From 2b932f6cf052920fb3a6281499e08209b08f5086 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Fri, 24 Feb 2006 13:04:14 -0800 Subject: [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 Cc: Zachary Amsden Cc: Matt Tolentino Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-i386/desc.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include/asm-i386') diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h index 494e73bca095..89b8b82c82b3 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)) -- cgit v1.2.3