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authorNick Piggin <npiggin@suse.de>2008-01-30 13:31:20 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:20 +0100
commit95c354fe9f7d6decc08a92aa26eb233ecc2155bf (patch)
treeec9267032ea875e84216cfb20acb2cfc7c62149f /arch/m32r
parenta95d67f87e1a5f1b4429be3ba3bf7b4051657908 (diff)
downloadlinux-95c354fe9f7d6decc08a92aa26eb233ecc2155bf.tar.bz2
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/m32r')
-rw-r--r--arch/m32r/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index ab9a264cb194..f7237c5f531e 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -235,6 +235,11 @@ config IRAM_SIZE
# Define implied options from the CPU selection here
#
+config GENERIC_LOCKBREAK
+ bool
+ default y
+ depends on SMP && PREEMPT
+
config RWSEM_GENERIC_SPINLOCK
bool
depends on M32R