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kernel: remove global balancetime variable -> make function static

--- a/sys/src/9/port/proc.c

+++ b/sys/src/9/port/proc.c

@@ -555,11 +555,10 @@

  *  since priorities will otherwise only be recalculated when

  *  the running process blocks.

  */

-ulong balancetime;

-

 static void

 rebalance(void)

 {

+	static ulong lasttime;

 	int pri, npri;

 	Schedq *rq;

 	Proc *p;

@@ -566,9 +565,9 @@

 	ulong t;

 	t = m->ticks;

-	if(t - balancetime < HZ)

+	if(t - lasttime < HZ)

 		return;

-	balancetime = t;

+	lasttime = t;

 	assert(!islo());

-- 

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