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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-01-30 08:42:37 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-02-08 12:21:39 +0300 |
| commit | ffd81dcfef85a33729f90e4acd2f61a68e56b993 (patch) | |
| tree | 4160debd7778d436e027edf810e438266953dc11 /Documentation/cpu-freq/cpu-drivers.txt | |
| parent | 70f6bf2a3b7e40c3f802b0ea837762a8bc6c1430 (diff) | |
| download | linux-ffd81dcfef85a33729f90e4acd2f61a68e56b993.tar.xz | |
cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx()
Pointer subtraction is slow and tedious. Therefore, replace all instances
where cpufreq_for_each_{valid_,}entry loops contained such substractions
with an iteration macro providing an index to the frequency_table entry.
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Link: http://lkml.kernel.org/r/20180120020237.GM13338@ZenIV.linux.org.uk
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/cpu-freq/cpu-drivers.txt')
| -rw-r--r-- | Documentation/cpu-freq/cpu-drivers.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt index 434c49cc7330..61546ac578d6 100644 --- a/Documentation/cpu-freq/cpu-drivers.txt +++ b/Documentation/cpu-freq/cpu-drivers.txt @@ -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(). |