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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-06-12 10:26:22 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-12 10:27:29 +0200
commitce58ae6f7f6bdd48c87472ff830a6d586ff076b2 (patch)
tree20d9139566563a3fa8ca012e6444a0e6262bb9e2 /arch/s390/lib
parent76d4e00a05d06c1d1552adea24fcf6182c9d8999 (diff)
downloadlinux-linaro-android-ce58ae6f7f6bdd48c87472ff830a6d586ff076b2.tar.gz
[S390] implement interrupt-enabling rwlocks
arch backend for f5f7eac41db827a47b2163330eecd7bb55ae9f12 "Allow rwlocks to re-enable interrupts". Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r--arch/s390/lib/spinlock.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index e41f4008afc..f7e0d30250b 100644
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -124,6 +124,27 @@ void _raw_read_lock_wait(raw_rwlock_t *rw)
}
EXPORT_SYMBOL(_raw_read_lock_wait);
+void _raw_read_lock_wait_flags(raw_rwlock_t *rw, unsigned long flags)
+{
+ unsigned int old;
+ int count = spin_retry;
+
+ local_irq_restore(flags);
+ while (1) {
+ if (count-- <= 0) {
+ _raw_yield();
+ count = spin_retry;
+ }
+ if (!__raw_read_can_lock(rw))
+ continue;
+ old = rw->lock & 0x7fffffffU;
+ local_irq_disable();
+ if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
+ return;
+ }
+}
+EXPORT_SYMBOL(_raw_read_lock_wait_flags);
+
int _raw_read_trylock_retry(raw_rwlock_t *rw)
{
unsigned int old;
@@ -157,6 +178,25 @@ void _raw_write_lock_wait(raw_rwlock_t *rw)
}
EXPORT_SYMBOL(_raw_write_lock_wait);
+void _raw_write_lock_wait_flags(raw_rwlock_t *rw, unsigned long flags)
+{
+ int count = spin_retry;
+
+ local_irq_restore(flags);
+ while (1) {
+ if (count-- <= 0) {
+ _raw_yield();
+ count = spin_retry;
+ }
+ if (!__raw_write_can_lock(rw))
+ continue;
+ local_irq_disable();
+ if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
+ return;
+ }
+}
+EXPORT_SYMBOL(_raw_write_lock_wait_flags);
+
int _raw_write_trylock_retry(raw_rwlock_t *rw)
{
int count = spin_retry;