Commit 94c95cfb authored Jan 24, 2013 by Li Zhong Committed by Benjamin Herrenschmidt Jan 29, 2013

powerpc: Avoid debug_smp_processor_id() check in SHARED_PROCESSOR



Use local_paca directly in macro SHARED_PROCESSOR, as all processors
have the same value for the field shared_proc, so we don't need care
racy here.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent 5e249d45

arch/powerpc/include/asm/spinlock.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -96,7 +96,7 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)

		#if defined(CONFIG_PPC_SPLPAR)
		/* We only yield to the hypervisor if we are in shared processor mode */
		#define SHARED_PROCESSOR (get_lppaca()->shared_proc)
		#define SHARED_PROCESSOR (local_paca->lppaca_ptr->shared_proc)
		extern void __spin_yield(arch_spinlock_t *lock);
		extern void __rw_yield(arch_rwlock_t *lock);
		#else /* SPLPAR */