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Subject[PATCH v3 5/5] acpi/processor: Check for duplicate processor ids at hotplug time
Date
The check for duplicate processor ids happens at boot time based on the
ACPI table contents, but the final sanity checks for a processor happen
at hotplug time.

At hotplug time, where the physical information is available, which might
differ from the ACPI table information, a check for duplicate processor
ids is missing.

Add it to the hotplug checks and rename the function so it better
reflects its purpose.

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Tested-by: Xiaolong Ye <xiaolong.ye@intel.com>
---
drivers/acpi/acpi_processor.c | 13 ++++++++++---
include/linux/acpi.h | 2 +-
2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 9a98d7e..3ce2e9e 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -280,6 +280,13 @@ static int acpi_processor_get_info(struct acpi_device *device)
pr->acpi_id = value;
}

+ if (acpi_duplicate_processor_id(pr->acpi_id)) {
+ dev_err(&device->dev,
+ "Failed to get unique processor _UID (0x%x)\n",
+ pr->acpi_id);
+ return -ENODEV;
+ }
+
pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
pr->acpi_id);
if (invalid_phys_cpuid(pr->phys_id))
@@ -580,7 +587,7 @@ static struct acpi_scan_handler processor_container_handler = {
static int nr_unique_ids __initdata;

/* The number of the duplicate processor IDs */
-static int nr_duplicate_ids __initdata;
+static int nr_duplicate_ids;

/* Used to store the unique processor IDs */
static int unique_processor_ids[] __initdata = {
@@ -588,7 +595,7 @@ static int unique_processor_ids[] __initdata = {
};

/* Used to store the duplicate processor IDs */
-static int duplicate_processor_ids[] __initdata = {
+static int duplicate_processor_ids[] = {
[0 ... NR_CPUS - 1] = -1,
};

@@ -679,7 +686,7 @@ void __init acpi_processor_check_duplicates(void)
NULL, NULL);
}

-bool __init acpi_processor_validate_proc_id(int proc_id)
+bool acpi_duplicate_processor_id(int proc_id)
{
int i;

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 63a7519..9b05886 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -287,7 +287,7 @@ static inline bool invalid_phys_cpuid(phys_cpuid_t phys_id)
}

/* Validate the processor object's proc_id */
-bool acpi_processor_validate_proc_id(int proc_id);
+bool acpi_duplicate_processor_id(int proc_id);

#ifdef CONFIG_ACPI_HOTPLUG_CPU
/* Arch dependent functions for cpu hotplug support */
--
2.5.5


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