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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-03-16 14:54:35 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-20 11:03:24 +1000
commit9d07bc841c9779b4d7902e417f4e509996ce805d (patch)
tree7a381096d3da7497aac58c4ec18c74299ee47fb4 /arch/powerpc/kernel/prom.c
parentad0693ee722b93b63a89c845e99513f242e43aa6 (diff)
downloadlinux-9d07bc841c9779b4d7902e417f4e509996ce805d.tar.bz2
powerpc: Properly handshake CPUs going out of boot spin loop
We need to wait a bit for them to have done their CPU setup or we might end up with translation and EE on with different LPCR values between threads Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
-rw-r--r--arch/powerpc/kernel/prom.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index e74fa12afc82..c391dc4c8bad 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -268,13 +268,12 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
const char *uname, int depth,
void *data)
{
- static int logical_cpuid = 0;
char *type = of_get_flat_dt_prop(node, "device_type", NULL);
const u32 *prop;
const u32 *intserv;
int i, nthreads;
unsigned long len;
- int found = 0;
+ int found = -1;
/* We are scanning "cpu" nodes only */
if (type == NULL || strcmp(type, "cpu") != 0)
@@ -299,11 +298,8 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
* booted proc.
*/
if (initial_boot_params && initial_boot_params->version >= 2) {
- if (intserv[i] ==
- initial_boot_params->boot_cpuid_phys) {
- found = 1;
- break;
- }
+ if (intserv[i] == initial_boot_params->boot_cpuid_phys)
+ found = boot_cpu_count;
} else {
/*
* Check if it's the boot-cpu, set it's hw index now,
@@ -311,23 +307,20 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
* off secondary threads.
*/
if (of_get_flat_dt_prop(node,
- "linux,boot-cpu", NULL) != NULL) {
- found = 1;
- break;
- }
+ "linux,boot-cpu", NULL) != NULL)
+ found = boot_cpu_count;
}
-
#ifdef CONFIG_SMP
/* logical cpu id is always 0 on UP kernels */
- logical_cpuid++;
+ boot_cpu_count++;
#endif
}
- if (found) {
- DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
+ if (found >= 0) {
+ DBG("boot cpu: logical %d physical %d\n", found,
intserv[i]);
- boot_cpuid = logical_cpuid;
- set_hard_smp_processor_id(boot_cpuid, intserv[i]);
+ boot_cpuid = found;
+ set_hard_smp_processor_id(found, intserv[i]);
/*
* PAPR defines "logical" PVR values for cpus that