[IA64] Kernel parameter for max number of concurrent global TLB purges

The patch defines kernel parameter "nptcg=". The parameter overrides max number
of concurrent global TLB purges which is reported from either PAL_VM_SUMMARY or
SAL PALO.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/efi.c

@@ -436,7 +436,7 @@ static void __init handle_palo(unsigned long palo_phys)
 		return;
 	}
 
-	setup_ptcg_sem(palo->max_tlb_purges, 1);
+	setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 }
 
 void

arch/ia64/kernel/setup.c

@@ -949,7 +949,7 @@ cpu_init (void)
 	/* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
 	if (ia64_pal_vm_summary(NULL, &vmi) == 0) {
 		max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
-		setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, 0);
+		setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, NPTCG_FROM_PAL);
 	} else {
 		printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");
 		max_ctx = (1U << 15) - 1;	/* use architected minimum */