coroutine: move entry argument to qemu_coroutine_create

In practice the entry argument is always known at creation time, and
it is confusing that sometimes qemu_coroutine_enter is used with a
non-NULL argument to re-enter a coroutine (this happens in
block/sheepdog.c and tests/test-coroutine.c).  So pass the opaque value
at creation time, for consistency with e.g. aio_bh_new.

Mostly done with the following semantic patch:

@ entry1 @
expression entry, arg, co;
@@
- co = qemu_coroutine_create(entry);
+ co = qemu_coroutine_create(entry, arg);
  ...
- qemu_coroutine_enter(co, arg);
+ qemu_coroutine_enter(co);

@ entry2 @
expression entry, arg;
identifier co;
@@
- Coroutine *co = qemu_coroutine_create(entry);
+ Coroutine *co = qemu_coroutine_create(entry, arg);
  ...
- qemu_coroutine_enter(co, arg);
+ qemu_coroutine_enter(co);

@ entry3 @
expression entry, arg;
@@
- qemu_coroutine_enter(qemu_coroutine_create(entry), arg);
+ qemu_coroutine_enter(qemu_coroutine_create(entry, arg));

@ reentry @
expression co;
@@
- qemu_coroutine_enter(co, NULL);
+ qemu_coroutine_enter(co);

except for the aforementioned few places where the semantic patch
stumbled (as expected) and for test_co_queue, which would otherwise
produce an uninitialized variable warning.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/block/mirror.c b/block/mirror.c
index 705fbc0..71e5ad4 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -121,7 +121,7 @@ static void mirror_iteration_done(MirrorOp *op, int ret)
     g_free(op);
 
     if (s->waiting_for_io) {
-        qemu_coroutine_enter(s->common.co, NULL);
+        qemu_coroutine_enter(s->common.co);
     }
 }
 
@@ -901,9 +901,9 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
 
     bdrv_op_block_all(target, s->common.blocker);
 
-    s->common.co = qemu_coroutine_create(mirror_run);
+    s->common.co = qemu_coroutine_create(mirror_run, s);
     trace_mirror_start(bs, s, s->common.co, opaque);
-    qemu_coroutine_enter(s->common.co, s);
+    qemu_coroutine_enter(s->common.co);
 }
 
 void mirror_start(const char *job_id, BlockDriverState *bs,