powerpc: Fix early boot accounting of CPUs

smp_release_cpus() waits for all cpus (including the bootcpu) due to an
off-by-one count on boot_cpu_count (which is all CPUs).  This patch replaces
that with spinning_secondaries (which is all secondary CPUs).

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/smp.h

@@ -30,7 +30,7 @@
 #include <asm/percpu.h>
 
 extern int boot_cpuid;
-extern int boot_cpu_count;
+extern int spinning_secondaries;
 
 extern void cpu_die(void);
 

arch/powerpc/kernel/head_64.S

@@ -255,7 +255,7 @@ generic_secondary_common_init:
 	mtctr	r23
 	bctrl
 
-3:	LOAD_REG_ADDR(r3, boot_cpu_count) /* Decrement boot_cpu_count */
+3:	LOAD_REG_ADDR(r3, spinning_secondaries) /* Decrement spinning_secondaries */
 	lwarx	r4,0,r3
 	subi	r4,r4,1
 	stwcx.	r4,0,r3

arch/powerpc/kernel/prom.c

@@ -69,6 +69,7 @@ unsigned long tce_alloc_start, tce_alloc_end;
 u64 ppc64_rma_size;
 #endif
 static phys_addr_t first_memblock_size;
+static int __initdata boot_cpu_count;
 
 static int __init early_parse_mem(char *p)
 {
@@ -748,6 +749,13 @@ void __init early_init_devtree(void *params)
 	 */
 	of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 
+#if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
+	/* We'll later wait for secondaries to check in; there are
+	 * NCPUS-1 non-boot CPUs  :-)
+	 */
+	spinning_secondaries = boot_cpu_count - 1;
+#endif
+
 	DBG(" <- early_init_devtree()\n");
 }
 

arch/powerpc/kernel/setup_32.c

@@ -48,7 +48,6 @@ extern void bootx_init(unsigned long r4, unsigned long phys);
 
 int boot_cpuid = -1;
 EXPORT_SYMBOL_GPL(boot_cpuid);
-int __initdata boot_cpu_count;
 int boot_cpuid_phys;
 
 int smp_hw_index[NR_CPUS];

arch/powerpc/kernel/setup_64.c

@@ -73,7 +73,7 @@
 #endif
 
 int boot_cpuid = 0;
-int __initdata boot_cpu_count;
+int __initdata spinning_secondaries;
 u64 ppc64_pft_size;
 
 /* Pick defaults since we might want to patch instructions
@@ -253,11 +253,11 @@ void smp_release_cpus(void)
 	for (i = 0; i < 100000; i++) {
 		mb();
 		HMT_low();
-		if (boot_cpu_count == 0)
+		if (spinning_secondaries == 0)
 			break;
 		udelay(1);
 	}
-	DBG("boot_cpu_count = %d\n", boot_cpu_count);
+	DBG("spinning_secondaries = %d\n", spinning_secondaries);
 
 	DBG(" <- smp_release_cpus()\n");
 }