Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.15 54/66] cpufreq: ppc-corenet-cpu-freq: do_div use quotient | Date | Fri, 4 Jul 2014 15:14:53 -0700 |
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3.15-stable review patch. If anyone has any objections, please let me know.
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From: Ed Swarthout <Ed.Swarthout@freescale.com>
commit 906fe033145aab7d65a428bfda2cf19c75720894 upstream.
Commit 6712d2931933 (cpufreq: ppc-corenet-cpufreq: Fix __udivdi3 modpost error) used the remainder from do_div instead of the quotient. Fix that and add one to ensure minimum is met.
Fixes: 6712d2931933 (cpufreq: ppc-corenet-cpufreq: Fix __udivdi3 modpost error) Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/cpufreq/ppc-corenet-cpufreq.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/cpufreq/ppc-corenet-cpufreq.c +++ b/drivers/cpufreq/ppc-corenet-cpufreq.c @@ -138,7 +138,7 @@ static int corenet_cpufreq_cpu_init(stru struct cpufreq_frequency_table *table; struct cpu_data *data; unsigned int cpu = policy->cpu; - u64 transition_latency_hz; + u64 u64temp; np = of_get_cpu_node(cpu, NULL); if (!np) @@ -206,9 +206,10 @@ static int corenet_cpufreq_cpu_init(stru for_each_cpu(i, per_cpu(cpu_mask, cpu)) per_cpu(cpu_data, i) = data; - transition_latency_hz = 12ULL * NSEC_PER_SEC; - policy->cpuinfo.transition_latency = - do_div(transition_latency_hz, fsl_get_sys_freq()); + /* Minimum transition latency is 12 platform clocks */ + u64temp = 12ULL * NSEC_PER_SEC; + do_div(u64temp, fsl_get_sys_freq()); + policy->cpuinfo.transition_latency = u64temp + 1; of_node_put(np);
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