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[CPUFREQ] powernow-k8: improve error messages 

The most common error with powernow-k8 is an ACPI _PSS error
caused either by failure to load the ACPI processor module
or a bad parse of the _PSS object.  Make the error message
returned to the user in these situations more straightforward
and easier to understand.

-Mark Langsdorf
Operating System Research Center
AMD

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Mark Langsdorf 2008-03-18 15:24:32 -05:00 committed by Dave Jones
parent 860da5e578
commit eba9fe93a2
1 changed files with 13 additions and 2 deletions
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15
arch/x86/kernel/cpu/cpufreq/powernow-k8.c
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@ -1127,12 +1127,23 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
* an UP version, and is deprecated by AMD.
*/
if (num_online_cpus() != 1) {
printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
#ifndef CONFIG_ACPI_PROCESSOR
printk(KERN_ERR PFX "ACPI Processor support is required "
"for SMP systems but is absent. Please load the "
"ACPI Processor module before starting this "
"driver.\n");
#else
printk(KERN_ERR PFX "Your BIOS does not provide ACPI "
"_PSS objects in a way that Linux understands. "
"Please report this to the Linux ACPI maintainers"
" and complain to your BIOS vendor.\n");
#endif
kfree(data);
return -ENODEV;
}
if (pol->cpu != 0) {
printk(KERN_ERR PFX "No _PSS objects for CPU other than CPU0\n");
printk(KERN_ERR PFX "No ACPI _PSS objects for CPU other than "
"CPU0. Complain to your BIOS vendor.\n");
kfree(data);
return -ENODEV;
}