[POWERPC] spufs: add memory barriers after set_bit
set_bit does not guarantee ordering on powerpc, so using it
for communication between threads requires explicit
mb() calls.
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 405a055..1582d76 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -76,6 +76,7 @@
* Make sure the exiting bit is cleared.
*/
clear_bit(SPU_SCHED_EXITING, &ctx->sched_flags);
+ mb();
queue_delayed_work(spu_sched_wq, &ctx->sched_work, SPU_TIMESLICE);
}
}
@@ -88,6 +89,7 @@
* makes sure it does not rearm itself anymore.
*/
set_bit(SPU_SCHED_EXITING, &ctx->sched_flags);
+ mb();
cancel_delayed_work(&ctx->sched_work);
}
}
@@ -239,6 +241,7 @@
spin_lock(&spu_prio->runq_lock);
list_add_tail(&ctx->rq, &spu_prio->runq[ctx->prio]);
set_bit(ctx->prio, spu_prio->bitmap);
+ mb();
spin_unlock(&spu_prio->runq_lock);
}