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-rw-r--r--spinlock.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/spinlock.c b/spinlock.c
index 9982e67..a0458db 100644
--- a/spinlock.c
+++ b/spinlock.c
@@ -22,8 +22,10 @@ initlock(struct spinlock *lock, char *name)
void
getcallerpcs(void *v, uint pcs[])
{
- uint *ebp = (uint*)v - 2;
+ uint *ebp;
int i;
+
+ ebp = (uint*)v - 2;
for(i = 0; i < 10; i++){
if(ebp == 0 || ebp == (uint*)0xffffffff)
break;
@@ -88,3 +90,4 @@ holding(struct spinlock *lock)
{
return lock->locked && lock->cpu == cpu() + 10;
}
+