| From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| Date: Thu, 9 Apr 2015 15:23:01 +0200 |
| Subject: cpufreq: drop K8's driver from beeing selected |
| |
| Ralf posted a picture of a backtrace from |
| |
| | powernowk8_target_fn() -> transition_frequency_fidvid() and then at the |
| | end: |
| | 932 policy = cpufreq_cpu_get(smp_processor_id()); |
| | 933 cpufreq_cpu_put(policy); |
| |
| crashing the system on -RT. I assumed that policy was a NULL pointer but |
| was rulled out. Since Ralf can't do any more investigations on this and |
| I have no machine with this, I simply switch it off. |
| |
| Reported-by: Ralf Mardorf <ralf.mardorf@alice-dsl.net> |
| Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| --- |
| drivers/cpufreq/Kconfig.x86 | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/cpufreq/Kconfig.x86 |
| +++ b/drivers/cpufreq/Kconfig.x86 |
| @@ -125,7 +125,7 @@ config X86_POWERNOW_K7_ACPI |
| |
| config X86_POWERNOW_K8 |
| tristate "AMD Opteron/Athlon64 PowerNow!" |
| - depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ |
| + depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE |
| help |
| This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. |
| Support for K10 and newer processors is now in acpi-cpufreq. |
