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#ifndef _LINUX_PERCPU_UBUNTU_H
#define _LINUX_PERCPU_UBUNTU_H
#include <asm/percpu.h>
/*
* Branching function to split up a function into a set of functions that
* are called for different scalar sizes of the objects handled.
*/
extern void __bad_size_call_parameter(void);
#define __pcpu_size_call_return(stem, variable) \
({ typeof(variable) pscr_ret__; \
__verify_pcpu_ptr(&(variable)); \
switch(sizeof(variable)) { \
case 1: pscr_ret__ = stem##1(variable);break; \
case 2: pscr_ret__ = stem##2(variable);break; \
case 4: pscr_ret__ = stem##4(variable);break; \
case 8: pscr_ret__ = stem##8(variable);break; \
default: \
__bad_size_call_parameter();break; \
} \
pscr_ret__; \
})
/*
* Special handling for cmpxchg_double. cmpxchg_double is passed two
* percpu variables. The first has to be aligned to a double word
* boundary and the second has to follow directly thereafter.
* We enforce this on all architectures even if they don't support
* a double cmpxchg instruction, since it's a cheap requirement, and it
* avoids breaking the requirement for architectures with the instruction.
*/
#define __pcpu_size_call(stem, variable, ...) \
do { \
__verify_pcpu_ptr(&(variable)); \
switch(sizeof(variable)) { \
case 1: stem##1(variable, __VA_ARGS__);break; \
case 2: stem##2(variable, __VA_ARGS__);break; \
case 4: stem##4(variable, __VA_ARGS__);break; \
case 8: stem##8(variable, __VA_ARGS__);break; \
default: \
__bad_size_call_parameter();break; \
} \
} while (0)
/*
* Generic percpu operations for context that are safe from preemption/interrupts.
* Either we do not care about races or the caller has the
* responsibility of handling preemption/interrupt issues. Arch code can still
* override these instructions since the arch per cpu code may be more
* efficient and may actually get race freeness for free (that is the
* case for x86 for example).
*
* If there is no other protection through preempt disable and/or
* disabling interupts then one of these RMW operations can show unexpected
* behavior because the execution thread was rescheduled on another processor
* or an interrupt occurred and the same percpu variable was modified from
* the interrupt context.
*/
#ifndef __this_cpu_read
# ifndef __this_cpu_read_1
# define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp)))
# endif
# ifndef __this_cpu_read_2
# define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp)))
# endif
# ifndef __this_cpu_read_4
# define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp)))
# endif
# ifndef __this_cpu_read_8
# define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp)))
# endif
# define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp))
#endif
#define __this_cpu_generic_to_op(pcp, val, op) \
do { \
*__this_cpu_ptr(&(pcp)) op val; \
} while (0)
#ifndef __this_cpu_write
# 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
# define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val))
#endif
#endif /* _LINUX_PERCPU_UBUNTU_H */