I was compiling a kernel in a shell that I set to a priority of 20,
and it locked up on the bit_spin_lock crap of jbd.

This patch adds another spinlock to the buffer head and uses that
instead of the bit_spins.

From: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

--

 fs/buffer.c                 |    3 ++-
 include/linux/buffer_head.h |    1 +
 include/linux/jbd.h         |   12 ++++++------
 3 files changed, 9 insertions(+), 7 deletions(-)