Hi, at the risk of overseeing some valid use case, I'm proposing to get rid of the hard rw-spinlocks in both Xenomai and I-pipe. Find attached patches to convert the only user, the IRQ shield, to a spinlock and remove the related wrappings in the HAL and in I-pipe.
Jan
--- include/asm-generic/hal.h | 23 ++++++----------------- ksrc/nucleus/shadow.c | 12 ++++++------ 2 files changed, 12 insertions(+), 23 deletions(-) Index: xenomai/include/asm-generic/hal.h =================================================================== --- xenomai.orig/include/asm-generic/hal.h +++ xenomai/include/asm-generic/hal.h @@ -84,24 +84,18 @@ typedef struct ipipe_domain rthal_pipeline_stage_t; -#ifdef IPIPE_RW_LOCK_UNLOCKED +#ifdef IPIPE_SPIN_LOCK_UNLOCKED typedef ipipe_spinlock_t rthal_spinlock_t; #define RTHAL_SPIN_LOCK_UNLOCKED IPIPE_SPIN_LOCK_UNLOCKED -typedef ipipe_rwlock_t rthal_rwlock_t; -#define RTHAL_RW_LOCK_UNLOCKED IPIPE_RW_LOCK_UNLOCKED -#else /* !IPIPE_RW_LOCK_UNLOCKED */ -#ifdef RAW_RW_LOCK_UNLOCKED +#else /* !IPIPE_SPIN_LOCK_UNLOCKED */ +#ifdef RAW_SPIN_LOCK_UNLOCKED typedef raw_spinlock_t rthal_spinlock_t; #define RTHAL_SPIN_LOCK_UNLOCKED RAW_SPIN_LOCK_UNLOCKED -typedef raw_rwlock_t rthal_rwlock_t; -#define RTHAL_RW_LOCK_UNLOCKED RAW_RW_LOCK_UNLOCKED -#else /* !RAW_RW_LOCK_UNLOCKED */ +#else /* !RAW_SPIN_LOCK_UNLOCKED */ typedef spinlock_t rthal_spinlock_t; #define RTHAL_SPIN_LOCK_UNLOCKED SPIN_LOCK_UNLOCKED -typedef rwlock_t rthal_rwlock_t; -#define RTHAL_RW_LOCK_UNLOCKED RW_LOCK_UNLOCKED -#endif /* RAW_RW_LOCK_UNLOCKED */ -#endif /* IPIPE_RW_LOCK_UNLOCKED */ +#endif /* !RAW_SPIN_LOCK_UNLOCKED */ +#endif /* !IPIPE_SPIN_LOCK_UNLOCKED */ #define rthal_irq_cookie(ipd,irq) __ipipe_irq_cookie(ipd,irq) #define rthal_irq_handler(ipd,irq) __ipipe_irq_handler(ipd,irq) @@ -131,11 +125,6 @@ typedef rwlock_t rthal_rwlock_t; #define rthal_local_irq_disable_hw() local_irq_disable_hw() #define rthal_local_irq_flags_hw(x) local_save_flags_hw(x) -#define rthal_write_lock(lock) write_lock_hw(lock) -#define rthal_write_unlock(lock) write_unlock_hw(lock) -#define rthal_read_lock(lock) read_lock_hw(lock) -#define rthal_read_unlock(lock) read_unlock_hw(lock) - #ifdef spin_lock_hw #define rthal_spin_lock_init(lock) spin_lock_init(lock) #define rthal_spin_lock(lock) spin_lock_hw(lock) Index: xenomai/ksrc/nucleus/shadow.c =================================================================== --- xenomai.orig/ksrc/nucleus/shadow.c +++ xenomai/ksrc/nucleus/shadow.c @@ -295,7 +295,7 @@ static rthal_pipeline_stage_t irq_shield static cpumask_t shielded_cpus, unshielded_cpus; -static rthal_rwlock_t shield_lock = RTHAL_RW_LOCK_UNLOCKED; +static rthal_spinlock_t shield_lock = RTHAL_SPIN_LOCK_UNLOCKED; static inline void engage_irq_shield(void) { @@ -307,13 +307,13 @@ static inline void engage_irq_shield(voi if (xnarch_cpu_test_and_set(cpuid, shielded_cpus)) goto unmask_and_exit; - rthal_read_lock(&shield_lock); + rthal_spin_lock(&shield_lock); xnarch_cpu_clear(cpuid, unshielded_cpus); xnarch_lock_xirqs(&irq_shield, cpuid); - rthal_read_unlock(&shield_lock); + rthal_spin_unlock(&shield_lock); unmask_and_exit: @@ -330,7 +330,7 @@ static void disengage_irq_shield(void) if (xnarch_cpu_test_and_set(cpuid, unshielded_cpus)) goto unmask_and_exit; - rthal_write_lock(&shield_lock); + rthal_spin_lock(&shield_lock); xnarch_cpu_clear(cpuid, shielded_cpus); @@ -339,7 +339,7 @@ static void disengage_irq_shield(void) (i.e. if no CPU asked for shielding). */ if (!cpus_empty(shielded_cpus)) { - rthal_write_unlock(&shield_lock); + rthal_spin_unlock(&shield_lock); goto unmask_and_exit; } @@ -360,7 +360,7 @@ static void disengage_irq_shield(void) } #endif /* CONFIG_SMP */ - rthal_write_unlock(&shield_lock); + rthal_spin_unlock(&shield_lock); rthal_stage_irq_enable(&irq_shield);
--- include/linux/ipipe.h | 43 ------------------------------------------- lib/spinlock_debug.c | 18 ------------------ 2 files changed, 61 deletions(-) Index: linux-2.6.19-ipipe/include/linux/ipipe.h =================================================================== --- linux-2.6.19-ipipe.orig/include/linux/ipipe.h +++ linux-2.6.19-ipipe/include/linux/ipipe.h @@ -229,49 +229,6 @@ do { \ } \ } while(0) -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) -#define write_lock_hw(x) __raw_write_lock(&(x)->raw_lock) -#define write_trylock_hw(x) __raw_write_trylock(&(x)->raw_lock) -#define write_unlock_hw(x) __raw_write_unlock(&(x)->raw_lock) -#define read_lock_hw(x) __raw_read_lock(&(x)->raw_lock) -#define read_trylock_hw(x) __raw_read_trylock(&(x)->raw_lock) -#define read_unlock_hw(x) __raw_read_unlock(&(x)->raw_lock) -#else /* UP non-debug */ -#define write_lock_hw(lock) do { (void)(lock); } while (0) -#define write_trylock_hw(lock) ({ (void)(lock); 1; }) -#define write_unlock_hw(lock) do { (void)(lock); } while (0) -#define read_lock_hw(lock) do { (void)(lock); } while (0) -#define read_trylock_hw(lock) ({ (void)(lock); 1; }) -#define read_unlock_hw(lock) do { (void)(lock); } while (0) -#endif /* CONFIG_SMP || CONFIG_DEBUG_SPINLOCK */ - -typedef rwlock_t ipipe_rwlock_t; -#define IPIPE_RW_LOCK_UNLOCKED RW_LOCK_UNLOCKED - -#define read_lock_irqsave_hw(lock, flags) \ -do { \ - local_irq_save_hw(flags); \ - read_lock_hw(lock); \ -} while (0) - -#define read_unlock_irqrestore_hw(lock, flags) \ -do { \ - read_unlock_hw(lock); \ - local_irq_restore_hw(flags); \ -} while (0) - -#define write_lock_irqsave_hw(lock, flags) \ -do { \ - local_irq_save_hw(flags); \ - write_lock_hw(lock); \ -} while (0) - -#define write_unlock_irqrestore_hw(lock, flags) \ -do { \ - write_unlock_hw(lock); \ - local_irq_restore_hw(flags); \ -} while (0) - DECLARE_PER_CPU(struct ipipe_domain *, ipipe_percpu_domain); extern struct ipipe_domain ipipe_root; Index: linux-2.6.19-ipipe/lib/spinlock_debug.c =================================================================== --- linux-2.6.19-ipipe.orig/lib/spinlock_debug.c +++ linux-2.6.19-ipipe/lib/spinlock_debug.c @@ -129,8 +129,6 @@ void _raw_spin_lock(spinlock_t *lock) debug_spin_lock_after(lock); } -EXPORT_SYMBOL(_raw_spin_lock); - int _raw_spin_trylock(spinlock_t *lock) { int ret = __raw_spin_trylock(&lock->raw_lock); @@ -146,16 +144,12 @@ int _raw_spin_trylock(spinlock_t *lock) return ret; } -EXPORT_SYMBOL(_raw_spin_trylock); - void _raw_spin_unlock(spinlock_t *lock) { debug_spin_unlock(lock); __raw_spin_unlock(&lock->raw_lock); } -EXPORT_SYMBOL(_raw_spin_unlock); - static void rwlock_bug(rwlock_t *lock, const char *msg) { if (!debug_locks_off()) @@ -201,8 +195,6 @@ void _raw_read_lock(rwlock_t *lock) __raw_read_lock(&lock->raw_lock); } -EXPORT_SYMBOL(_raw_read_lock); - int _raw_read_trylock(rwlock_t *lock) { int ret = __raw_read_trylock(&lock->raw_lock); @@ -216,16 +208,12 @@ int _raw_read_trylock(rwlock_t *lock) return ret; } -EXPORT_SYMBOL(_raw_read_trylock); - void _raw_read_unlock(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); __raw_read_unlock(&lock->raw_lock); } -EXPORT_SYMBOL(_raw_read_unlock); - static inline void debug_write_lock_before(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); @@ -283,8 +271,6 @@ void _raw_write_lock(rwlock_t *lock) debug_write_lock_after(lock); } -EXPORT_SYMBOL(_raw_write_lock); - int _raw_write_trylock(rwlock_t *lock) { int ret = __raw_write_trylock(&lock->raw_lock); @@ -300,12 +286,8 @@ int _raw_write_trylock(rwlock_t *lock) return ret; } -EXPORT_SYMBOL(_raw_write_trylock); - void _raw_write_unlock(rwlock_t *lock) { debug_write_unlock(lock); __raw_write_unlock(&lock->raw_lock); } - -EXPORT_SYMBOL(_raw_write_unlock);
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