by
[2.5. PATCH] cpufreq: /proc/sys/cpu and /proc/cpufreq can be used simultaneously
Both the /proc/sys/cpu/ and /proc/cpufreq interface can safely be
enabled in the same kernel. Only minor updates are needed in order to
allow this to be done.
Dominik
diff -ruN linux-2545original/arch/i386/Kconfig linux/arch/i386/Kconfig
--- linux-2545original/arch/i386/Kconfig Thu Oct 31 12:00:00 2002
+++ linux/arch/i386/Kconfig Thu Oct 31 21:30:00 2002
@@ -471,26 +471,19 @@
If in doubt, say N.
config CPU_FREQ_24_API
- bool "/proc/sys/cpu/ interface (2.4.)"
+ bool "/proc/sys/cpu/ interface (2.4. / OLD)"
depends on CPU_FREQ
- ---help---
+ help
This enables the /proc/sys/cpu/ sysctl interface for controlling
- CPUFreq, as known from the 2.4.-kernel patches for CPUFreq. Note
- that some drivers do not support this interface or offer less
- functionality.
-
- If you say N here, you'll be able to control CPUFreq using the
- new /proc/cpufreq interface.
+ CPUFreq, as known from the 2.4.-kernel patches for CPUFreq. 2.5
+ uses /proc/cpufreq instead. Please note that some drivers do not
+ work well with the 2.4. /proc/sys/cpu sysctl interface, so if in
+ doubt, say N here.
For details, take a look at linux/Documentation/cpufreq.
If in doubt, say N.
-config CPU_FREQ_26_API
- bool
- depends on CPU_FREQ && !CPU_FREQ_24_API
- default y
-
config X86_POWERNOW_K6
tristate "AMD Mobile K6-2/K6-3 PowerNow!"
depends on CPU_FREQ
@@ -561,7 +554,7 @@
config X86_LONGRUN
tristate "Transmeta LongRun"
- depends on CPU_FREQ && !CPU_FREQ_24_API
+ depends on CPU_FREQ
help
This adds the CPUFreq driver for Transmeta Crusoe processors which
support LongRun.
diff -ruN linux-2545original/include/linux/cpufreq.h linux/include/linux/cpufreq.h
--- linux-2545original/include/linux/cpufreq.h Thu Oct 31 12:00:00 2002
+++ linux/include/linux/cpufreq.h Thu Oct 31 21:30:00 2002
@@ -5,7 +5,7 @@
* (C) 2002 Dominik Brodowski <li...@brodo.de>
*
*
- * $Id: cpufreq.h,v 1.26 2002/09/21 09:05:29 db Exp $
+ * $Id: cpufreq.h,v 1.27 2002/10/08 14:54:23 db Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -148,11 +148,9 @@
int cpufreq_set_policy(struct cpufreq_policy *policy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
-#ifdef CONFIG_CPU_FREQ_26_API
#ifdef CONFIG_PM
int cpufreq_restore(void);
#endif
-#endif
#ifdef CONFIG_CPU_FREQ_24_API
@@ -160,9 +158,6 @@
* CPUFREQ 2.4. INTERFACE *
*********************************************************************/
int cpufreq_setmax(unsigned int cpu);
-#ifdef CONFIG_PM
-int cpufreq_restore(void);
-#endif
int cpufreq_set(unsigned int kHz, unsigned int cpu);
unsigned int cpufreq_get(unsigned int cpu);
diff -ruN linux-2545original/kernel/cpufreq.c linux/kernel/cpufreq.c
--- linux-2545original/kernel/cpufreq.c Thu Oct 31 12:00:00 2002
+++ linux/kernel/cpufreq.c Thu Oct 31 21:30:00 2002
@@ -4,7 +4,7 @@
* Copyright (C) 2001 Russell King
* (C) 2002 Dominik Brodowski <li...@brodo.de>
*
- * $Id: cpufreq.c,v 1.43 2002/09/21 09:05:29 db Exp $
+ * $Id: cpufreq.c,v 1.45 2002/10/08 14:54:23 db Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -21,13 +21,10 @@
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/ctype.h>
+#include <linux/proc_fs.h>
#include <asm/uaccess.h>
-#ifdef CONFIG_CPU_FREQ_26_API
-#include <linux/proc_fs.h>
-#endif
-
#ifdef CONFIG_CPU_FREQ_24_API
#include <linux/sysctl.h>
#endif
@@ -200,7 +197,6 @@
__setup("cpufreq=", cpufreq_setup);
-#ifdef CONFIG_CPU_FREQ_26_API
#ifdef CONFIG_PROC_FS
/**
@@ -335,7 +331,6 @@
return;
}
#endif /* CONFIG_PROC_FS */
-#endif /* CONFIG_CPU_FREQ_26_API */
@@ -344,10 +339,6 @@
*********************************************************************/
#ifdef CONFIG_CPU_FREQ_24_API
-/* NOTE #1: when you use this API, you may not use any other calls,
- * except cpufreq_[un]register_notifier, of course.
- */
-
/**
* cpufreq_set - set the CPU frequency
* @freq: target frequency in kHz
@@ -879,7 +870,7 @@
cpufreq_driver->policy[policy->cpu].max = policy->max;
cpufreq_driver->policy[policy->cpu].policy = policy->policy;
}
-
+
#ifdef CONFIG_CPU_FREQ_24_API
if (policy->cpu == CPUFREQ_ALL_CPUS) {
for (i=0;i<NR_CPUS;i++)
@@ -945,6 +936,14 @@
case CPUFREQ_POSTCHANGE:
adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
+#ifdef CONFIG_CPU_FREQ_24_API
+ if (freqs->cpu == CPUFREQ_ALL_CPUS) {
+ int i;
+ for (i=0;i<NR_CPUS;i++)
+ cpu_cur_freq[i] = freqs->new;
+ } else
+ cpu_cur_freq[freqs->cpu] = freqs->new;
+#endif
break;
}
up(&cpufreq_notifier_sem);
@@ -992,9 +991,7 @@
ret = cpufreq_set_policy(&default_policy);
-#ifdef CONFIG_CPU_FREQ_26_API
cpufreq_proc_init();
-#endif
#ifdef CONFIG_CPU_FREQ_24_API
down(&cpufreq_driver_sem);
@@ -1042,9 +1039,7 @@
up(&cpufreq_driver_sem);
-#ifdef CONFIG_CPU_FREQ_26_API
cpufreq_proc_exit();
-#endif
#ifdef CONFIG_CPU_FREQ_24_API
cpufreq_sysctl_exit();
@@ -1086,13 +1081,7 @@
policy.cpu = i;
up(&cpufreq_driver_sem);
-#ifdef CONFIG_CPU_FREQ_26_API
cpufreq_set_policy(&policy);
-#endif
-
-#ifdef CONFIG_CPU_FREQ_24_API
- cpufreq_set(cpu_cur_freq[i], i);
-#endif
}
return 0;
diff -ruN linux-2545original/arch/i386/kernel/cpu/cpufreq/longrun.c linux/arch/i386/kernel/cpu/cpufreq/longrun.c
--- linux-2545original/arch/i386/kernel/cpu/cpufreq/longrun.c Thu Oct 31 12:00:00 2002
+++ linux/arch/i386/kernel/cpu/cpufreq/longrun.c Thu Oct 31 21:30:00 2002
@@ -251,6 +251,11 @@
longrun_get_policy(&driver->policy[0]);
+#ifdef CONFIG_CPU_FREQ_24_API
+ driver->cpu_min_freq = longrun_low_freq;
+ driver->cpu_cur_freq[0] = longrun_high_freq; /* dummy value */
+#endif
+
driver->verify = &longrun_verify_policy;
driver->setpolicy = &longrun_set_policy;
result = cpufreq_register(driver);
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