building the PowerPC allyesconfig without
btrfs.
-- 
Cheers,
Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx
http://www.canb.auug.org.au/~sfr/

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