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Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'pm-domains' 

* pm-cpufreq:
  arm: imx: Add MODULE_ALIAS for cpufreq
  cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx()
  cpufreq: intel_pstate: Enable HWP during system resume on CPU0
  cpufreq: scpi: fix error return code in scpi_cpufreq_init()
  cpufreq: scpi: fix static checker warning cdev isn't an ERR_PTR
  cpufreq: remove at32ap-cpufreq
  cpufreq: AMD: Ignore the check for ProcFeedback in ST/CZ
  cpufreq: Skip cpufreq resume if it's not suspended

* pm-cpuidle:
  x86: PM: Make APM idle driver initialize polling state

* pm-domains:
  PM / domains: Fix up domain-idle-states OF parsing
This commit is contained in:
Rafael J. Wysocki 2018-02-08 10:22:12 +01:00
parent 168b6511e8 d0404738c6 f859422075 a3381e3a65
commit 616f16093d
18 changed files with 166 additions and 238 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/cpu-freq/cpu-drivers.txt
View File

@ -291,3 +291,7 @@ For example:
/* Do something with pos */
pos->frequency = ...
}
If you need to work with the position of pos within driver_freq_table,
do not subtract the pointers, as it is quite costly. Instead, use the
macros cpufreq_for_each_entry_idx() and cpufreq_for_each_valid_entry_idx().

1
arch/x86/kernel/apm_32.c
View File

@ -2389,6 +2389,7 @@ static int __init apm_init(void)
if (HZ != 100)
idle_period = (idle_period * HZ) / 100;
if (idle_threshold < 100) {
cpuidle_poll_state_init(&apm_idle_driver);
if (!cpuidle_register_driver(&apm_idle_driver))
if (cpuidle_register_device(&apm_cpuidle_device))
cpuidle_unregister_driver(&apm_idle_driver);

76
drivers/base/power/domain.c
View File

@ -2290,6 +2290,38 @@ static int genpd_parse_state(struct genpd_power_state *genpd_state,
return 0;
}
static int genpd_iterate_idle_states(struct device_node *dn,
struct genpd_power_state *states)
{
int ret;
struct of_phandle_iterator it;
struct device_node *np;
int i = 0;
ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
if (ret <= 0)
return ret;
/* Loop over the phandles until all the requested entry is found */
of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
np = it.node;
if (!of_match_node(idle_state_match, np))
continue;
if (states) {
ret = genpd_parse_state(&states[i], np);
if (ret) {
pr_err("Parsing idle state node %pOF failed with err %d\n",
np, ret);
of_node_put(np);
return ret;
}
}
i++;
}
return i;
}
/**
* of_genpd_parse_idle_states: Return array of idle states for the genpd.
*
@ -2299,49 +2331,31 @@ static int genpd_parse_state(struct genpd_power_state *genpd_state,
*
* Returns the device states parsed from the OF node. The memory for the states
* is allocated by this function and is the responsibility of the caller to
* free the memory after use.
* free the memory after use. If no domain idle states is found it returns
* -EINVAL and in case of errors, a negative error code.
*/
int of_genpd_parse_idle_states(struct device_node *dn,
struct genpd_power_state **states, int *n)
{
struct genpd_power_state *st;
struct device_node *np;
int i = 0;
int err, ret;
int count;
struct of_phandle_iterator it;
const struct of_device_id *match_id;
int ret;
count = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
if (count <= 0)
return -EINVAL;
ret = genpd_iterate_idle_states(dn, NULL);
if (ret <= 0)
return ret < 0 ? ret : -EINVAL;
st = kcalloc(count, sizeof(*st), GFP_KERNEL);
st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
if (!st)
return -ENOMEM;
/* Loop over the phandles until all the requested entry is found */
of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) {
np = it.node;
match_id = of_match_node(idle_state_match, np);
if (!match_id)
continue;
ret = genpd_parse_state(&st[i++], np);
if (ret) {
pr_err
("Parsing idle state node %pOF failed with err %d\n",
np, ret);
of_node_put(np);
kfree(st);
return ret;
}
ret = genpd_iterate_idle_states(dn, st);
if (ret <= 0) {
kfree(st);
return ret < 0 ? ret : -EINVAL;
}
*n = i;
if (!i)
kfree(st);
else
*states = st;
*states = st;
*n = ret;
return 0;
}

10
drivers/cpufreq/Kconfig
View File

@ -239,16 +239,6 @@ if PPC32 || PPC64
source "drivers/cpufreq/Kconfig.powerpc"
endif
if AVR32
config AVR32_AT32AP_CPUFREQ
bool "CPU frequency driver for AT32AP"
depends on PLATFORM_AT32AP
default n
help
This enables the CPU frequency driver for AT32AP processors.
If in doubt, say N.
endif
if IA64
config IA64_ACPI_CPUFREQ
tristate "ACPI Processor P-States driver"

1
drivers/cpufreq/Makefile
View File

@ -100,7 +100,6 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o
##################################################################################
# Other platform drivers
obj-$(CONFIG_AVR32_AT32AP_CPUFREQ) += at32ap-cpufreq.o
obj-$(CONFIG_BFIN_CPU_FREQ) += blackfin-cpufreq.o
obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o
obj-$(CONFIG_CRIS_MACH_ARTPEC3) += cris-artpec3-cpufreq.o

11
drivers/cpufreq/amd_freq_sensitivity.c
View File

@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/percpu-defs.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
@ -109,12 +110,18 @@ out:
static int __init amd_freq_sensitivity_init(void)
{
u64 val;
struct pci_dev *pcidev;
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return -ENODEV;
if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
return -ENODEV;
pcidev = pci_get_device(PCI_VENDOR_ID_AMD,
PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, NULL);
if (!pcidev) {
if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
return -ENODEV;
}
if (rdmsrl_safe(MSR_AMD64_FREQ_SENSITIVITY_ACTUAL, &val))
return -ENODEV;

127
drivers/cpufreq/at32ap-cpufreq.c
View File

@ -1,127 +0,0 @@
/*
* Copyright (C) 2004-2007 Atmel Corporation
*
* Based on MIPS implementation arch/mips/kernel/time.c
* Copyright 2001 MontaVista Software Inc.
*
* 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
* published by the Free Software Foundation.
*/
/*#define DEBUG*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/slab.h>
static struct cpufreq_frequency_table *freq_table;
static unsigned int ref_freq;
static unsigned long loops_per_jiffy_ref;
static int at32_set_target(struct cpufreq_policy *policy, unsigned int index)
{
unsigned int old_freq, new_freq;
old_freq = policy->cur;
new_freq = freq_table[index].frequency;
if (!ref_freq) {
ref_freq = old_freq;
loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy;
}
if (old_freq < new_freq)
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
loops_per_jiffy_ref, ref_freq, new_freq);
clk_set_rate(policy->clk, new_freq * 1000);
if (new_freq < old_freq)
boot_cpu_data.loops_per_jiffy = cpufreq_scale(
loops_per_jiffy_ref, ref_freq, new_freq);
return 0;
}
static int at32_cpufreq_driver_init(struct cpufreq_policy *policy)
{
unsigned int frequency, rate, min_freq;
struct clk *cpuclk;
int retval, steps, i;
if (policy->cpu != 0)
return -EINVAL;
cpuclk = clk_get(NULL, "cpu");
if (IS_ERR(cpuclk)) {
pr_debug("cpufreq: could not get CPU clk\n");
retval = PTR_ERR(cpuclk);
goto out_err;
}
min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000;
frequency = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
policy->cpuinfo.transition_latency = 0;
/*
* AVR32 CPU frequency rate scales in power of two between maximum and
* minimum, also add space for the table end marker.
*
* Further validate that the frequency is usable, and append it to the
* frequency table.
*/
steps = fls(frequency / min_freq) + 1;
freq_table = kzalloc(steps * sizeof(struct cpufreq_frequency_table),
GFP_KERNEL);
if (!freq_table) {
retval = -ENOMEM;
goto out_err_put_clk;
}
for (i = 0; i < (steps - 1); i++) {
rate = clk_round_rate(cpuclk, frequency * 1000) / 1000;
if (rate != frequency)
freq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
else
freq_table[i].frequency = frequency;
frequency /= 2;
}
policy->clk = cpuclk;
freq_table[steps - 1].frequency = CPUFREQ_TABLE_END;
retval = cpufreq_table_validate_and_show(policy, freq_table);
if (!retval) {
printk("cpufreq: AT32AP CPU frequency driver\n");
return 0;
}
kfree(freq_table);
out_err_put_clk:
clk_put(cpuclk);
out_err:
return retval;
}
static struct cpufreq_driver at32_driver = {
.name = "at32ap",
.init = at32_cpufreq_driver_init,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = at32_set_target,
.get = cpufreq_generic_get,
.flags = CPUFREQ_STICKY,
};
static int __init at32_cpufreq_init(void)
{
return cpufreq_register_driver(&at32_driver);
}
late_initcall(at32_cpufreq_init);

3
drivers/cpufreq/cpufreq.c
View File

@ -1686,6 +1686,9 @@ void cpufreq_resume(void)
if (!cpufreq_driver)
return;
if (unlikely(!cpufreq_suspended))
return;
cpufreq_suspended = false;
if (!has_target() && !cpufreq_driver->resume)

7
drivers/cpufreq/exynos5440-cpufreq.c
View File

@ -115,10 +115,10 @@ static struct cpufreq_freqs freqs;
static int init_div_table(void)
{
struct cpufreq_frequency_table *pos, *freq_tbl = dvfs_info->freq_table;
unsigned int tmp, clk_div, ema_div, freq, volt_id;
unsigned int tmp, clk_div, ema_div, freq, volt_id, idx;
struct dev_pm_opp *opp;
cpufreq_for_each_entry(pos, freq_tbl) {
cpufreq_for_each_entry_idx(pos, freq_tbl, idx) {
opp = dev_pm_opp_find_freq_exact(dvfs_info->dev,
pos->frequency * 1000, true);
if (IS_ERR(opp)) {
@ -154,8 +154,7 @@ static int init_div_table(void)
tmp = (clk_div | ema_div | (volt_id << P0_7_VDD_SHIFT)
| ((freq / FREQ_UNIT) << P0_7_FREQ_SHIFT));
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 *
(pos - freq_tbl));
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * idx);
dev_pm_opp_put(opp);
}

8
drivers/cpufreq/freq_table.c
View File

@ -143,10 +143,9 @@ int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
break;
}
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, i) {
freq = pos->frequency;
i = pos - table;
if ((freq < policy->min) || (freq > policy->max))
continue;
if (freq == target_freq) {
@ -211,15 +210,16 @@ int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
unsigned int freq)
{
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
int idx;
if (unlikely(!table)) {
pr_debug("%s: Unable to find frequency table\n", __func__);
return -ENOENT;
}
cpufreq_for_each_valid_entry(pos, table)
cpufreq_for_each_valid_entry_idx(pos, table, idx)
if (pos->frequency == freq)
return pos - table;
return idx;
return -EINVAL;
}

1
drivers/cpufreq/imx6q-cpufreq.c
View File

@ -504,6 +504,7 @@ static struct platform_driver imx6q_cpufreq_platdrv = {
};
module_platform_driver(imx6q_cpufreq_platdrv);
MODULE_ALIAS("platform:imx6q-cpufreq");
MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
MODULE_DESCRIPTION("Freescale i.MX6Q cpufreq driver");
MODULE_LICENSE("GPL");

5
drivers/cpufreq/intel_pstate.c
View File

@ -779,6 +779,8 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
return 0;
}
static void intel_pstate_hwp_enable(struct cpudata *cpudata);
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
if (!hwp_active)
@ -786,6 +788,9 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
mutex_lock(&intel_pstate_limits_lock);
if (policy->cpu == 0)
intel_pstate_hwp_enable(all_cpu_data[policy->cpu]);
all_cpu_data[policy->cpu]->epp_policy = 0;
intel_pstate_hwp_set(policy->cpu);

4
drivers/cpufreq/longhaul.c
View File

@ -600,7 +600,7 @@ static void longhaul_setup_voltagescaling(void)
/* Calculate kHz for one voltage step */
kHz_step = (highest_speed - min_vid_speed) / numvscales;
cpufreq_for_each_entry(freq_pos, longhaul_table) {
cpufreq_for_each_entry_idx(freq_pos, longhaul_table, j) {
speed = freq_pos->frequency;
if (speed > min_vid_speed)
pos = (speed - min_vid_speed) / kHz_step + minvid.pos;
@ -609,7 +609,7 @@ static void longhaul_setup_voltagescaling(void)
freq_pos->driver_data |= mV_vrm_table[pos] << 8;
vid = vrm_mV_table[mV_vrm_table[pos]];
pr_info("f: %d kHz, index: %d, vid: %d mV\n",
speed, (int)(freq_pos - longhaul_table), vid.mV);
speed, j, vid.mV);
}
can_scale_voltage = 1;

6
drivers/cpufreq/pasemi-cpufreq.c
View File

@ -139,7 +139,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
struct cpufreq_frequency_table *pos;
const u32 *max_freqp;
u32 max_freq;
int cur_astate;
int cur_astate, idx;
struct resource res;
struct device_node *cpu, *dn;
int err = -ENODEV;
@ -198,9 +198,9 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
pr_debug("initializing frequency table\n");
/* initialize frequency table */
cpufreq_for_each_entry(pos, pas_freqs) {
cpufreq_for_each_entry_idx(pos, pas_freqs, idx) {
pos->frequency = get_astate_freq(pos->driver_data) * 100000;
pr_debug("%d: %d\n", (int)(pos - pas_freqs), pos->frequency);
pr_debug("%d: %d\n", idx, pos->frequency);
}
cur_astate = get_cur_astate(policy->cpu);

6
drivers/cpufreq/scpi-cpufreq.c
View File

@ -145,6 +145,7 @@ static int scpi_cpufreq_init(struct cpufreq_policy *policy)
if (IS_ERR(priv->clk)) {
dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d\n",
__func__, cpu_dev->id);
ret = PTR_ERR(priv->clk);
goto out_free_cpufreq_table;
}
@ -197,11 +198,8 @@ static int scpi_cpufreq_exit(struct cpufreq_policy *policy)
static void scpi_cpufreq_ready(struct cpufreq_policy *policy)
{
struct scpi_data *priv = policy->driver_data;
struct thermal_cooling_device *cdev;
cdev = of_cpufreq_cooling_register(policy);
if (!IS_ERR(cdev))
priv->cdev = cdev;
priv->cdev = of_cpufreq_cooling_register(policy);
}
static struct cpufreq_driver scpi_cpufreq_driver = {

5
drivers/sh/clk/core.c
View File

@ -197,10 +197,11 @@ int clk_rate_table_find(struct clk *clk,
unsigned long rate)
{
struct cpufreq_frequency_table *pos;
int idx;
cpufreq_for_each_valid_entry(pos, freq_table)
cpufreq_for_each_valid_entry_idx(pos, freq_table, idx)
if (pos->frequency == rate)
return pos - freq_table;
return idx;
return -ENOENT;
}

4
drivers/staging/irda/drivers/sh_sir.c
View File

@ -226,7 +226,7 @@ static u32 sh_sir_find_sclk(struct clk *irda_clk)
clk_put(pclk);
/* IrDA can not set over peripheral_clk */
cpufreq_for_each_valid_entry(pos, freq_table) {
cpufreq_for_each_valid_entry_idx(pos, freq_table, index) {
u32 freq = pos->frequency;
/* IrDA should not over peripheral_clk */
@ -236,7 +236,7 @@ static u32 sh_sir_find_sclk(struct clk *irda_clk)
tmp = freq % SCLK_BASE;
if (tmp < min) {
min = tmp;
index = pos - freq_table;
break;
}
}

125
include/linux/cpufreq.h
View File

@ -628,6 +628,18 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
#define cpufreq_for_each_entry(pos, table) \
for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
/*
* cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
* with index
* @pos: the cpufreq_frequency_table * to use as a loop cursor.
* @table: the cpufreq_frequency_table * to iterate over.
* @idx: the table entry currently being processed
*/
#define cpufreq_for_each_entry_idx(pos, table, idx) \
for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
pos++, idx++)
/*
* cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
* excluding CPUFREQ_ENTRY_INVALID frequencies.
@ -641,6 +653,21 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
continue; \
else
/*
* cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq
* frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
* @pos: the cpufreq_frequency_table * to use as a loop cursor.
* @table: the cpufreq_frequency_table * to iterate over.
* @idx: the table entry currently being processed
*/
#define cpufreq_for_each_valid_entry_idx(pos, table, idx) \
cpufreq_for_each_entry_idx(pos, table, idx) \
if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
continue; \
else
int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table);
@ -667,19 +694,20 @@ static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq >= target_freq)
return pos - table;
return idx;
best = pos;
best = idx;
}
return best - table;
return best;
}
/* Find lowest freq at or above target in a table in descending order */
@ -687,28 +715,29 @@ static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq > target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found above target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */
@ -728,28 +757,29 @@ static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq < target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found below target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Find highest freq at or below target in a table in descending order */
@ -757,19 +787,20 @@ static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq <= target_freq)
return pos - table;
return idx;
best = pos;
best = idx;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */
@ -789,32 +820,33 @@ static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq < target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found below target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
/* Choose the closest freq */
if (target_freq - best->frequency > freq - target_freq)
return pos - table;
if (target_freq - table[best].frequency > freq - target_freq)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Find closest freq to target in a table in descending order */
@ -822,32 +854,33 @@ static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq > target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found above target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
/* Choose the closest freq */
if (best->frequency - target_freq > target_freq - freq)
return pos - table;
if (table[best].frequency - target_freq > target_freq - freq)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */