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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/pm_qos.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include "windfarm.h"
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#define VERSION "0.3"
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static int clamped;
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static struct wf_control *clamp_control;
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static struct freq_qos_request qos_req;
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static unsigned int min_freq, max_freq;
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static int clamp_set(struct wf_control *ct, s32 value)
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{
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unsigned int freq;
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if (value) {
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freq = min_freq;
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printk(KERN_INFO "windfarm: Clamping CPU frequency to "
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"minimum !\n");
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} else {
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freq = max_freq;
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printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
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}
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clamped = value;
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return freq_qos_update_request(&qos_req, freq);
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}
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static int clamp_get(struct wf_control *ct, s32 *value)
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{
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*value = clamped;
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return 0;
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}
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static s32 clamp_min(struct wf_control *ct)
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{
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return 0;
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}
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static s32 clamp_max(struct wf_control *ct)
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{
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return 1;
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}
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static const struct wf_control_ops clamp_ops = {
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.set_value = clamp_set,
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.get_value = clamp_get,
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.get_min = clamp_min,
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.get_max = clamp_max,
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.owner = THIS_MODULE,
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};
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static int __init wf_cpufreq_clamp_init(void)
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{
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struct cpufreq_policy *policy;
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struct wf_control *clamp;
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struct device *dev;
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int ret;
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policy = cpufreq_cpu_get(0);
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if (!policy) {
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pr_warn("%s: cpufreq policy not found cpu0\n", __func__);
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return -EPROBE_DEFER;
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}
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min_freq = policy->cpuinfo.min_freq;
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max_freq = policy->cpuinfo.max_freq;
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ret = freq_qos_add_request(&policy->constraints, &qos_req, FREQ_QOS_MAX,
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max_freq);
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cpufreq_cpu_put(policy);
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if (ret < 0) {
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pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
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ret);
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return ret;
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}
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dev = get_cpu_device(0);
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if (unlikely(!dev)) {
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pr_warn("%s: No cpu device for cpu0\n", __func__);
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ret = -ENODEV;
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goto fail;
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}
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clamp = kmalloc_obj(struct wf_control);
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if (clamp == NULL) {
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ret = -ENOMEM;
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goto fail;
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}
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clamp->ops = &clamp_ops;
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clamp->name = "cpufreq-clamp";
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ret = wf_register_control(clamp);
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if (ret)
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goto free;
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clamp_control = clamp;
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return 0;
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free:
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kfree(clamp);
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fail:
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freq_qos_remove_request(&qos_req);
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return ret;
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}
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static void __exit wf_cpufreq_clamp_exit(void)
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{
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if (clamp_control) {
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wf_unregister_control(clamp_control);
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freq_qos_remove_request(&qos_req);
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}
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}
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module_init(wf_cpufreq_clamp_init);
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module_exit(wf_cpufreq_clamp_exit);
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MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
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MODULE_DESCRIPTION("CPU frequency clamp for PowerMacs thermal control");
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MODULE_LICENSE("GPL");
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