runtime: remove unused m->racepc

The original plan was to collect allocation stacks
for all memory blocks. But it was never implemented
and it's not in near plans and it's unclear how to do it at all.

R=golang-dev, dave, bradfitz
CC=golang-dev
https://golang.org/cl/12724044

5 files changed, 6 insertions, 12 deletions

diff --git a/src/pkg/runtime/malloc.goc b/src/pkg/runtime/malloc.goc
index 9ab8e0756d..b146ae2540 100644
--- a/src/pkg/runtime/malloc.goc
+++ b/src/pkg/runtime/malloc.goc
@@ -141,10 +141,8 @@ runtime·mallocgc(uintptr size, uintptr typ, uint32 flag)
 	if(!(flag & FlagNoInvokeGC) && mstats.heap_alloc >= mstats.next_gc)
 		runtime·gc(0);
 
-	if(raceenabled) {
-		runtime·racemalloc(v, size, m->racepc);
-		m->racepc = nil;
-	}
+	if(raceenabled)
+		runtime·racemalloc(v, size);
 	return v;
 }
 
@@ -702,8 +700,6 @@ runtime·mal(uintptr n)
 void
 runtime·new(Type *typ, uint8 *ret)
 {
-	if(raceenabled)
-		m->racepc = runtime·getcallerpc(&typ);
 	ret = runtime·mallocgc(typ->size, (uintptr)typ | TypeInfo_SingleObject, typ->kind&KindNoPointers ? FlagNoPointers : 0);
 	FLUSH(&ret);
 }
diff --git a/src/pkg/runtime/race.c b/src/pkg/runtime/race.c
index 875375da28..0f2a7b986e 100644
--- a/src/pkg/runtime/race.c
+++ b/src/pkg/runtime/race.c
@@ -138,13 +138,13 @@ runtime·racefuncexit(void)
 }
 
 void
-runtime·racemalloc(void *p, uintptr sz, void *pc)
+runtime·racemalloc(void *p, uintptr sz)
 {
 	// use m->curg because runtime·stackalloc() is called from g0
 	if(m->curg == nil)
 		return;
 	m->racecall = true;
-	runtime∕race·Malloc(m->curg->racectx, p, sz, pc);
+	runtime∕race·Malloc(m->curg->racectx, p, sz, /* unused pc */ 0);
 	m->racecall = false;
 }
 
diff --git a/src/pkg/runtime/race.h b/src/pkg/runtime/race.h
index 971783bf0c..f7aa99dc2a 100644
--- a/src/pkg/runtime/race.h
+++ b/src/pkg/runtime/race.h
@@ -16,7 +16,7 @@ uintptr	runtime·raceinit(void);
 void	runtime·racefini(void);
 
 void	runtime·racemapshadow(void *addr, uintptr size);
-void	runtime·racemalloc(void *p, uintptr sz, void *pc);
+void	runtime·racemalloc(void *p, uintptr sz);
 void	runtime·racefree(void *p);
 uintptr	runtime·racegostart(void *pc);
 void	runtime·racegoend(void);
diff --git a/src/pkg/runtime/race0.c b/src/pkg/runtime/race0.c
index 0ebc099838..b74b03583b 100644
--- a/src/pkg/runtime/race0.c
+++ b/src/pkg/runtime/race0.c
@@ -105,11 +105,10 @@ runtime·racefingo(void)
 }
 
 void
-runtime·racemalloc(void *p, uintptr sz, void *pc)
+runtime·racemalloc(void *p, uintptr sz)
 {
 	USED(p);
 	USED(sz);
-	USED(pc);
 }
 
 void
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index a3edb5e955..a81408f40f 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -339,7 +339,6 @@ struct	M
 	GCStats	gcstats;
 	bool	racecall;
 	bool	needextram;
-	void*	racepc;
 	void	(*waitunlockf)(Lock*);
 	void*	waitlock;