+++ /dev/null
-Subject: Explain conditional decrement of aff_sched_count
-From: Andre Detsch <adetsch@br.ibm.com>
-References: 447133 - LTC50070
-
-This patch adds a comment to clarify why atomic_dec_if_positive is being used
-to decrement gang's aff_sched_count on SPU context unbind.
-
-Signed-off-by: Andre Detsch <adetsch@br.ibm.com>
-Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
-Signed-off-by: Olaf Hering <olh@suse.de>
----
- arch/powerpc/platforms/cell/spufs/sched.c | 5 +++++
- 1 file changed, 5 insertions(+)
-
---- a/arch/powerpc/platforms/cell/spufs/sched.c
-+++ b/arch/powerpc/platforms/cell/spufs/sched.c
-@@ -444,6 +444,11 @@ static void spu_unbind_context(struct sp
- atomic_dec(&cbe_spu_info[spu->node].reserved_spus);
-
- if (ctx->gang)
-+ /*
-+ * If ctx->gang->aff_sched_count is positive, SPU affinity is
-+ * being considered in this gang. Using atomic_dec_if_positive
-+ * allow us to skip an explicit check for affinity in this gang
-+ */
- atomic_dec_if_positive(&ctx->gang->aff_sched_count);
-
- spu_switch_notify(spu, NULL);