2.6.29-rc4 missing __raw_spin_is_contended

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Hi,

I'm trying to compile the 2.6.29-rc4 on sparc64 (V240).
The compilation is breaking here :
  CHK     include/linux/compile.h
  CC [M]  fs/btrfs/locking.o
fs/btrfs/locking.c: In function ‘btrfs_path_lock_waiting’:
fs/btrfs/locking.c:254: error: implicit declaration of function ‘__raw_spin_is_contended’

I had a look at the spinlock_64.h on sparc and did a quick comparison with the x86's one.
The 2 implementation are really different and relies heavily on asm (Maybe it's time I 
learn asm for x86 and sparc...).

	Seb

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