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Commit 0af99b13 authored by Venki Pallipadi's avatar Venki Pallipadi Committed by Dave Jones
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[CPUFREQ] ondemand: add a check to avoid negative load calculation 



Due to rounding and inexact jiffy accounting, idle_ticks can sometimes
be higher than total_ticks. Make sure those cases are handled as
zero load case.

Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent c7f652e0

drivers/cpufreq/cpufreq_ondemand.c

+3 −2
Original line number Diff line number Diff line
@@ -325,7 +325,7 @@ static struct attribute_group dbs_attr_group = { 
static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)

{

	unsigned int idle_ticks, total_ticks;

	unsigned int load;

	unsigned int load = 0;

	cputime64_t cur_jiffies;



	struct cpufreq_policy *policy;
@@ -370,6 +370,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) 
		if (tmp_idle_ticks < idle_ticks)

			idle_ticks = tmp_idle_ticks;

	}

	if (likely(total_ticks > idle_ticks))

		load = (100 * (total_ticks - idle_ticks)) / total_ticks;



	/* Check for frequency increase */