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| author |   Nick Piggin <npiggin@suse.de> | 2008-01-30 13:31:20 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:31:20 +0100 |
| commit | 95c354fe9f7d6decc08a92aa26eb233ecc2155bf (patch) | |
| tree | ec9267032ea875e84216cfb20acb2cfc7c62149f /arch/ia64/Kconfig | |
| parent | x86, ptrace: new ptrace BTS API (diff) | |
| download | linux-dev-95c354fe9f7d6decc08a92aa26eb233ecc2155bf.tar.xz linux-dev-95c354fe9f7d6decc08a92aa26eb233ecc2155bf.zip | |
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/ia64/Kconfig')
| -rw-r--r-- | arch/ia64/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index bef47725d4ad..4a81b7fb191a 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -42,6 +42,11 @@ config MMU config SWIOTLB bool +config GENERIC_LOCKBREAK + bool + default y + depends on SMP && PREEMPT + config RWSEM_XCHGADD_ALGORITHM bool default y |