[PATCH V2] cpufreq: skip invalid entries when searching the frequency

From: Viresh Kumar
Date: Tue Oct 11 2016 - 23:16:52 EST


From: Aaro Koskinen <aaro.koskinen@xxxxxx>

Skip invalid entries when searching the frequency. This fixes cpufreq
at least on loongson2 MIPS board.

Fixes: da0c6dc00c69 ("cpufreq: Handle sorted frequency tables more efficiently")
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
V1->V2:
- Use cpufreq_frequency_table() instead.

Hi Aaro,

Can you please test this patch instead?

include/linux/cpufreq.h | 104 ++++++++++++++++++++++++------------------------
1 file changed, 52 insertions(+), 52 deletions(-)

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 631ba33bbe9f..5fa55fc56e18 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -639,19 +639,19 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq >= target_freq)
- return i;
+ return pos - table;

- best = i;
+ best = pos;
}

- return best;
+ return best - table;
}

/* Find lowest freq at or above target in a table in descending order */
@@ -659,28 +659,28 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq == target_freq)
- return i;
+ return pos - table;

if (freq > target_freq) {
- best = i;
+ best = pos;
continue;
}

/* No freq found above target_freq */
- if (best == -1)
- return i;
+ if (best == table - 1)
+ return pos - table;

- return best;
+ return best - pos;
}

- return best;
+ return best - pos;
}

/* Works only on sorted freq-tables */
@@ -700,28 +700,28 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq == target_freq)
- return i;
+ return pos - table;

if (freq < target_freq) {
- best = i;
+ best = pos;
continue;
}

/* No freq found below target_freq */
- if (best == -1)
- return i;
+ if (best == table - 1)
+ return pos - table;

- return best;
+ return best - table;
}

- return best;
+ return best - table;
}

/* Find highest freq at or below target in a table in descending order */
@@ -729,19 +729,19 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq <= target_freq)
- return i;
+ return pos - table;

- best = i;
+ best = pos;
}

- return best;
+ return best - table;
}

/* Works only on sorted freq-tables */
@@ -761,32 +761,32 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq == target_freq)
- return i;
+ return pos - table;

if (freq < target_freq) {
- best = i;
+ best = pos;
continue;
}

/* No freq found below target_freq */
- if (best == -1)
- return i;
+ if (best == table - 1)
+ return pos - table;

/* Choose the closest freq */
- if (target_freq - table[best].frequency > freq - target_freq)
- return i;
+ if (target_freq - best->frequency > freq - target_freq)
+ return pos - table;

- return best;
+ return best - table;
}

- return best;
+ return best - table;
}

/* Find closest freq to target in a table in descending order */
@@ -794,32 +794,32 @@ 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;
unsigned int freq;
- int i, best = -1;

- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
- freq = table[i].frequency;
+ cpufreq_for_each_valid_entry(pos, table) {
+ freq = pos->frequency;

if (freq == target_freq)
- return i;
+ return pos - table;

if (freq > target_freq) {
- best = i;
+ best = pos;
continue;
}

/* No freq found above target_freq */
- if (best == -1)
- return i;
+ if (best == table - 1)
+ return pos - table;

/* Choose the closest freq */
- if (table[best].frequency - target_freq > target_freq - freq)
- return i;
+ if (best->frequency - target_freq > target_freq - freq)
+ return pos - table;

- return best;
+ return best - table;
}

- return best;
+ return best - table;
}

/* Works only on sorted freq-tables */
--
2.7.1.410.g6faf27b