linux/arch/parisc
Nick Piggin 95c354fe9f spinlock: lockbreak cleanup
The break_lock data structure and code for spinlocks is quite nasty.
Not only does it double the size of a spinlock but it changes locking to
a potentially less optimal trylock.

Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a
__raw_spin_is_contended that uses the lock data itself to determine whether
there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is
not set.

Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to
decouple it from the spinlock implementation, and make it typesafe (rwlocks
do not have any need_lockbreak sites -- why do they even get bloated up
with that break_lock then?).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:31:20 +01:00
..
configs [PARISC] Update defconfigs 2007-10-18 00:58:37 -07:00
hpux [PARISC] Remove hardcoded uses of PAGE_SIZE 2007-10-18 00:59:27 -07:00
kernel all archs: consolidate init and exit sections in vmlinux.lds.h 2008-01-28 23:21:17 +01:00
lib Revert "[PARISC] import necessary bits of libgcc.a" 2007-12-06 09:16:29 -08:00
math-emu kbuild: fix up CFLAGS usage 2007-10-14 21:49:42 +02:00
mm Merge branch 'master' of hera.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6 2007-10-20 20:19:15 -07:00
oprofile Combine instrumentation menus in kernel/Kconfig.instrumentation 2007-10-19 11:53:54 -07:00
Kconfig spinlock: lockbreak cleanup 2008-01-30 13:31:20 +01:00
Kconfig.debug [PARISC] Add CONFIG_DEBUG_RODATA to protect read-only data 2006-01-22 20:26:54 -05:00
Makefile Revert "[PARISC] import necessary bits of libgcc.a" 2007-12-06 09:16:29 -08:00
defconfig [PARISC] Update defconfigs 2007-10-18 00:58:37 -07:00
defpalo.conf Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
install.sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00