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authorPhilippe Longepe <philippe.longepe@linux.intel.com>2016-03-06 08:34:04 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-11 00:04:58 +0100
commita158bed5dc92bd83338225135d448958e0b3745d (patch)
tree6d7a975d9efd6809b3379e91b2351b11947a979c /drivers/cpufreq
parentb54a0dfd56d5c314302987e0ff173b3f1bfcb555 (diff)
downloadlinux-a158bed5dc92bd83338225135d448958e0b3745d.tar.bz2
intel_pstate: Optimize calculation for max/min_perf_adj
mul_fp(int_tofp(A), B) expands to: ((A << FRAC_BITS) * B) >> FRAC_BITS, so the same result can be obtained via simple multiplication A * B. Apply this observation to max_perf * limits->max_perf and max_perf * limits->min_perf in intel_pstate_get_min_max()." Signed-off-by: Philippe Longepe <philippe.longepe@linux.intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/intel_pstate.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 864214de5cdf..5b5bfc1c90f1 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -831,11 +831,11 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
* policy, or by cpu specific default values determined through
* experimentation.
*/
- max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits->max_perf));
+ max_perf_adj = fp_toint(max_perf * limits->max_perf);
*max = clamp_t(int, max_perf_adj,
cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
- min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits->min_perf));
+ min_perf = fp_toint(max_perf * limits->min_perf);
*min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
}