ae1ee11be7
Allocating PDA and GDT at boot is a pain. Using simple per-cpu variables adds happiness (although we need the GDT page-aligned for Xen, which we do in a followup patch). [akpm@linux-foundation.org: build fix] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
#ifndef _ASM_GENERIC_PERCPU_H_
|
|
#define _ASM_GENERIC_PERCPU_H_
|
|
#include <linux/compiler.h>
|
|
#include <linux/threads.h>
|
|
|
|
#define __GENERIC_PER_CPU
|
|
#ifdef CONFIG_SMP
|
|
|
|
extern unsigned long __per_cpu_offset[NR_CPUS];
|
|
|
|
#define per_cpu_offset(x) (__per_cpu_offset[x])
|
|
|
|
/* Separate out the type, so (int[3], foo) works. */
|
|
#define DEFINE_PER_CPU(type, name) \
|
|
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
|
|
|
|
/* var is in discarded region: offset to particular copy we want */
|
|
#define per_cpu(var, cpu) (*({ \
|
|
extern int simple_identifier_##var(void); \
|
|
RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
|
|
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
|
|
#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
|
|
|
|
/* A macro to avoid #include hell... */
|
|
#define percpu_modcopy(pcpudst, src, size) \
|
|
do { \
|
|
unsigned int __i; \
|
|
for_each_possible_cpu(__i) \
|
|
memcpy((pcpudst)+__per_cpu_offset[__i], \
|
|
(src), (size)); \
|
|
} while (0)
|
|
#else /* ! SMP */
|
|
|
|
#define DEFINE_PER_CPU(type, name) \
|
|
__typeof__(type) per_cpu__##name
|
|
|
|
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
|
|
#define __get_cpu_var(var) per_cpu__##var
|
|
#define __raw_get_cpu_var(var) per_cpu__##var
|
|
|
|
#endif /* SMP */
|
|
|
|
#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
|
|
|
|
#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
|
|
#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
|
|
|
|
#endif /* _ASM_GENERIC_PERCPU_H_ */
|