x86: initialize per-cpu GDT segment in per-cpu setup
Impact: cleanup
Rename init_gdt() to setup_percpu_segment(), and move it to
setup_percpu.c.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 599dc1c..bcca3a7 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -40,6 +40,19 @@
};
EXPORT_SYMBOL(__per_cpu_offset);
+static inline void setup_percpu_segment(int cpu)
+{
+#ifdef CONFIG_X86_32
+ struct desc_struct gdt;
+
+ pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
+ 0x2 | DESCTYPE_S, 0x8);
+ gdt.s = 1;
+ write_gdt_entry(get_cpu_gdt_table(cpu),
+ GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
+#endif
+}
+
/*
* Great future plan:
* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
@@ -81,6 +94,7 @@
per_cpu_offset(cpu) = ptr - __per_cpu_start;
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
+ setup_percpu_segment(cpu);
/*
* Copy data used in early init routines from the initial arrays to the
* per cpu data areas. These arrays then become expendable and the