runtime: clean up naming of mcallable functions.
Introduce the mFunction type to represent an mcall/onM-able function.
Name such functions using _m.
LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/121320043
diff --git a/src/pkg/runtime/stubs.go b/src/pkg/runtime/stubs.go
index 30638d1..8a2fc8a9 100644
--- a/src/pkg/runtime/stubs.go
+++ b/src/pkg/runtime/stubs.go
@@ -44,21 +44,29 @@
func acquirem() *m
func releasem(mp *m)
-// in asm_*.s
-func mcall(fn *byte)
-func onM(fn *byte)
+// An mFunction represents a C function that runs on the M stack. It
+// can be called from Go using mcall or onM. Through the magic of
+// linking, an mFunction variable and the corresponding C code entry
+// point live at the same address.
+type mFunction byte
-// C routines that run on the M stack. Call these like
-// mcall(&mcacheRefill)
+// in asm_*.s
+func mcall(fn *mFunction)
+func onM(fn *mFunction)
+
+// C functions that run on the M stack. Call these like
+// mcall(&mcacheRefill_m)
// Arguments should be passed in m->scalararg[x] and
// m->ptrarg[x]. Return values can be passed in those
// same slots.
-var mcacheRefill byte
-var largeAlloc byte
-var mprofMalloc byte
-var mgc2 byte
-var setFinalizer byte
-var markallocated_m byte
+var (
+ mcacheRefill_m,
+ largeAlloc_m,
+ mprofMalloc_m,
+ gc_m,
+ setFinalizer_m,
+ markallocated_m mFunction
+)
// memclr clears n bytes starting at ptr.
// in memclr_*.s
