aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc64
diff options
context:
space:
mode:
authorNick Piggin <npiggin@suse.de>2008-01-30 07:31:20 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:31:20 -0500
commit95c354fe9f7d6decc08a92aa26eb233ecc2155bf (patch)
treeec9267032ea875e84216cfb20acb2cfc7c62149f /arch/sparc64
parenta95d67f87e1a5f1b4429be3ba3bf7b4051657908 (diff)
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>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 10b212a1f9f5..1e25bce0366d 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -200,6 +200,11 @@ config US2E_FREQ
200 If in doubt, say N. 200 If in doubt, say N.
201 201
202# Global things across all Sun machines. 202# Global things across all Sun machines.
203config GENERIC_LOCKBREAK
204 bool
205 default y
206 depends on SMP && PREEMPT
207
203config RWSEM_GENERIC_SPINLOCK 208config RWSEM_GENERIC_SPINLOCK
204 bool 209 bool
205 210