[POWERPC] spu sched: simplity spu_remove_from_active_list

If we call spu_remove_from_active_list that spu is always guaranteed
to be on the active list and in runnable state, so we can simply
do a list_del to remove it and unconditionally take the was_active
codepath.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 15 insertions, 29 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 07d0d095c62a..40202a752a7a 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -83,27 +83,14 @@ static void spu_add_to_active_list(struct spu *spu)
 /**
  * spu_remove_from_active_list - remove spu from active list
  * @spu:       spu to remove from the active list
- *
- * This function removes an spu from the active list.  If the spu was
- * found on the active list the function returns 1, else it doesn't do
- * anything and returns 0.
  */
-static int spu_remove_from_active_list(struct spu *spu)
+static void spu_remove_from_active_list(struct spu *spu)
 {
         int node = spu->node;
-        struct spu *tmp;
-        int rc = 0;
 
         mutex_lock(&spu_prio->active_mutex[node]);
-        list_for_each_entry(tmp, &spu_prio->active_list[node], list) {
-                if (tmp == spu) {
-                        list_del_init(&spu->list);
-                        rc = 1;
-                        break;
-                }
-        }
+        list_del_init(&spu->list);
         mutex_unlock(&spu_prio->active_mutex[node]);
-        return rc;
 }
 
 static inline void mm_needs_global_tlbie(struct mm_struct *mm)
@@ -167,16 +154,13 @@ static void spu_bind_context(struct spu *spu, struct spu_context *ctx)
  * spu_unbind_context - unbind spu context from physical spu
  * @spu:        physical spu to unbind from
  * @ctx:        context to unbind
- *
- * If the spu was on the active list the function returns 1, else 0.
  */
-static int spu_unbind_context(struct spu *spu, struct spu_context *ctx)
+static void spu_unbind_context(struct spu *spu, struct spu_context *ctx)
 {
-        int was_active = spu_remove_from_active_list(spu);
-
         pr_debug("%s: unbind pid=%d SPU=%d NODE=%d\n", __FUNCTION__,
                  spu->pid, spu->number, spu->node);
 
+        spu_remove_from_active_list(spu);
         spu_switch_notify(spu, NULL);
         spu_unmap_mappings(ctx);
         spu_save(&ctx->csa, spu);
@@ -193,8 +177,6 @@ static int spu_unbind_context(struct spu *spu, struct spu_context *ctx)
         ctx->spu = NULL;
         spu->flags = 0;
         spu->ctx = NULL;
-
-        return was_active;
 }
 
 /**
@@ -340,17 +322,21 @@ int spu_activate(struct spu_context *ctx, unsigned long flags)
         return -ERESTARTSYS;
 }
 
+/**
+ * spu_deactivate - unbind a context from it's physical spu
+ * @ctx:        spu context to unbind
+ *
+ * Unbind @ctx from the physical spu it is running on and schedule
+ * the highest priority context to run on the freed physical spu.
+ */
 void spu_deactivate(struct spu_context *ctx)
 {
-        struct spu *spu;
-        int was_active;
+        struct spu *spu = ctx->spu;
 
-        spu = ctx->spu;
-        if (!spu)
-                return;
-        was_active = spu_unbind_context(spu, ctx);
-        if (was_active)
+        if (spu) {
+                spu_unbind_context(spu, ctx);
                 spu_reschedule(spu);
+        }
 }
 
 void spu_yield(struct spu_context *ctx)