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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2006-01-06 00:19:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:48 -0800
commit973bd9937569146de0917f54f05b2942f8257912 (patch)
tree86dd796de5bf456eca904b350c9515f4795122bb /drivers/s390/char
parent8d93c700a489eba08514222df414a23852a85d2b (diff)
[PATCH] s390: atomic primitives
Hugh Dickins <hugh@veritas.com> Fix the broken atomic_cmpxchg primitive. Add atomic_sub_and_test, atomic64_sub_return, atomic64_sub_and_test, atomic64_cmpxchg, atomic64_add_unless and atomic64_inc_not_zero. Replace old style atomic_compare_and_swap by atomic_cmpxchg. Shorten the whole header by defining most primitives with the two inline functions atomic_add_return and atomic_sub_return. In addition this patch contains the s390 related fixes of Hugh's "mm: fill arch atomic64 gaps" patch. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/sclp_quiesce.c2
-rw-r--r--drivers/s390/char/tape_block.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
index 83f75774df6..56fa6916889 100644
--- a/drivers/s390/char/sclp_quiesce.c
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -32,7 +32,7 @@ do_load_quiesce_psw(void * __unused)
psw_t quiesce_psw;
int cpu;
- if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
+ if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */
for_each_online_cpu(cpu) {
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 1efc9f21229..482e07e388c 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -65,7 +65,7 @@ static void
tapeblock_trigger_requeue(struct tape_device *device)
{
/* Protect against rescheduling. */
- if (atomic_compare_and_swap(0, 1, &device->blk_data.requeue_scheduled))
+ if (atomic_cmpxchg(&device->blk_data.requeue_scheduled, 0, 1) != 0)
return;
schedule_work(&device->blk_data.requeue_task);
}