提交 932df741 编写于 作者: L Lin Ming 提交者: Len Brown

ACPI: processor: fix processor_physically_present in UP kernel

Usually, there are multiple processors defined in ACPI table, for
example

    Scope (_PR)
    {
        Processor (CPU0, 0x00, 0x00000410, 0x06) {}
        Processor (CPU1, 0x01, 0x00000410, 0x06) {}
        Processor (CPU2, 0x02, 0x00000410, 0x06) {}
        Processor (CPU3, 0x03, 0x00000410, 0x06) {}
    }

processor_physically_present(...) will be called to check whether those
processors are physically present.

Currently we have below codes in processor_physically_present,

cpuid = acpi_get_cpuid(...);
if ((cpuid == -1) && (num_possible_cpus() > 1))
        return false;
return true;

In UP kernel, acpi_get_cpuid(...) always return -1 and
num_possible_cpus() always return 1, so
processor_physically_present(...) always returns true for all passed in
processor handles.

This is wrong for UP processor or SMP processor running UP kernel.

This patch removes the !SMP version of acpi_get_cpuid(), so both UP and
SMP kernel use the same acpi_get_cpuid function.

And for UP kernel, only processor 0 is valid.

https://bugzilla.kernel.org/show_bug.cgi?id=16548
https://bugzilla.kernel.org/show_bug.cgi?id=16357Tested-by: NAnton Kochkov <anton.kochkov@gmail.com>
Tested-by: NAmbroz Bizjak <ambrop7@gmail.com>
Signed-off-by: NLin Ming <ming.m.lin@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>
上级 61c4f2c8
......@@ -37,7 +37,6 @@ static struct dmi_system_id __initdata processor_idle_dmi_table[] = {
{},
};
#ifdef CONFIG_SMP
static int map_lapic_id(struct acpi_subtable_header *entry,
u32 acpi_id, int *apic_id)
{
......@@ -165,7 +164,9 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
#ifdef CONFIG_SMP
int i;
#endif
int apic_id = -1;
apic_id = map_mat_entry(handle, type, acpi_id);
......@@ -174,14 +175,19 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
if (apic_id == -1)
return apic_id;
#ifdef CONFIG_SMP
for_each_possible_cpu(i) {
if (cpu_physical_id(i) == apic_id)
return i;
}
#else
/* In UP kernel, only processor 0 is valid */
if (apic_id == 0)
return apic_id;
#endif
return -1;
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
#endif
static bool __init processor_physically_present(acpi_handle handle)
{
......@@ -217,7 +223,7 @@ 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) && (num_possible_cpus() > 1))
if (cpuid == -1)
return false;
return true;
......
......@@ -310,14 +310,7 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
/* in processor_core.c */
void acpi_processor_set_pdc(acpi_handle handle);
#ifdef CONFIG_SMP
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
#else
static inline int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
return -1;
}
#endif
/* in processor_throttling.c */
int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
......
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