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linux/include/asm-generic/percpu.h
Tejun Heo eba117889a percpu: preffity percpu header files 
percpu macros are difficult to read.  It's partly because they're
fairly complex but also because they simply lack visual and
conventional consistency to an unusual degree.  The preceding patches
tried to organize macro definitions consistently by their roles.  This
patch makes the following cosmetic changes to improve overall
readability.

* Use consistent convention for multi-line macro definitions - "do {"
  or "({" are now put on their own lines and the line continuing '\'
  are all put on the same column.

* Temp variables used inside macro are consistently given "__" prefix.

* When a macro argument is passed to another macro or a function,
  putting extra parenthses around it doesn't help anything.  Don't put
  them.

* _this_cpu_generic_*() are renamed to this_cpu_generic_*() so that
  they're consistent with raw_cpu_generic_*().

* Reorganize raw_cpu_*() and this_cpu_*() definitions so that trivial
  wrappers are collected in one place after actual operation
  definitions.

* Other misc cleanups including reorganizing comments.

All changes in this patch are cosmetic and cause no functional
difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
2014-06-17 19:12:40 -04:00

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#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
/*
* 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
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
extern void setup_per_cpu_areas(void);
#endif
#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
#ifndef PER_CPU_ATTRIBUTES
#define PER_CPU_ATTRIBUTES
#endif
#ifndef PER_CPU_DEF_ATTRIBUTES
#define PER_CPU_DEF_ATTRIBUTES
#endif
#define raw_cpu_generic_to_op(pcp, val, op) \
do { \
*raw_cpu_ptr(&(pcp)) op val; \
} while (0)
#define raw_cpu_generic_add_return(pcp, val) \
({ \
raw_cpu_add(pcp, val); \
raw_cpu_read(pcp); \
})
#define raw_cpu_generic_xchg(pcp, nval) \
({ \
typeof(pcp) __ret; \
__ret = raw_cpu_read(pcp); \
raw_cpu_write(pcp, nval); \
__ret; \
})
#define raw_cpu_generic_cmpxchg(pcp, oval, nval) \
({ \
typeof(pcp) __ret; \
__ret = raw_cpu_read(pcp); \
if (__ret == (oval)) \
raw_cpu_write(pcp, nval); \
__ret; \
})
#define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
({ \
int __ret = 0; \
if (raw_cpu_read(pcp1) == (oval1) && \
raw_cpu_read(pcp2) == (oval2)) { \
raw_cpu_write(pcp1, nval1); \
raw_cpu_write(pcp2, nval2); \
__ret = 1; \
} \
(__ret); \
})
#define this_cpu_generic_read(pcp) \
({ \
typeof(pcp) __ret; \
preempt_disable(); \
__ret = *this_cpu_ptr(&(pcp)); \
preempt_enable(); \
__ret; \
})
#define this_cpu_generic_to_op(pcp, val, op) \
do { \
unsigned long __flags; \
raw_local_irq_save(__flags); \
*raw_cpu_ptr(&(pcp)) op val; \
raw_local_irq_restore(__flags); \
} while (0)
#define this_cpu_generic_add_return(pcp, val) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
raw_cpu_add(pcp, val); \
__ret = raw_cpu_read(pcp); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_xchg(pcp, nval) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_read(pcp); \
raw_cpu_write(pcp, nval); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_cmpxchg(pcp, oval, nval) \
({ \
typeof(pcp) __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_read(pcp); \
if (__ret == (oval)) \
raw_cpu_write(pcp, nval); \
raw_local_irq_restore(__flags); \
__ret; \
})
#define this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
({ \
int __ret; \
unsigned long __flags; \
raw_local_irq_save(__flags); \
__ret = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \
oval1, oval2, nval1, nval2); \
raw_local_irq_restore(__flags); \
__ret; \
})
#ifndef raw_cpu_read_1
#define raw_cpu_read_1(pcp) (*raw_cpu_ptr(&(pcp)))
#endif
#ifndef raw_cpu_read_2
#define raw_cpu_read_2(pcp) (*raw_cpu_ptr(&(pcp)))
#endif
#ifndef raw_cpu_read_4
#define raw_cpu_read_4(pcp) (*raw_cpu_ptr(&(pcp)))
#endif
#ifndef raw_cpu_read_8
#define raw_cpu_read_8(pcp) (*raw_cpu_ptr(&(pcp)))
#endif
#ifndef raw_cpu_write_1
#define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_2
#define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_4
#define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_write_8
#define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef raw_cpu_add_1
#define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_2
#define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_4
#define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_add_8
#define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef raw_cpu_and_1
#define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_2
#define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_4
#define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_and_8
#define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef raw_cpu_or_1
#define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_2
#define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_4
#define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_or_8
#define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef raw_cpu_add_return_1
#define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_2
#define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_4
#define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_add_return_8
#define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
#endif
#ifndef raw_cpu_xchg_1
#define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_2
#define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_4
#define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_xchg_8
#define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
#endif
#ifndef raw_cpu_cmpxchg_1
#define raw_cpu_cmpxchg_1(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_2
#define raw_cpu_cmpxchg_2(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_4
#define raw_cpu_cmpxchg_4(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_8
#define raw_cpu_cmpxchg_8(pcp, oval, nval) \
raw_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef raw_cpu_cmpxchg_double_1
#define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_2
#define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_4
#define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef raw_cpu_cmpxchg_double_8
#define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_read_1
#define this_cpu_read_1(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_2
#define this_cpu_read_2(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_4
#define this_cpu_read_4(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_read_8
#define this_cpu_read_8(pcp) this_cpu_generic_read(pcp)
#endif
#ifndef this_cpu_write_1
#define this_cpu_write_1(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_2
#define this_cpu_write_2(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_4
#define this_cpu_write_4(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_write_8
#define this_cpu_write_8(pcp, val) this_cpu_generic_to_op(pcp, val, =)
#endif
#ifndef this_cpu_add_1
#define this_cpu_add_1(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_2
#define this_cpu_add_2(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_4
#define this_cpu_add_4(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_add_8
#define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=)
#endif
#ifndef this_cpu_and_1
#define this_cpu_and_1(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_2
#define this_cpu_and_2(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_4
#define this_cpu_and_4(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_and_8
#define this_cpu_and_8(pcp, val) this_cpu_generic_to_op(pcp, val, &=)
#endif
#ifndef this_cpu_or_1
#define this_cpu_or_1(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_2
#define this_cpu_or_2(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_4
#define this_cpu_or_4(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_or_8
#define this_cpu_or_8(pcp, val) this_cpu_generic_to_op(pcp, val, |=)
#endif
#ifndef this_cpu_add_return_1
#define this_cpu_add_return_1(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_2
#define this_cpu_add_return_2(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_4
#define this_cpu_add_return_4(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_add_return_8
#define this_cpu_add_return_8(pcp, val) this_cpu_generic_add_return(pcp, val)
#endif
#ifndef this_cpu_xchg_1
#define this_cpu_xchg_1(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_2
#define this_cpu_xchg_2(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_4
#define this_cpu_xchg_4(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_xchg_8
#define this_cpu_xchg_8(pcp, nval) this_cpu_generic_xchg(pcp, nval)
#endif
#ifndef this_cpu_cmpxchg_1
#define this_cpu_cmpxchg_1(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_2
#define this_cpu_cmpxchg_2(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_4
#define this_cpu_cmpxchg_4(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_8
#define this_cpu_cmpxchg_8(pcp, oval, nval) \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
#ifndef this_cpu_cmpxchg_double_1
#define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_2
#define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_4
#define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#ifndef this_cpu_cmpxchg_double_8
#define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \
this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
#endif
#endif /* _ASM_GENERIC_PERCPU_H_ */
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