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percpu: reorder macros in percpu header files

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* In include/asm-generic/percpu.h, collect {raw|_this}_cpu_generic*()
  macros into one place.  They were dispersed through
  {raw|this}_cpu_*_N() definitions and the visiual inconsistency was
  making following the code unnecessarily difficult.

* In include/linux/percpu-defs.h, move __verify_pcpu_ptr() later in
  the file so that it's right above accessor definitions where it's
  actually used.

This is pure reorganization.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
This commit is contained in:
Tejun Heo 2014-06-17 19:12:39 -04:00
parent a32f8d8eda
commit 9c28278a24
2 changed files with 112 additions and 112 deletions
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198
include/asm-generic/percpu.h
View File

@ -65,6 +65,105 @@ extern void setup_per_cpu_areas(void);
#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
@ -78,11 +177,6 @@ extern void setup_per_cpu_areas(void);
# define raw_cpu_read_8(pcp) (*raw_cpu_ptr(&(pcp)))
# endif
#define raw_cpu_generic_to_op(pcp, val, op) \
do { \
*raw_cpu_ptr(&(pcp)) op val; \
} while (0)
# ifndef raw_cpu_write_1
# define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), =)
# endif
@ -135,12 +229,6 @@ do { \
# define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=)
# endif
#define raw_cpu_generic_add_return(pcp, val) \
({ \
raw_cpu_add(pcp, val); \
raw_cpu_read(pcp); \
})
# ifndef raw_cpu_add_return_1
# define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val)
# endif
@ -154,13 +242,6 @@ do { \
# define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val)
# endif
#define raw_cpu_generic_xchg(pcp, nval) \
({ typeof(pcp) ret__; \
ret__ = raw_cpu_read(pcp); \
raw_cpu_write(pcp, nval); \
ret__; \
})
# ifndef raw_cpu_xchg_1
# define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
# endif
@ -174,15 +255,6 @@ do { \
# define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval)
# endif
#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__; \
})
# ifndef raw_cpu_cmpxchg_1
# define raw_cpu_cmpxchg_1(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval)
# endif
@ -196,18 +268,6 @@ do { \
# define raw_cpu_cmpxchg_8(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval)
# endif
#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); \
})
# 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)
@ -225,14 +285,6 @@ do { \
raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
# endif
#define _this_cpu_generic_read(pcp) \
({ typeof(pcp) ret__; \
preempt_disable(); \
ret__ = *this_cpu_ptr(&(pcp)); \
preempt_enable(); \
ret__; \
})
# ifndef this_cpu_read_1
# define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp)
# endif
@ -246,14 +298,6 @@ do { \
# define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp)
# endif
#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)
# ifndef this_cpu_write_1
# define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =)
# endif
@ -306,17 +350,6 @@ do { \
# define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=)
# endif
#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__; \
})
# ifndef this_cpu_add_return_1
# define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val)
# endif
@ -330,16 +363,6 @@ do { \
# define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val)
# endif
#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__; \
})
# ifndef this_cpu_xchg_1
# define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
# endif
@ -353,18 +376,6 @@ do { \
# define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval)
# endif
#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__; \
})
# ifndef this_cpu_cmpxchg_1
# define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
# endif
@ -378,17 +389,6 @@ do { \
# define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval)
# endif
#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 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)

26
include/linux/percpu-defs.h
View File

@ -52,19 +52,6 @@
#define __PCPU_DUMMY_ATTRS \
__attribute__((section(".discard"), unused))
/*
* Macro which verifies @ptr is a percpu pointer without evaluating
* @ptr. This is to be used in percpu accessors to verify that the
* input parameter is a percpu pointer.
*
* + 0 is required in order to convert the pointer type from a
* potential array type to a pointer to a single item of the array.
*/
#define __verify_pcpu_ptr(ptr) do { \
const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
(void)__vpp_verify; \
} while (0)
/*
* s390 and alpha modules require percpu variables to be defined as
* weak to force the compiler to generate GOT based external
@ -203,6 +190,19 @@
*/
#ifndef __ASSEMBLY__
/*
* Macro which verifies @ptr is a percpu pointer without evaluating
* @ptr. This is to be used in percpu accessors to verify that the
* input parameter is a percpu pointer.
*
* + 0 is required in order to convert the pointer type from a
* potential array type to a pointer to a single item of the array.
*/
#define __verify_pcpu_ptr(ptr) do { \
const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
(void)__vpp_verify; \
} while (0)
#ifdef CONFIG_SMP
/*