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ACPI / processor: Introduce invalid_logical_cpuid() 

In ACPI processor drivers, we use direct comparisons of cpu logical
id with -1 which are error prone in case logical cpuid is accidentally
assinged an error code and prevents us from returning an error-encoding
cpuid directly in some cases.

So introduce invalid_logical_cpuid() to identify cpu with invalid
logical cpu num, then it will be used to replace the direct comparisons
with -1.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hanjun Guo 2015-05-11 12:17:13 +08:00 committed by Rafael J. Wysocki
parent 030bbdbf4c
commit 25956b6612
3 changed files with 9 additions and 6 deletions
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5
drivers/acpi/acpi_processor.c
View File

@ -275,7 +275,8 @@ static int acpi_processor_get_info(struct acpi_device *device)
* Handle UP system running SMP kernel, with no CPU
* entry in MADT
*/
if ((cpu_index == -1) && (num_online_cpus() == 1))
if (invalid_logical_cpuid(cpu_index)
&& (num_online_cpus() == 1))
cpu_index = 0;
}
pr->id = cpu_index;
@ -285,7 +286,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
* less than the max # of CPUs. They should be ignored _iff
* they are physically not present.
*/
if (pr->id == -1) {
if (invalid_logical_cpuid(pr->id)) {
int ret = acpi_processor_hotadd_init(pr);
if (ret)
return ret;

5
drivers/acpi/processor_pdc.c
View File

@ -52,10 +52,7 @@ static bool __init processor_physically_present(acpi_handle handle)
type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
cpuid = acpi_get_cpuid(handle, type, acpi_id);
if (cpuid == -1)
return false;
return true;
return !invalid_logical_cpuid(cpuid);
}
static void acpi_set_pdc_bits(u32 *buf)

5
include/linux/acpi.h
View File

@ -158,6 +158,11 @@ typedef u32 phys_cpuid_t;
#define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
#endif
static inline bool invalid_logical_cpuid(u32 cpuid)
{
return (int)cpuid < 0;
}
#ifdef CONFIG_ACPI_HOTPLUG_CPU
/* Arch dependent functions for cpu hotplug support */
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu);