Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _ASM_POWERPC_PERCPU_H_
2#define _ASM_POWERPC_PERCPU_H_
3#ifdef __powerpc64__
4#include <linux/compiler.h>
5
6/*
7 * Same as asm-generic/percpu.h, except that we store the per cpu offset
8 * in the paca. Based on the x86-64 implementation.
9 */
10
11#ifdef CONFIG_SMP
12
13#include <asm/paca.h>
14
15#define __per_cpu_offset(cpu) (paca[cpu].data_offset)
16#define __my_cpu_offset() get_paca()->data_offset
17#define per_cpu_offset(x) (__per_cpu_offset(x))
18
19/* Separate out the type, so (int[3], foo) works. */
20#define DEFINE_PER_CPU(type, name) \
21 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
22
23#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
24 __attribute__((__section__(".data.percpu.shared_aligned"))) \
25 __typeof__(type) per_cpu__##name \
26 ____cacheline_aligned_in_smp
27
28/* var is in discarded region: offset to particular copy we want */
29#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
30#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
31#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
32
33/* A macro to avoid #include hell... */
34#define percpu_modcopy(pcpudst, src, size) \
35do { \
36 unsigned int __i; \
37 for_each_possible_cpu(__i) \
38 memcpy((pcpudst)+__per_cpu_offset(__i), \
39 (src), (size)); \
40} while (0)
41
42extern void setup_per_cpu_areas(void);
43
44#else /* ! SMP */
45
46#define DEFINE_PER_CPU(type, name) \
47 __typeof__(type) per_cpu__##name
48#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
49 DEFINE_PER_CPU(type, name)
50
51#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
52#define __get_cpu_var(var) per_cpu__##var
53#define __raw_get_cpu_var(var) per_cpu__##var
54
55#endif /* SMP */
56
57#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
58
59#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
60#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
61
62#else
63#include <asm-generic/percpu.h>
64#endif
65
66#endif /* _ASM_POWERPC_PERCPU_H_ */