forked from luck/tmp_suning_uos_patched
677243d749
Redefine __get_cpu_var() using this_cpu_ptr() which can be arch-optimized. Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
#ifndef _ASM_GENERIC_PERCPU_H_
|
|
#define _ASM_GENERIC_PERCPU_H_
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/percpu-defs.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/*
|
|
* per_cpu_offset() is the offset that has to be added to a
|
|
* percpu variable to get to the instance for a certain processor.
|
|
*
|
|
* Most arches use the __per_cpu_offset array for those offsets but
|
|
* some arches have their own ways of determining the offset (x86_64, s390).
|
|
*/
|
|
#ifndef __per_cpu_offset
|
|
extern unsigned long __per_cpu_offset[NR_CPUS];
|
|
|
|
#define per_cpu_offset(x) (__per_cpu_offset[x])
|
|
#endif
|
|
|
|
/*
|
|
* Determine the offset for the currently active processor.
|
|
* An arch may define __my_cpu_offset to provide a more effective
|
|
* means of obtaining the offset to the per cpu variables of the
|
|
* current processor.
|
|
*/
|
|
#ifndef __my_cpu_offset
|
|
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
|
|
#endif
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
#define my_cpu_offset per_cpu_offset(smp_processor_id())
|
|
#else
|
|
#define my_cpu_offset __my_cpu_offset
|
|
#endif
|
|
|
|
/*
|
|
* Add a offset to a pointer but keep the pointer as is.
|
|
*
|
|
* Only S390 provides its own means of moving the pointer.
|
|
*/
|
|
#ifndef SHIFT_PERCPU_PTR
|
|
/* Weird cast keeps both GCC and sparse happy. */
|
|
#define SHIFT_PERCPU_PTR(__p, __offset) ({ \
|
|
__verify_pcpu_ptr((__p)); \
|
|
RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
|
|
})
|
|
#endif
|
|
|
|
/*
|
|
* A percpu variable may point to a discarded regions. The following are
|
|
* established ways to produce a usable pointer from the percpu variable
|
|
* offset.
|
|
*/
|
|
#define per_cpu(var, cpu) \
|
|
(*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
|
|
|
|
#ifndef __this_cpu_ptr
|
|
#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
|
|
#endif
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)
|
|
#else
|
|
#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr)
|
|
#endif
|
|
|
|
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
|
|
#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var)))
|
|
|
|
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
|
|
extern void setup_per_cpu_areas(void);
|
|
#endif
|
|
|
|
#else /* ! SMP */
|
|
|
|
#define VERIFY_PERCPU_PTR(__p) ({ \
|
|
__verify_pcpu_ptr((__p)); \
|
|
(typeof(*(__p)) __kernel __force *)(__p); \
|
|
})
|
|
|
|
#define per_cpu(var, cpu) (*((void)(cpu), VERIFY_PERCPU_PTR(&(var))))
|
|
#define __get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
|
|
#define __raw_get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
|
|
#define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
|
|
#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)
|
|
|
|
#endif /* SMP */
|
|
|
|
#ifndef PER_CPU_BASE_SECTION
|
|
#ifdef CONFIG_SMP
|
|
#define PER_CPU_BASE_SECTION ".data..percpu"
|
|
#else
|
|
#define PER_CPU_BASE_SECTION ".data"
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#ifdef MODULE
|
|
#define PER_CPU_SHARED_ALIGNED_SECTION ""
|
|
#define PER_CPU_ALIGNED_SECTION ""
|
|
#else
|
|
#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
|
|
#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
|
|
#endif
|
|
#define PER_CPU_FIRST_SECTION "..first"
|
|
|
|
#else
|
|
|
|
#define PER_CPU_SHARED_ALIGNED_SECTION ""
|
|
#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
|
|
#define PER_CPU_FIRST_SECTION ""
|
|
|
|
#endif
|
|
|
|
#ifndef PER_CPU_ATTRIBUTES
|
|
#define PER_CPU_ATTRIBUTES
|
|
#endif
|
|
|
|
#ifndef PER_CPU_DEF_ATTRIBUTES
|
|
#define PER_CPU_DEF_ATTRIBUTES
|
|
#endif
|
|
|
|
#endif /* _ASM_GENERIC_PERCPU_H_ */
|