xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] x86: fix broken SMP boot sequence

Browse Source 
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>
This commit is contained in:
James Bottomley
2006-02-24 13:04:14 -08:00
committed by Linus Torvalds
parent 1e275d406b
commit 2b932f6cf0
6 changed files with 39 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/asm-i386/desc.h
View File

@@ -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))