acpi: Validate processor id when mapping the processor

When we want to identify whether the proc_id is unreasonable or not, we
can call the "acpi_processor_validate_proc_id" function. It will search
in the duplicate IDs. If we find the proc_id in the IDs, we return true
to the call function. Conversely, the false represents available.

When we establish all possible cpuid <-> nodeid mapping to handle the
cpu hotplugs, we will use the proc_id from ACPI table.

We do validation when we get the proc_id. If the result is true, we
will stop the mapping.

[ tglx: Mark the new function __init ]

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: mika.j.penttila@gmail.com
Cc: len.brown@intel.com
Cc: rafael@kernel.org
Cc: rjw@rjwysocki.net
Cc: yasu.isimatu@gmail.com
Cc: linux-mm@kvack.org
Cc: linux-acpi@vger.kernel.org
Cc: isimatu.yasuaki@jp.fujitsu.com
Cc: gongzhaogang@inspur.com
Cc: tj@kernel.org
Cc: izumi.taku@jp.fujitsu.com
Cc: cl@linux.com
Cc: chen.tang@easystack.cn
Cc: akpm@linux-foundation.org
Cc: kamezawa.hiroyu@jp.fujitsu.com
Cc: lenb@kernel.org
Link: http://lkml.kernel.org/r/1472114120-3281-8-git-send-email-douly.fnst@cn.fujitsu.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index f27c709..3de3b6b 100644 (file)
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -659,6 +659,21 @@ static void __init acpi_processor_check_duplicates(void)
                                                NULL, NULL, NULL);
 }
 
+bool __init acpi_processor_validate_proc_id(int proc_id)
+{
+       int i;
+
+       /*
+        * compare the proc_id with duplicate IDs, if the proc_id is already
+        * in the duplicate IDs, return true, otherwise, return false.
+        */
+       for (i = 0; i < nr_duplicate_ids; i++) {
+               if (duplicate_processor_ids[i] == proc_id)
+                       return true;
+       }
+       return false;
+}
+
 void __init acpi_processor_init(void)
 {
        acpi_processor_check_duplicates();

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 8801976..9ac265f 100644 (file)
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -302,6 +302,10 @@ map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
                if (ACPI_FAILURE(status))
                        return false;
                acpi_id = object.processor.proc_id;
+
+               /* validate the acpi_id */
+               if(acpi_processor_validate_proc_id(acpi_id))
+                       return false;
                break;
        case ACPI_TYPE_DEVICE:
                status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 5b4f9ac..7f307f3 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -267,6 +267,9 @@ static inline bool invalid_phys_cpuid(phys_cpuid_t phys_id)
        return phys_id == PHYS_CPUID_INVALID;
 }
 
+/* Validate the processor object's proc_id */
+bool acpi_processor_validate_proc_id(int proc_id);
+
 #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);