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[CPUFREQ] use dynamic debug instead of custom infrastructure

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With dynamic debug having gained the capability to report debug messages
also during the boot process, it offers a far superior interface for
debug messages than the custom cpufreq infrastructure. As a first step,
remove the old cpufreq_debug_printk() function and replace it with a call
to the generic pr_debug() function.

How can dynamic debug be used on cpufreq? You need a kernel which has
CONFIG_DYNAMIC_DEBUG enabled.

To enabled debugging during runtime, mount debugfs and

$ echo -n 'module cpufreq +p' > /sys/kernel/debug/dynamic_debug/control

for debugging the complete "cpufreq" module. To achieve the same goal during
boot, append

	ddebug_query="module cpufreq +p"

as a boot parameter to the kernel of your choice.

For more detailled instructions, please see
Documentation/dynamic-debug-howto.txt

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dominik Brodowski
2011-03-27 15:04:46 +02:00
committed by Dave Jones
parent 27ecddc2a9
commit 2d06d8c49a
26 changed files with 270 additions and 474 deletions
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19
include/linux/cpufreq.h
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@@ -397,23 +397,4 @@ void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
void cpufreq_frequency_table_put_attr(unsigned int cpu);
/*********************************************************************
* UNIFIED DEBUG HELPERS *
*********************************************************************/
#define CPUFREQ_DEBUG_CORE 1
#define CPUFREQ_DEBUG_DRIVER 2
#define CPUFREQ_DEBUG_GOVERNOR 4
#ifdef CONFIG_CPU_FREQ_DEBUG
extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
const char *fmt, ...);
#else
#define cpufreq_debug_printk(msg...) do { } while(0)
#endif /* CONFIG_CPU_FREQ_DEBUG */
#endif /* _LINUX_CPUFREQ_H */