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ACPI: processor: fix processor_physically_present in UP kernel

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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=16357

Tested-by: Anton Kochkov <anton.kochkov@gmail.com>
Tested-by: Ambroz Bizjak <ambrop7@gmail.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming
2011-05-16 09:11:00 +08:00
committed by Len Brown
parent 61c4f2c81c
commit 932df74143
2 changed files with 9 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/acpi/processor.h
View File

@ -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);