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Commit cadb1c4d authored by Tejun Heo's avatar Tejun Heo
Browse files

percpu: use raw_cpu_*() to define __this_cpu_*() 



__this_cpu_*() operations are the same as raw_cpu_*() operations
except for the added __this_cpu_preempt_check().  Curiously, these
were defined using __pcu_size_call_*() instead of being layered on top
of raw_cpu_*().

Let's layer them so that __this_cpu_*() are defined in terms of
raw_cpu_*().  It's simpler and less error-prone this way.

This patch doesn't introduce any functional difference.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarChristoph Lameter <cl@linux.com>
parent 9c28278a

include/linux/percpu-defs.h

+9 −9
Original line number Diff line number Diff line
@@ -403,16 +403,16 @@ do { \ 
 * Generic percpu operations for context that are safe from preemption/interrupts.

 */

# define __this_cpu_read(pcp) \

	(__this_cpu_preempt_check("read"),__pcpu_size_call_return(raw_cpu_read_, (pcp)))

	(__this_cpu_preempt_check("read"),raw_cpu_read(pcp))



# define __this_cpu_write(pcp, val)					\

do { __this_cpu_preempt_check("write");					\

     __pcpu_size_call(raw_cpu_write_, (pcp), (val));			\

     raw_cpu_write(pcp, val);						\

} while (0)



# define __this_cpu_add(pcp, val)					 \

do { __this_cpu_preempt_check("add");					\

	__pcpu_size_call(raw_cpu_add_, (pcp), (val));			\

	raw_cpu_add(pcp, val);						\

} while (0)



# define __this_cpu_sub(pcp, val)	__this_cpu_add((pcp), -(typeof(pcp))(val))
@@ -421,29 +421,29 @@ do { __this_cpu_preempt_check("add"); \ 


# define __this_cpu_and(pcp, val)					\

do { __this_cpu_preempt_check("and");					\

	__pcpu_size_call(raw_cpu_and_, (pcp), (val));			\

	raw_cpu_and(pcp, val);						\

} while (0)



# define __this_cpu_or(pcp, val)					\

do { __this_cpu_preempt_check("or");					\

	__pcpu_size_call(raw_cpu_or_, (pcp), (val));			\

	raw_cpu_or(pcp, val);						\

} while (0)



# define __this_cpu_add_return(pcp, val)	\

	(__this_cpu_preempt_check("add_return"),__pcpu_size_call_return2(raw_cpu_add_return_, pcp, val))

	(__this_cpu_preempt_check("add_return"),raw_cpu_add_return(pcp, val))



#define __this_cpu_sub_return(pcp, val)	__this_cpu_add_return(pcp, -(typeof(pcp))(val))

#define __this_cpu_inc_return(pcp)	__this_cpu_add_return(pcp, 1)

#define __this_cpu_dec_return(pcp)	__this_cpu_add_return(pcp, -1)



# define __this_cpu_xchg(pcp, nval)	\

	(__this_cpu_preempt_check("xchg"),__pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval))

	(__this_cpu_preempt_check("xchg"),raw_cpu_xchg(pcp, nval))



# define __this_cpu_cmpxchg(pcp, oval, nval)	\

	(__this_cpu_preempt_check("cmpxchg"),__pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval))

	(__this_cpu_preempt_check("cmpxchg"),raw_cpu_cmpxchg(pcp, oval, nval))



# define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)	\

	(__this_cpu_preempt_check("cmpxchg_double"),__pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)))

	(__this_cpu_preempt_check("cmpxchg_double"),raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2))



/*

 * this_cpu_*() operations are used for accesses that must be done in a