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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | #ifndef __LINUX_PERCPU_H #define __LINUX_PERCPU_H #include <linux/preempt.h> #include <linux/slab.h> /* For kmalloc() */ #include <linux/smp.h> #include <linux/cpumask.h> #include <asm/percpu.h> #ifdef CONFIG_SMP #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name #ifdef MODULE #define SHARED_ALIGNED_SECTION ".data.percpu" #else #define SHARED_ALIGNED_SECTION ".data.percpu.shared_aligned" #endif #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ __attribute__((__section__(SHARED_ALIGNED_SECTION))) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name \ ____cacheline_aligned_in_smp #else #define DEFINE_PER_CPU(type, name) \ PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ DEFINE_PER_CPU(type, name) #endif #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */ #ifndef PERCPU_ENOUGH_ROOM #ifdef CONFIG_MODULES #define PERCPU_MODULE_RESERVE 8192 #else #define PERCPU_MODULE_RESERVE 0 #endif #define PERCPU_ENOUGH_ROOM \ (__per_cpu_end - __per_cpu_start + PERCPU_MODULE_RESERVE) #endif /* PERCPU_ENOUGH_ROOM */ /* * Must be an lvalue. Since @var must be a simple identifier, * we force a syntax error here if it isn't. */ #define get_cpu_var(var) (*({ \ extern int simple_identifier_##var(void); \ preempt_disable(); \ &__get_cpu_var(var); })) #define put_cpu_var(var) preempt_enable() #ifdef CONFIG_SMP struct percpu_data { void *ptrs[1]; }; #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata) /* * Use this to get to a cpu's version of the per-cpu object dynamically * allocated. Non-atomic access to the current CPU's version should * probably be combined with get_cpu()/put_cpu(). */ #define percpu_ptr(ptr, cpu) \ ({ \ struct percpu_data *__p = __percpu_disguise(ptr); \ (__typeof__(ptr))__p->ptrs[(cpu)]; \ }) extern void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask); extern void percpu_free(void *__pdata); #else /* CONFIG_SMP */ #define percpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) static __always_inline void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask) { return kzalloc(size, gfp); } static inline void percpu_free(void *__pdata) { kfree(__pdata); } #endif /* CONFIG_SMP */ #define percpu_alloc_mask(size, gfp, mask) \ __percpu_alloc_mask((size), (gfp), &(mask)) #define percpu_alloc(size, gfp) percpu_alloc_mask((size), (gfp), cpu_online_map) /* (legacy) interface for use without CPU hotplug handling */ #define __alloc_percpu(size) percpu_alloc_mask((size), GFP_KERNEL, \ cpu_possible_map) #define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type)) #define free_percpu(ptr) percpu_free((ptr)) #define per_cpu_ptr(ptr, cpu) percpu_ptr((ptr), (cpu)) #endif /* __LINUX_PERCPU_H */ |