| #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 an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE() |
| * to prevent the compiler from making incorrect assumptions about the |
| * pointer value. The 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)); \ |
| }) |
| |
| /* |
| * 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))) |
| |
| /* |
| * Arch may define arch_raw_cpu_ptr() to provide more efficient address |
| * translations for raw_cpu_ptr(). |
| */ |
| #ifndef arch_raw_cpu_ptr |
| #define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset) |
| #endif |
| |
| #define raw_cpu_ptr(ptr) arch_raw_cpu_ptr(ptr) |
| |
| #ifdef CONFIG_DEBUG_PREEMPT |
| #define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset) |
| #else |
| #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr) |
| #endif |
| |
| #define __get_cpu_var(var) (*this_cpu_ptr(&(var))) |
| #define __raw_get_cpu_var(var) (*raw_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 raw_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 |
| |
| /* Keep until we have removed all uses of __this_cpu_ptr */ |
| #define __this_cpu_ptr raw_cpu_ptr |
| |
| #endif /* _ASM_GENERIC_PERCPU_H_ */ |