coroutine: Clean up qemu_coroutine_enter()

qemu_coroutine_enter() is now the only user of coroutine_swap(). Both
functions are short, so inline it.

Also, using COROUTINE_YIELD is now even more confusing because this code
is never called during qemu_coroutine_yield() any more. In fact, this
value is never read back, so we can just introduce a new COROUTINE_ENTER
which documents the purpose of the task switch better.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/include/block/coroutine_int.h b/include/block/coroutine_int.h
index f133d65..9aa1aae 100644
--- a/include/block/coroutine_int.h
+++ b/include/block/coroutine_int.h
@@ -31,6 +31,7 @@
 typedef enum {
     COROUTINE_YIELD = 1,
     COROUTINE_TERMINATE = 2,
+    COROUTINE_ENTER = 3,
 } CoroutineAction;
 
 struct Coroutine {