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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-03-16 14:54:35 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-20 11:03:24 +1000 |
| commit | 9d07bc841c9779b4d7902e417f4e509996ce805d (patch) | |
| tree | 7a381096d3da7497aac58c4ec18c74299ee47fb4 /arch/powerpc/kernel/prom.c | |
| parent | ad0693ee722b93b63a89c845e99513f242e43aa6 (diff) | |
| download | linux-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.c | 27 |
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 |