From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon, 22 Sep 2014 12:45:11 +0000 (+0200)
Subject: s390/rwlock: remove interrupt-enabling rwlock variant.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2684e73a861fe7b2ab763f442207025a1d9bb6a6;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

s390/rwlock: remove interrupt-enabling rwlock variant.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h
index e98654163e5c..f9537b91ff21 100644
--- a/arch/s390/include/asm/spinlock.h
+++ b/arch/s390/include/asm/spinlock.h
@@ -131,12 +131,13 @@ static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
 #define arch_write_can_lock(x) ((x)->lock == 0)
 
 extern void _raw_read_lock_wait(arch_rwlock_t *lp);
-extern void _raw_read_lock_wait_flags(arch_rwlock_t *lp, unsigned long flags);
-extern int _raw_read_trylock_retry(arch_rwlock_t *lp);
 extern void _raw_write_lock_wait(arch_rwlock_t *lp);
-extern void _raw_write_lock_wait_flags(arch_rwlock_t *lp, unsigned long flags);
+extern int _raw_read_trylock_retry(arch_rwlock_t *lp);
 extern int _raw_write_trylock_retry(arch_rwlock_t *lp);
 
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
 static inline int arch_read_trylock_once(arch_rwlock_t *rw)
 {
 	unsigned int old = ACCESS_ONCE(rw->lock);
@@ -157,12 +158,6 @@ static inline void arch_read_lock(arch_rwlock_t *rw)
 		_raw_read_lock_wait(rw);
 }
 
-static inline void arch_read_lock_flags(arch_rwlock_t *rw, unsigned long flags)
-{
-	if (!arch_read_trylock_once(rw))
-		_raw_read_lock_wait_flags(rw, flags);
-}
-
 static inline void arch_read_unlock(arch_rwlock_t *rw)
 {
 	unsigned int old;
@@ -179,13 +174,6 @@ static inline void arch_write_lock(arch_rwlock_t *rw)
 	rw->owner = SPINLOCK_LOCKVAL;
 }
 
-static inline void arch_write_lock_flags(arch_rwlock_t *rw, unsigned long flags)
-{
-	if (!arch_write_trylock_once(rw))
-		_raw_write_lock_wait_flags(rw, flags);
-	rw->owner = SPINLOCK_LOCKVAL;
-}
-
 static inline void arch_write_unlock(arch_rwlock_t *rw)
 {
 	typecheck(unsigned int, rw->lock);
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index 5f63ac5783cb..c717f4a4c63e 100644
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -131,31 +131,6 @@ void _raw_read_lock_wait(arch_rwlock_t *rw)
 }
 EXPORT_SYMBOL(_raw_read_lock_wait);
 
-void _raw_read_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
-{
-	unsigned int owner, old;
-	int count = spin_retry;
-
-	local_irq_restore(flags);
-	owner = 0;
-	while (1) {
-		if (count-- <= 0) {
-			if (owner && !smp_vcpu_scheduled(~owner))
-				smp_yield_cpu(~owner);
-			count = spin_retry;
-		}
-		old = ACCESS_ONCE(rw->lock);
-		owner = ACCESS_ONCE(rw->owner);
-		if ((int) old < 0)
-			continue;
-		local_irq_disable();
-		if (_raw_compare_and_swap(&rw->lock, old, old + 1))
-			return;
-		local_irq_restore(flags);
-	}
-}
-EXPORT_SYMBOL(_raw_read_lock_wait_flags);
-
 int _raw_read_trylock_retry(arch_rwlock_t *rw)
 {
 	unsigned int old;
@@ -194,31 +169,6 @@ void _raw_write_lock_wait(arch_rwlock_t *rw)
 }
 EXPORT_SYMBOL(_raw_write_lock_wait);
 
-void _raw_write_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
-{
-	unsigned int owner, old;
-	int count = spin_retry;
-
-	local_irq_restore(flags);
-	owner = 0;
-	while (1) {
-		if (count-- <= 0) {
-			if (owner && !smp_vcpu_scheduled(~owner))
-				smp_yield_cpu(~owner);
-			count = spin_retry;
-		}
-		old = ACCESS_ONCE(rw->lock);
-		owner = ACCESS_ONCE(rw->owner);
-		if (old)
-			continue;
-		local_irq_disable();
-		if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000))
-			return;
-		local_irq_restore(flags);
-	}
-}
-EXPORT_SYMBOL(_raw_write_lock_wait_flags);
-
 int _raw_write_trylock_retry(arch_rwlock_t *rw)
 {
 	unsigned int old;