linux/arch/sparc64
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
..
boot [SPARC64]: Add .gitignore file for sparc64 boot images. 2006-02-05 00:15:11 -08:00
kernel remove __attribute_used__ 2008-01-28 23:21:18 +01:00
lib [SPARC64]: Implement atomic backoff. 2007-10-17 16:24:55 -07:00
math-emu [SPARC64]: small Makefile cleanups 2007-10-22 02:32:10 -07:00
mm [SPARC64]: Fix two kernel linear mapping setup bugs. 2007-12-13 06:13:38 -08:00
oprofile Combine instrumentation menus in kernel/Kconfig.instrumentation 2007-10-19 11:53:54 -07:00
prom [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
solaris [SPARC64]: Partially revert "Constify function pointer tables." 2008-01-23 21:32:04 -08:00
defconfig [SPARC64]: Update defconfig. 2007-12-05 05:38:01 -08:00
Kconfig spinlock: lockbreak cleanup 2008-01-30 13:31:20 +01:00
Kconfig.debug Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION 2007-07-29 16:45:38 -07:00
Makefile [SPARC64]: small Makefile cleanups 2007-10-22 02:32:10 -07:00