mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 09:36:49 +07:00
fc0091b3c8
By writing directly, a memory access violation can occur whilst hotplugging a CPU if the entry was previously marked read-only. Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Cc: Jeremy Fitzhardinge <Jeremy.Fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
31 lines
729 B
C
31 lines
729 B
C
/*
|
|
* SMP stuff which is common to all sub-architectures.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <asm/smp.h>
|
|
|
|
#ifdef CONFIG_X86_32
|
|
DEFINE_PER_CPU(unsigned long, this_cpu_off);
|
|
EXPORT_PER_CPU_SYMBOL(this_cpu_off);
|
|
|
|
/*
|
|
* Initialize the CPU's GDT. This is either the boot CPU doing itself
|
|
* (still using the master per-cpu area), or a CPU doing it for a
|
|
* secondary which will soon come up.
|
|
*/
|
|
__cpuinit void init_gdt(int cpu)
|
|
{
|
|
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);
|
|
|
|
per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
|
|
per_cpu(cpu_number, cpu) = cpu;
|
|
}
|
|
#endif
|