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ARM: 8130/1: cpuidle/cpuidle-big_little: fix reading cpu id part number

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Commit af040ffc9b ("ARM: make it easier to check the CPU part number
correctly") changed ARM_CPU_PART_X masks, and the way they are returned and
checked against. Usage of read_cpuid_part_number() is now deprecated, and
calling places updated accordingly. This actually broke cpuidle-big_little
initialization, as bl_idle_driver_init() performs a check using an hardcoded
mask on cpu_id.

Create an interface to perform the check (that is now even easier to read).
Define also a proper mask (ARM_CPU_PART_MASK) that makes this kind of checks
cleaner and helps preventing bugs in the future. Update usage accordingly.

Signed-off-by: Juri Lelli <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Signed-off-by: Russell King <[email protected]>
This commit is contained in:
Juri Lelli 2014-08-15 15:53:14 +01:00 • committed by Russell King
commit eba1c71819
3 changed files with 20 additions and 11 deletions
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13
drivers/cpuidle/cpuidle-big_little.c
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@ -138,25 +138,18 @@ static int bl_enter_powerdown(struct cpuidle_device *dev,
return idx;
}
static int __init bl_idle_driver_init(struct cpuidle_driver *drv, int cpu_id)
static int __init bl_idle_driver_init(struct cpuidle_driver *drv, int part_id)
{
struct cpuinfo_arm *cpu_info;
struct cpumask *cpumask;
unsigned long cpuid;
int cpu;
cpumask = kzalloc(cpumask_size(), GFP_KERNEL);
if (!cpumask)
return -ENOMEM;
for_each_possible_cpu(cpu) {
cpu_info = &per_cpu(cpu_data, cpu);
cpuid = is_smp() ? cpu_info->cpuid : read_cpuid_id();
/* read cpu id part number */
if ((cpuid & 0xFFF0) == cpu_id)
for_each_possible_cpu(cpu)
if (smp_cpuid_part(cpu) == part_id)
cpumask_set_cpu(cpu, cpumask);
}
drv->cpumask = cpumask;