lockstat build fix

c020c6f1 · Nickolai Zeldovich · d164ddab · c020c6f1 · c020c6f1 · c020c6f1
--- a/kalloc.c
+++ b/kalloc.c
@@ -305,10 +305,12 @@ verifyfree(char *ptr, u64 nbytes)
    // Search for pointers in the ptr region
    u64 x = *(uptr *)p;
    if (KBASE < x && x < KBASE+(128ull<<30)) {
+#if 0   /* maybe once this code is C++ */
      struct klockstat *kls = (struct klockstat *) x;
      if (kls->magic == LOCKSTAT_MAGIC)
        panic("LOCKSTAT_MAGIC %p(%lu):%p->%p", 
              ptr, nbytes, p, kls);
+#endif
    }
  }
 #endif

--- a/lockstat.h
+++ b/lockstat.h
@@ -2,6 +2,9 @@
 #define LOCKSTAT_MAGIC 0xb4cd79c1b2e46f40ull
+#if __cplusplus
+#include "gc.hh"
 struct cpulockstat {
  u64 acquires;
  u64 contends;
@@ -18,11 +21,17 @@ struct lockstat {
  struct cpulockstat cpu[NCPU] __mpalign__;
 };
-struct klockstat {
+struct klockstat : public rcu_freed {
  u64 magic;
  LIST_ENTRY(klockstat) link;
  struct lockstat s;
+  klockstat() : rcu_freed("klockstat") {}
+  virtual ~klockstat() {}
 };
+#else
+struct klockstat;
+#endif
 #define LOCKSTAT_START     1
 #define LOCKSTAT_STOP      2

--- a/spinlock.cc
+++ b/spinlock.cc
@@ -114,7 +114,7 @@ static struct spinlock lockstat_lock = {
 void
 lockstat_init(struct spinlock *lk)
 {
-  lk->stat = (struct klockstat*) kmalloc(sizeof(*lk->stat));
+  lk->stat = new klockstat();
  if (lk->stat == NULL)
    return;
@@ -145,8 +145,8 @@ lockstat_clear(void)
    if (stat->magic == 0) {
      LIST_REMOVE(stat, link);
      // So verifyfree doesn't follow le_next
-      stat->link.le_next = (struct klockstat*) NULL;
+      stat->link.le_next = 0;
-      gc_delayed(stat, kmfree);
+      gc_delayed(stat);
    } else {
      memset(&stat->s.cpu, 0, sizeof(stat->s.cpu));
    }