Remove pc_name member of struct pcpu.

pc_name is only included when KTR option is and it does introduce a
subdle KBI breakage that totally breaks vmstat when world and kernel are
not in sync.
Besides, it is not used somewhere.

In collabouration with:	pluknet
Reviewed by:	jhb
Approved by:	re (kib)

sys/kern/subr_pcpu.c

@@ -92,9 +92,6 @@ pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
 	cpu_pcpu_init(pcpu, cpuid, size);
 	pcpu->pc_rm_queue.rmq_next = &pcpu->pc_rm_queue;
 	pcpu->pc_rm_queue.rmq_prev = &pcpu->pc_rm_queue;
-#ifdef KTR
-	snprintf(pcpu->pc_name, sizeof(pcpu->pc_name), "CPU %d", cpuid);
-#endif
 }
 
 void

sys/sys/pcpu.h

@@ -165,9 +165,6 @@ struct pcpu {
 	u_int		pc_cpuid;		/* This cpu number */
 	STAILQ_ENTRY(pcpu) pc_allcpu;
 	struct lock_list_entry *pc_spinlocks;
-#ifdef KTR
-	char		pc_name[PCPU_NAME_LEN];	/* String name for KTR */
-#endif
 	struct vmmeter	pc_cnt;			/* VM stats counters */
 	long		pc_cp_time[CPUSTATES];	/* statclock ticks */
 	struct device	*pc_device;