From: Ben Collins On a UP system with SMP compiled kernel, the powernow-k7 module would not initialize (returned -ENODEV). Not sure why policy->cpu != 0 for UP systems, but since policy->cpu isn't used anywhere, just check for num_cpus in the system, and fail of it's > 1. Signed-off-by: Ben Collins Cc: Dave Jones Cc: Dominik Brodowski Signed-off-by: Andrew Morton --- arch/i386/kernel/cpu/cpufreq/powernow-k7.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff -puN arch/i386/kernel/cpu/cpufreq/powernow-k7.c~powernow-k7-work-when-kernel-is-compiled-for-smp arch/i386/kernel/cpu/cpufreq/powernow-k7.c --- devel/arch/i386/kernel/cpu/cpufreq/powernow-k7.c~powernow-k7-work-when-kernel-is-compiled-for-smp 2006-01-05 22:34:10.000000000 -0800 +++ devel-akpm/arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2006-01-05 22:34:10.000000000 -0800 @@ -576,9 +576,6 @@ static int __init powernow_cpu_init (str union msr_fidvidstatus fidvidstatus; int result; - if (policy->cpu != 0) - return -ENODEV; - rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); /* recalibrate cpu_khz */ @@ -664,8 +661,13 @@ static struct cpufreq_driver powernow_dr static int __init powernow_init (void) { - if (check_powernow()==0) + /* Does not support multi-cpu systems */ + if (num_online_cpus() != 1 || num_possible_cpus() != 1) return -ENODEV; + + if (check_powernow() == 0) + return -ENODEV; + return cpufreq_register_driver(&powernow_driver); } _