percpu: move {raw|this}_cpu_*() definitions to include/linux/percpu-defs.h

We're in the process of moving all percpu accessors and operations to
include/linux/percpu-defs.h so that they're available to arch headers
without having to include full include/linux/percpu.h which may cause
cyclic inclusion dependency.

This patch moves {raw|this}_cpu_*() definitions from
include/linux/percpu.h to include/linux/percpu-defs.h.  The code is
moved mostly verbatim; however, raw_cpu_*() are placed above
this_cpu_*() which is more conventional as the raw operations may be
used to defined other variants.

This is pure reorganization.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>

1 files changed, 0 insertions, 208 deletions

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 20b953532596..6f61b61b7996 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -129,212 +129,4 @@ extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 #define alloc_percpu(type)      \
         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 
-/*
- * 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);
-
-#ifdef CONFIG_DEBUG_PREEMPT
-extern void __this_cpu_preempt_check(const char *op);
-#else
-static inline void __this_cpu_preempt_check(const char *op) { }
-#endif
-
-#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__;                                                     \
-})
-
-#define __pcpu_size_call_return2(stem, variable, ...)                   \
-({                                                                      \
-        typeof(variable) pscr2_ret__;                                   \
-        __verify_pcpu_ptr(&(variable));                                 \
-        switch(sizeof(variable)) {                                      \
-        case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
-        case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
-        case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
-        case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
-        default:                                                        \
-                __bad_size_call_parameter(); break;                     \
-        }                                                               \
-        pscr2_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_double_call_return_bool(stem, pcp1, pcp2, ...)           \
-({                                                                      \
-        bool pdcrb_ret__;                                               \
-        __verify_pcpu_ptr(&pcp1);                                       \
-        BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
-        VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));         \
-        VM_BUG_ON((unsigned long)(&pcp2) !=                             \
-                  (unsigned long)(&pcp1) + sizeof(pcp1));               \
-        switch(sizeof(pcp1)) {                                          \
-        case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
-        case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
-        case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
-        case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
-        default:                                                        \
-                __bad_size_call_parameter(); break;                     \
-        }                                                               \
-        pdcrb_ret__;                                                    \
-})
-
-#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)
-
-/*
- * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
- *
- * Optimized manipulation for memory allocated through the per cpu
- * allocator or for addresses of per cpu variables.
- *
- * These operation guarantee exclusivity of access for other operations
- * on the *same* processor. The assumption is that per cpu data is only
- * accessed by a single processor instance (the current one).
- *
- * The first group is used for accesses that must be done in a
- * preemption safe way since we know that the context is not preempt
- * safe. Interrupts may occur. If the interrupt modifies the variable
- * too then RMW actions will not be reliable.
- *
- * The arch code can provide optimized implementation by defining macros
- * for certain scalar sizes. F.e. provide this_cpu_add_2() to provide per
- * cpu atomic operations for 2 byte sized RMW actions. If arch code does
- * not provide operations for a scalar size then the fallback in the
- * generic code will be used.
- */
-
-# define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
-# define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
-# define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
-# define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(typeof(pcp))(val))
-# define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
-# define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
-# define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
-# define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
-# define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_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)       \
-        __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
-# define this_cpu_cmpxchg(pcp, oval, nval)      \
-        __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
-
-/*
- * cmpxchg_double replaces two adjacent scalars at once.  The first
- * two parameters are per cpu variables which have to be of the same
- * size.  A truth value is returned to indicate success or failure
- * (since a double register result is difficult to handle).  There is
- * very limited hardware support for these operations, so only certain
- * sizes may work.
- */
-# define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
-        __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
-
-/*
- * Generic percpu operations for contexts where we do not want to do
- * any checks for preemptiosn.
- *
- * 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.
- */
-# define raw_cpu_read(pcp)      __pcpu_size_call_return(raw_cpu_read_, (pcp))
-# define raw_cpu_write(pcp, val)        __pcpu_size_call(raw_cpu_write_, (pcp), (val))
-# define raw_cpu_add(pcp, val)  __pcpu_size_call(raw_cpu_add_, (pcp), (val))
-# define raw_cpu_sub(pcp, val)  raw_cpu_add((pcp), -(val))
-# define raw_cpu_inc(pcp)               raw_cpu_add((pcp), 1)
-# define raw_cpu_dec(pcp)               raw_cpu_sub((pcp), 1)
-# define raw_cpu_and(pcp, val)  __pcpu_size_call(raw_cpu_and_, (pcp), (val))
-# define raw_cpu_or(pcp, val)   __pcpu_size_call(raw_cpu_or_, (pcp), (val))
-# define raw_cpu_add_return(pcp, val)   \
-        __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
-#define raw_cpu_sub_return(pcp, val)    raw_cpu_add_return(pcp, -(typeof(pcp))(val))
-#define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1)
-#define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1)
-# define raw_cpu_xchg(pcp, nval)        \
-        __pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval)
-# define raw_cpu_cmpxchg(pcp, oval, nval)       \
-        __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
-# define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
-        __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
-
-/*
- * 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)))
-
-# define __this_cpu_write(pcp, val)                                     \
-do { __this_cpu_preempt_check("write");                                 \
-     __pcpu_size_call(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));                   \
-} while (0)
-
-# define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(typeof(pcp))(val))
-# define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
-# define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
-
-# define __this_cpu_and(pcp, val)                                       \
-do { __this_cpu_preempt_check("and");                                   \
-        __pcpu_size_call(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));                    \
-} 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))
-
-#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))
-
-# define __this_cpu_cmpxchg(pcp, oval, nval)    \
-        (__this_cpu_preempt_check("cmpxchg"),__pcpu_size_call_return2(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)))
-
 #endif /* __LINUX_PERCPU_H */