Use container_of instead of casting first structure member.

Signed-off-by: Fabian Frederick <f...@skynet.be>
---

Compiled but untested.

 drivers/acpi/processor_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index e32321c..ef58f46 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -16,7 +16,7 @@ static int map_lapic_id(struct acpi_subtable_header *entry,
                 u32 acpi_id, int *apic_id)
 {
        struct acpi_madt_local_apic *lapic =
-               (struct acpi_madt_local_apic *)entry;
+               container_of(entry, struct acpi_madt_local_apic, header);
 
        if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
                return -ENODEV;
@@ -32,7 +32,7 @@ static int map_x2apic_id(struct acpi_subtable_header *entry,
                         int device_declaration, u32 acpi_id, int *apic_id)
 {
        struct acpi_madt_local_x2apic *apic =
-               (struct acpi_madt_local_x2apic *)entry;
+               container_of(entry, struct acpi_madt_local_x2apic, header);
 
        if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
                return -ENODEV;
@@ -49,7 +49,7 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
                int device_declaration, u32 acpi_id, int *apic_id)
 {
        struct acpi_madt_local_sapic *lsapic =
-               (struct acpi_madt_local_sapic *)entry;
+               container_of(entry, struct acpi_madt_local_sapic, header);
 
        if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
                return -ENODEV;
-- 
1.9.1

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