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authorJames Bottomley <James.Bottomley@SteelEye.com>2006-02-24 13:04:14 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-24 14:31:38 -0800
commit2b932f6cf052920fb3a6281499e08209b08f5086 (patch)
treec2710e09dd40ee9733bcd77234d6373acec741d2 /include/asm-i386/desc.h
parent1e275d406bf6b88e4de6925cf594b64bb2ec49bc (diff)
downloadop-kernel-dev-2b932f6cf052920fb3a6281499e08209b08f5086.zip
op-kernel-dev-2b932f6cf052920fb3a6281499e08209b08f5086.tar.gz
[PATCH] x86: fix broken SMP boot sequence
Recent GDT changes broke the SMP boot sequence if the booting CPU is numbered anything other than zero. There's also a subtle source of error in that the boot time CPU now uses cpu_gdt_table (which is actually the GDT for booting CPUs in head.S). This patch fixes both problems by making GDT descriptors themselves allocated from a per_cpu area and switching to them in cpu_init(), which now means that cpu_gdt_table is exclusively used for booting CPUs again. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com> Cc: Zachary Amsden <zach@vmware.com> Cc: Matt Tolentino <metolent@snoqualmie.dp.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/desc.h')
-rw-r--r--include/asm-i386/desc.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 494e73b..89b8b82 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -24,11 +24,13 @@ struct Xgt_desc_struct {
unsigned short pad;
} __attribute__ ((packed));
-extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS];
+extern struct Xgt_desc_struct idt_descr;
+DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
+
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
{
- return ((struct desc_struct *)cpu_gdt_descr[cpu].address);
+ return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
}
#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
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