diff options
| author | Christopher M. Riedl <cmr@informatik.wtf> | 2019-08-12 22:13:12 -0500 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-27 13:03:36 +1000 |
| commit | d57b78353a99f5d813248954dd7d0527a01751ac (patch) | |
| tree | 70177d1eaa526076ac2e87bac05a5e01772869e5 /arch/powerpc/include | |
| parent | d7fb5b18a540efaf05da2b980fc11d50ba775677 (diff) | |
| download | linux-d57b78353a99f5d813248954dd7d0527a01751ac.tar.bz2 | |
powerpc/spinlocks: Refactor SHARED_PROCESSOR
Determining if a processor is in shared processor mode is not a constant
so don't hide it behind a #define.
Signed-off-by: Christopher M. Riedl <cmr@informatik.wtf>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190813031314.1828-2-cmr@informatik.wtf
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/spinlock.h | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h index a47f827bc5f1..e9c60fbcc8fe 100644 --- a/arch/powerpc/include/asm/spinlock.h +++ b/arch/powerpc/include/asm/spinlock.h @@ -101,15 +101,27 @@ 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 (lppaca_shared_proc(local_paca->lppaca_ptr)) extern void __spin_yield(arch_spinlock_t *lock); extern void __rw_yield(arch_rwlock_t *lock); #else /* SPLPAR */ #define __spin_yield(x) barrier() #define __rw_yield(x) barrier() -#define SHARED_PROCESSOR 0 #endif +static inline bool is_shared_processor(void) +{ +/* + * LPPACA is only available on Pseries so guard anything LPPACA related to + * allow other platforms (which include this common header) to compile. + */ +#ifdef CONFIG_PPC_PSERIES + return (IS_ENABLED(CONFIG_PPC_SPLPAR) && + lppaca_shared_proc(local_paca->lppaca_ptr)); +#else + return false; +#endif +} + static inline void arch_spin_lock(arch_spinlock_t *lock) { while (1) { @@ -117,7 +129,7 @@ static inline void arch_spin_lock(arch_spinlock_t *lock) break; do { HMT_low(); - if (SHARED_PROCESSOR) + if (is_shared_processor()) __spin_yield(lock); } while (unlikely(lock->slock != 0)); HMT_medium(); @@ -136,7 +148,7 @@ void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) local_irq_restore(flags); do { HMT_low(); - if (SHARED_PROCESSOR) + if (is_shared_processor()) __spin_yield(lock); } while (unlikely(lock->slock != 0)); HMT_medium(); @@ -226,7 +238,7 @@ static inline void arch_read_lock(arch_rwlock_t *rw) break; do { HMT_low(); - if (SHARED_PROCESSOR) + if (is_shared_processor()) __rw_yield(rw); } while (unlikely(rw->lock < 0)); HMT_medium(); @@ -240,7 +252,7 @@ static inline void arch_write_lock(arch_rwlock_t *rw) break; do { HMT_low(); - if (SHARED_PROCESSOR) + if (is_shared_processor()) __rw_yield(rw); } while (unlikely(rw->lock != 0)); HMT_medium(); |