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>

diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index 11eb404..b2a4c2d 100644 (file)
--- a/arch/powerpc/include/asm/smp.h
+++ b/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);
 

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index ba50409..3564c49 100644 (file)
--- a/arch/powerpc/kernel/head_64.S
+++ b/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

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index f2c906b..534c503 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/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");
 }
 

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 620d792..1d2fbc9 100644 (file)
--- a/arch/powerpc/kernel/setup_32.c
+++ b/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];

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index a88bf27..0576919 100644 (file)
--- a/arch/powerpc/kernel/setup_64.c
+++ b/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");
 }