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percpu: add __percpu for sparse.

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We have to make __kernel "__attribute__((address_space(0)))" so we can
cast to it.

tj: * put_cpu_var() update.

    * Annotations added to dynamic allocator interface.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Rusty Russell
2009-10-29 22:34:15 +09:00
committed by Tejun Heo
parent f7b64fe806
commit e0fdb0e050
4 changed files with 18 additions and 10 deletions
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18
include/linux/percpu.h
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@@ -30,8 +30,12 @@
preempt_disable(); \
&__get_cpu_var(var); }))
/*
* The weird & is necessary because sparse considers (void)(var) to be
* a direct dereference of percpu variable (var).
*/
#define put_cpu_var(var) do { \
(void)(var); \
(void)&(var); \
preempt_enable(); \
} while (0)
@@ -130,9 +134,9 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size,
*/
#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
extern void *__alloc_reserved_percpu(size_t size, size_t align);
extern void *__alloc_percpu(size_t size, size_t align);
extern void free_percpu(void *__pdata);
extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
extern void __percpu *__alloc_percpu(size_t size, size_t align);
extern void free_percpu(void __percpu *__pdata);
#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
extern void __init setup_per_cpu_areas(void);
@@ -142,7 +146,7 @@ extern void __init setup_per_cpu_areas(void);
#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
static inline void *__alloc_percpu(size_t size, size_t align)
static inline void __percpu *__alloc_percpu(size_t size, size_t align)
{
/*
* Can't easily make larger alignment work with kmalloc. WARN
@@ -153,7 +157,7 @@ static inline void *__alloc_percpu(size_t size, size_t align)
return kzalloc(size, GFP_KERNEL);
}
static inline void free_percpu(void *p)
static inline void free_percpu(void __percpu *p)
{
kfree(p);
}
@@ -168,7 +172,7 @@ static inline void *pcpu_lpage_remapped(void *kaddr)
#endif /* CONFIG_SMP */
#define alloc_percpu(type) \
(typeof(type) *)__alloc_percpu(sizeof(type), __alignof__(type))
(typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
/*
* Optional methods for optimized non-lvalue per-cpu variable access.