From 208b3a4c196e733b9cec006dc132cfc149b2810a Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 20 May 2011 17:50:18 +1000 Subject: [PATCH] powerpc: Fix hard CPU IDs detection commit 9d07bc841c9779b4d7902e417f4e509996ce805d "powerpc: Properly handshake CPUs going out of boot spin loop" Would cause a miscalculation of the hard CPU ID. It removes breaking out of the loop when finding a match with a processor, thus the "i" used as an index in the intserv array is always incorrect This broke interrupt on my PowerMac laptop. Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/prom.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 5311a26dcf46..48aeb55faae9 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -278,6 +278,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node, int i, nthreads; unsigned long len; int found = -1; + int found_thread = 0; /* We are scanning "cpu" nodes only */ if (type == NULL || strcmp(type, "cpu") != 0) @@ -301,9 +302,11 @@ static int __init early_init_dt_scan_cpus(unsigned long node, * version 2 of the kexec param format adds the phys cpuid of * booted proc. */ - if (initial_boot_params && initial_boot_params->version >= 2) { - if (intserv[i] == initial_boot_params->boot_cpuid_phys) + if (initial_boot_params->version >= 2) { + if (intserv[i] == initial_boot_params->boot_cpuid_phys) { found = boot_cpu_count; + found_thread = i; + } } else { /* * Check if it's the boot-cpu, set it's hw index now, @@ -322,9 +325,9 @@ static int __init early_init_dt_scan_cpus(unsigned long node, if (found >= 0) { DBG("boot cpu: logical %d physical %d\n", found, - intserv[i]); + intserv[found_thread]); boot_cpuid = found; - set_hard_smp_processor_id(found, intserv[i]); + set_hard_smp_processor_id(found, intserv[found_thread]); /* * PAPR defines "logical" PVR values for cpus that -- 2.20.1