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/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index ba50409..3564c49 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -255,7 +255,7 @@
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
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -69,6 +69,7 @@
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 @@
*/
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
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -48,7 +48,6 @@
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
--- 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 @@
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");
}