/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PERCPU_H
#define _ASM_X86_PERCPU_H

#ifdef CONFIG_X86_64
# define __percpu_seg           gs
# define __percpu_rel           (%rip)
#else
# define __percpu_seg           fs
# define __percpu_rel
#endif

#ifdef __ASSEMBLER__

#ifdef CONFIG_SMP
# define __percpu               %__percpu_seg:
#else
# define __percpu
#endif

#define PER_CPU_VAR(var)        __percpu(var)__percpu_rel

#else /* !__ASSEMBLER__: */

#include <linux/args.h>
#include <linux/bits.h>
#include <linux/build_bug.h>
#include <linux/stringify.h>
#include <asm/asm.h>

#ifdef CONFIG_SMP

#define __force_percpu_prefix   "%%"__stringify(__percpu_seg)":"

#ifdef CONFIG_CC_HAS_NAMED_AS

#ifdef __CHECKER__
# define __seg_gs               __attribute__((address_space(__seg_gs)))
# define __seg_fs               __attribute__((address_space(__seg_fs)))
#endif

#define __percpu_prefix
#define __percpu_seg_override   CONCATENATE(__seg_, __percpu_seg)

#else /* !CONFIG_CC_HAS_NAMED_AS: */

#define __percpu_prefix         __force_percpu_prefix
#define __percpu_seg_override

#endif /* CONFIG_CC_HAS_NAMED_AS */

/*
 * Compared to the generic __my_cpu_offset version, the following
 * saves one instruction and avoids clobbering a temp register.
 */
#define __my_cpu_offset         this_cpu_read(this_cpu_off)

/*
 * arch_raw_cpu_ptr should not be used in 32-bit VDSO for a 64-bit
 * kernel, because games are played with CONFIG_X86_64 there and
 * sizeof(this_cpu_off) becames 4.
 */
#ifndef BUILD_VDSO32_64
#define arch_raw_cpu_ptr(_ptr)                                          \
({                                                                      \
        unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off);      \
                                                                        \
        tcp_ptr__ += (__force unsigned long)(_ptr);                     \
        (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__;           \
})
#else
#define arch_raw_cpu_ptr(_ptr)                                          \
({                                                                      \
        BUILD_BUG();                                                    \
        (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)0;                   \
})
#endif

#define PER_CPU_VAR(var)        %__percpu_seg:(var)__percpu_rel

#else /* !CONFIG_SMP: */

#define __force_percpu_prefix
#define __percpu_prefix
#define __percpu_seg_override

#define PER_CPU_VAR(var)        (var)__percpu_rel

#endif /* CONFIG_SMP */

#if defined(CONFIG_USE_X86_SEG_SUPPORT) && defined(USE_TYPEOF_UNQUAL)
# define __my_cpu_type(var)     typeof(var)
# define __my_cpu_ptr(ptr)      (ptr)
# define __my_cpu_var(var)      (var)

# define __percpu_qual          __percpu_seg_override
#else
# define __my_cpu_type(var)     typeof(var) __percpu_seg_override
# define __my_cpu_ptr(ptr)      (__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr)
# define __my_cpu_var(var)      (*__my_cpu_ptr(&(var)))
#endif

#define __force_percpu_arg(x)   __force_percpu_prefix "%" #x
#define __percpu_arg(x)         __percpu_prefix "%" #x

/*
 * For arch-specific code, we can use direct single-insn ops (they
 * don't give an lvalue though).
 */

#define __pcpu_type_1           u8
#define __pcpu_type_2           u16
#define __pcpu_type_4           u32
#define __pcpu_type_8           u64

#define __pcpu_cast_1(val)      ((u8)(((unsigned long) val) & 0xff))
#define __pcpu_cast_2(val)      ((u16)(((unsigned long) val) & 0xffff))
#define __pcpu_cast_4(val)      ((u32)(((unsigned long) val) & 0xffffffff))
#define __pcpu_cast_8(val)      ((u64)(val))

#define __pcpu_op_1(op)         op "b "
#define __pcpu_op_2(op)         op "w "
#define __pcpu_op_4(op)         op "l "
#define __pcpu_op_8(op)         op "q "

#define __pcpu_reg_1(mod, x)    mod "q" (x)
#define __pcpu_reg_2(mod, x)    mod "r" (x)
#define __pcpu_reg_4(mod, x)    mod "r" (x)
#define __pcpu_reg_8(mod, x)    mod "r" (x)

#define __pcpu_reg_imm_1(x)     "qi" (x)
#define __pcpu_reg_imm_2(x)     "ri" (x)
#define __pcpu_reg_imm_4(x)     "ri" (x)
#define __pcpu_reg_imm_8(x)     "re" (x)

#ifdef CONFIG_USE_X86_SEG_SUPPORT

#define __raw_cpu_read(size, qual, pcp)                                 \
({                                                                      \
        *(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp));       \
})

#define __raw_cpu_write(size, qual, pcp, val)                                   \
do {                                                                            \
        *(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp)) = (val);       \
} while (0)

#define __raw_cpu_read_const(pcp)       __raw_cpu_read(, , pcp)

#else /* !CONFIG_USE_X86_SEG_SUPPORT: */

#define __raw_cpu_read(size, qual, _var)                                \
({                                                                      \
        __pcpu_type_##size pfo_val__;                                   \
                                                                        \
        asm qual (__pcpu_op_##size("mov")                               \
                  __percpu_arg([var]) ", %[val]"                        \
            : [val] __pcpu_reg_##size("=", pfo_val__)                   \
            : [var] "m" (__my_cpu_var(_var)));                          \
                                                                        \
        (typeof(_var))(unsigned long) pfo_val__;                        \
})

#define __raw_cpu_write(size, qual, _var, _val)                         \
do {                                                                    \
        __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val);        \
                                                                        \
        if (0) {                                                        \
                TYPEOF_UNQUAL(_var) pto_tmp__;                          \
                pto_tmp__ = (_val);                                     \
                (void)pto_tmp__;                                        \
        }                                                               \
        asm qual (__pcpu_op_##size("mov") "%[val], "                    \
                  __percpu_arg([var])                                   \
            : [var] "=m" (__my_cpu_var(_var))                           \
            : [val] __pcpu_reg_imm_##size(pto_val__));                  \
} while (0)

/*
 * The generic per-CPU infrastrucutre is not suitable for
 * reading const-qualified variables.
 */
#define __raw_cpu_read_const(pcp)       ({ BUILD_BUG(); (typeof(pcp))0; })

#endif /* CONFIG_USE_X86_SEG_SUPPORT */

#define __raw_cpu_read_stable(size, _var)                               \
({                                                                      \
        __pcpu_type_##size pfo_val__;                                   \
                                                                        \
        asm(__pcpu_op_##size("mov")                                     \
            __force_percpu_arg(a[var]) ", %[val]"                       \
            : [val] __pcpu_reg_##size("=", pfo_val__)                   \
            : [var] "i" (&(_var)));                                     \
                                                                        \
        (typeof(_var))(unsigned long) pfo_val__;                        \
})

#define percpu_unary_op(size, qual, op, _var)                           \
({                                                                      \
        asm qual (__pcpu_op_##size(op) __percpu_arg([var])              \
            : [var] "+m" (__my_cpu_var(_var)));                         \
})

#define percpu_binary_op(size, qual, op, _var, _val)                    \
do {                                                                    \
        __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val);        \
                                                                        \
        if (0) {                                                        \
                TYPEOF_UNQUAL(_var) pto_tmp__;                          \
                pto_tmp__ = (_val);                                     \
                (void)pto_tmp__;                                        \
        }                                                               \
        asm qual (__pcpu_op_##size(op) "%[val], " __percpu_arg([var])   \
            : [var] "+m" (__my_cpu_var(_var))                           \
            : [val] __pcpu_reg_imm_##size(pto_val__));                  \
} while (0)

/*
 * Generate a per-CPU add to memory instruction and optimize code
 * if one is added or subtracted.
 */
#define percpu_add_op(size, qual, var, val)                             \
do {                                                                    \
        const int pao_ID__ =                                            \
                (__builtin_constant_p(val) &&                           \
                        ((val) == 1 ||                                  \
                         (val) == (typeof(val))-1)) ? (int)(val) : 0;   \
                                                                        \
        if (0) {                                                        \
                TYPEOF_UNQUAL(var) pao_tmp__;                           \
                pao_tmp__ = (val);                                      \
                (void)pao_tmp__;                                        \
        }                                                               \
        if (pao_ID__ == 1)                                              \
                percpu_unary_op(size, qual, "inc", var);                \
        else if (pao_ID__ == -1)                                        \
                percpu_unary_op(size, qual, "dec", var);                \
        else                                                            \
                percpu_binary_op(size, qual, "add", var, val);          \
} while (0)

/*
 * Add return operation
 */
#define percpu_add_return_op(size, qual, _var, _val)                    \
({                                                                      \
        __pcpu_type_##size paro_tmp__ = __pcpu_cast_##size(_val);       \
                                                                        \
        asm qual (__pcpu_op_##size("xadd") "%[tmp], "                   \
                  __percpu_arg([var])                                   \
                  : [tmp] __pcpu_reg_##size("+", paro_tmp__),           \
                    [var] "+m" (__my_cpu_var(_var))                     \
                  : : "memory");                                        \
        (typeof(_var))(unsigned long) (paro_tmp__ + _val);              \
})

/*
 * raw_cpu_xchg() can use a load-store since
 * it is not required to be IRQ-safe.
 */
#define raw_percpu_xchg_op(_var, _nval)                                 \
({                                                                      \
        TYPEOF_UNQUAL(_var) pxo_old__ = raw_cpu_read(_var);             \
                                                                        \
        raw_cpu_write(_var, _nval);                                     \
                                                                        \
        pxo_old__;                                                      \
})

/*
 * this_cpu_xchg() is implemented using CMPXCHG without a LOCK prefix.
 * XCHG is expensive due to the implied LOCK prefix. The processor
 * cannot prefetch cachelines if XCHG is used.
 */
#define this_percpu_xchg_op(_var, _nval)                                \
({                                                                      \
        TYPEOF_UNQUAL(_var) pxo_old__ = this_cpu_read(_var);            \
                                                                        \
        do { } while (!this_cpu_try_cmpxchg(_var, &pxo_old__, _nval));  \
                                                                        \
        pxo_old__;                                                      \
})

/*
 * CMPXCHG has no such implied lock semantics as a result it is much
 * more efficient for CPU-local operations.
 */
#define percpu_cmpxchg_op(size, qual, _var, _oval, _nval)               \
({                                                                      \
        __pcpu_type_##size pco_old__ = __pcpu_cast_##size(_oval);       \
        __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval);       \
                                                                        \
        asm qual (__pcpu_op_##size("cmpxchg") "%[nval], "               \
                  __percpu_arg([var])                                   \
                  : [oval] "+a" (pco_old__),                            \
                    [var] "+m" (__my_cpu_var(_var))                     \
                  : [nval] __pcpu_reg_##size(, pco_new__)               \
                  : "memory");                                          \
                                                                        \
        (typeof(_var))(unsigned long) pco_old__;                        \
})

#define percpu_try_cmpxchg_op(size, qual, _var, _ovalp, _nval)          \
({                                                                      \
        bool success;                                                   \
        __pcpu_type_##size *pco_oval__ = (__pcpu_type_##size *)(_ovalp); \
        __pcpu_type_##size pco_old__ = *pco_oval__;                     \
        __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval);       \
                                                                        \
        asm qual (__pcpu_op_##size("cmpxchg") "%[nval], "               \
                  __percpu_arg([var])                                   \
                  : "=@ccz" (success),                                  \
                    [oval] "+a" (pco_old__),                            \
                    [var] "+m" (__my_cpu_var(_var))                     \
                  : [nval] __pcpu_reg_##size(, pco_new__)               \
                  : "memory");                                          \
        if (unlikely(!success))                                         \
                *pco_oval__ = pco_old__;                                \
                                                                        \
        likely(success);                                                \
})

#if defined(CONFIG_X86_32) && !defined(CONFIG_UML)

#define percpu_cmpxchg64_op(size, qual, _var, _oval, _nval)             \
({                                                                      \
        union {                                                         \
                u64 var;                                                \
                struct {                                                \
                        u32 low, high;                                  \
                };                                                      \
        } old__, new__;                                                 \
                                                                        \
        old__.var = _oval;                                              \
        new__.var = _nval;                                              \
                                                                        \
        asm_inline qual (                                               \
                ALTERNATIVE("call this_cpu_cmpxchg8b_emu",              \
                            "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
                : ALT_OUTPUT_SP([var] "+m" (__my_cpu_var(_var)),        \
                                "+a" (old__.low), "+d" (old__.high))    \
                : "b" (new__.low), "c" (new__.high),                    \
                  "S" (&(_var))                                         \
                : "memory");                                            \
                                                                        \
        old__.var;                                                      \
})

#define raw_cpu_cmpxchg64(pcp, oval, nval)              percpu_cmpxchg64_op(8,         , pcp, oval, nval)
#define this_cpu_cmpxchg64(pcp, oval, nval)             percpu_cmpxchg64_op(8, volatile, pcp, oval, nval)

#define percpu_try_cmpxchg64_op(size, qual, _var, _ovalp, _nval)        \
({                                                                      \
        bool success;                                                   \
        u64 *_oval = (u64 *)(_ovalp);                                   \
        union {                                                         \
                u64 var;                                                \
                struct {                                                \
                        u32 low, high;                                  \
                };                                                      \
        } old__, new__;                                                 \
                                                                        \
        old__.var = *_oval;                                             \
        new__.var = _nval;                                              \
                                                                        \
        asm_inline qual (                                               \
                ALTERNATIVE("call this_cpu_cmpxchg8b_emu",              \
                            "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
                : ALT_OUTPUT_SP("=@ccz" (success),                      \
                                [var] "+m" (__my_cpu_var(_var)),        \
                                "+a" (old__.low), "+d" (old__.high))    \
                : "b" (new__.low), "c" (new__.high),                    \
                  "S" (&(_var))                                         \
                : "memory");                                            \
        if (unlikely(!success))                                         \
                *_oval = old__.var;                                     \
                                                                        \
        likely(success);                                                \
})

#define raw_cpu_try_cmpxchg64(pcp, ovalp, nval)         percpu_try_cmpxchg64_op(8,         , pcp, ovalp, nval)
#define this_cpu_try_cmpxchg64(pcp, ovalp, nval)        percpu_try_cmpxchg64_op(8, volatile, pcp, ovalp, nval)

#endif /* defined(CONFIG_X86_32) && !defined(CONFIG_UML) */

#ifdef CONFIG_X86_64
#define raw_cpu_cmpxchg64(pcp, oval, nval)              percpu_cmpxchg_op(8,         , pcp, oval, nval);
#define this_cpu_cmpxchg64(pcp, oval, nval)             percpu_cmpxchg_op(8, volatile, pcp, oval, nval);

#define raw_cpu_try_cmpxchg64(pcp, ovalp, nval)         percpu_try_cmpxchg_op(8,         , pcp, ovalp, nval);
#define this_cpu_try_cmpxchg64(pcp, ovalp, nval)        percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval);

#define percpu_cmpxchg128_op(size, qual, _var, _oval, _nval)            \
({                                                                      \
        union {                                                         \
                u128 var;                                               \
                struct {                                                \
                        u64 low, high;                                  \
                };                                                      \
        } old__, new__;                                                 \
                                                                        \
        old__.var = _oval;                                              \
        new__.var = _nval;                                              \
                                                                        \
        asm_inline qual (                                               \
                ALTERNATIVE("call this_cpu_cmpxchg16b_emu",             \
                            "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
                : ALT_OUTPUT_SP([var] "+m" (__my_cpu_var(_var)),        \
                                "+a" (old__.low), "+d" (old__.high))    \
                : "b" (new__.low), "c" (new__.high),                    \
                  "S" (&(_var))                                         \
                : "memory");                                            \
                                                                        \
        old__.var;                                                      \
})

#define raw_cpu_cmpxchg128(pcp, oval, nval)             percpu_cmpxchg128_op(16,         , pcp, oval, nval)
#define this_cpu_cmpxchg128(pcp, oval, nval)            percpu_cmpxchg128_op(16, volatile, pcp, oval, nval)

#define percpu_try_cmpxchg128_op(size, qual, _var, _ovalp, _nval)       \
({                                                                      \
        bool success;                                                   \
        u128 *_oval = (u128 *)(_ovalp);                                 \
        union {                                                         \
                u128 var;                                               \
                struct {                                                \
                        u64 low, high;                                  \
                };                                                      \
        } old__, new__;                                                 \
                                                                        \
        old__.var = *_oval;                                             \
        new__.var = _nval;                                              \
                                                                        \
        asm_inline qual (                                               \
                ALTERNATIVE("call this_cpu_cmpxchg16b_emu",             \
                            "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
                : ALT_OUTPUT_SP("=@ccz" (success),                      \
                                [var] "+m" (__my_cpu_var(_var)),        \
                                "+a" (old__.low), "+d" (old__.high))    \
                : "b" (new__.low), "c" (new__.high),                    \
                  "S" (&(_var))                                         \
                : "memory");                                            \
        if (unlikely(!success))                                         \
                *_oval = old__.var;                                     \
                                                                        \
        likely(success);                                                \
})

#define raw_cpu_try_cmpxchg128(pcp, ovalp, nval)        percpu_try_cmpxchg128_op(16,         , pcp, ovalp, nval)
#define this_cpu_try_cmpxchg128(pcp, ovalp, nval)       percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval)

#endif /* CONFIG_X86_64 */

#define raw_cpu_read_1(pcp)                             __raw_cpu_read(1, , pcp)
#define raw_cpu_read_2(pcp)                             __raw_cpu_read(2, , pcp)
#define raw_cpu_read_4(pcp)                             __raw_cpu_read(4, , pcp)
#define raw_cpu_write_1(pcp, val)                       __raw_cpu_write(1, , pcp, val)
#define raw_cpu_write_2(pcp, val)                       __raw_cpu_write(2, , pcp, val)
#define raw_cpu_write_4(pcp, val)                       __raw_cpu_write(4, , pcp, val)

#define this_cpu_read_1(pcp)                            __raw_cpu_read(1, volatile, pcp)
#define this_cpu_read_2(pcp)                            __raw_cpu_read(2, volatile, pcp)
#define this_cpu_read_4(pcp)                            __raw_cpu_read(4, volatile, pcp)
#define this_cpu_write_1(pcp, val)                      __raw_cpu_write(1, volatile, pcp, val)
#define this_cpu_write_2(pcp, val)                      __raw_cpu_write(2, volatile, pcp, val)
#define this_cpu_write_4(pcp, val)                      __raw_cpu_write(4, volatile, pcp, val)

#define this_cpu_read_stable_1(pcp)                     __raw_cpu_read_stable(1, pcp)
#define this_cpu_read_stable_2(pcp)                     __raw_cpu_read_stable(2, pcp)
#define this_cpu_read_stable_4(pcp)                     __raw_cpu_read_stable(4, pcp)

#define raw_cpu_add_1(pcp, val)                         percpu_add_op(1, , (pcp), val)
#define raw_cpu_add_2(pcp, val)                         percpu_add_op(2, , (pcp), val)
#define raw_cpu_add_4(pcp, val)                         percpu_add_op(4, , (pcp), val)
#define raw_cpu_and_1(pcp, val)                         percpu_binary_op(1, , "and", (pcp), val)
#define raw_cpu_and_2(pcp, val)                         percpu_binary_op(2, , "and", (pcp), val)
#define raw_cpu_and_4(pcp, val)                         percpu_binary_op(4, , "and", (pcp), val)
#define raw_cpu_or_1(pcp, val)                          percpu_binary_op(1, , "or", (pcp), val)
#define raw_cpu_or_2(pcp, val)                          percpu_binary_op(2, , "or", (pcp), val)
#define raw_cpu_or_4(pcp, val)                          percpu_binary_op(4, , "or", (pcp), val)
#define raw_cpu_xchg_1(pcp, val)                        raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_2(pcp, val)                        raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val)                        raw_percpu_xchg_op(pcp, val)

#define this_cpu_add_1(pcp, val)                        percpu_add_op(1, volatile, (pcp), val)
#define this_cpu_add_2(pcp, val)                        percpu_add_op(2, volatile, (pcp), val)
#define this_cpu_add_4(pcp, val)                        percpu_add_op(4, volatile, (pcp), val)
#define this_cpu_and_1(pcp, val)                        percpu_binary_op(1, volatile, "and", (pcp), val)
#define this_cpu_and_2(pcp, val)                        percpu_binary_op(2, volatile, "and", (pcp), val)
#define this_cpu_and_4(pcp, val)                        percpu_binary_op(4, volatile, "and", (pcp), val)
#define this_cpu_or_1(pcp, val)                         percpu_binary_op(1, volatile, "or", (pcp), val)
#define this_cpu_or_2(pcp, val)                         percpu_binary_op(2, volatile, "or", (pcp), val)
#define this_cpu_or_4(pcp, val)                         percpu_binary_op(4, volatile, "or", (pcp), val)
#define this_cpu_xchg_1(pcp, nval)                      this_percpu_xchg_op(pcp, nval)
#define this_cpu_xchg_2(pcp, nval)                      this_percpu_xchg_op(pcp, nval)
#define this_cpu_xchg_4(pcp, nval)                      this_percpu_xchg_op(pcp, nval)

#define raw_cpu_add_return_1(pcp, val)                  percpu_add_return_op(1, , pcp, val)
#define raw_cpu_add_return_2(pcp, val)                  percpu_add_return_op(2, , pcp, val)
#define raw_cpu_add_return_4(pcp, val)                  percpu_add_return_op(4, , pcp, val)
#define raw_cpu_cmpxchg_1(pcp, oval, nval)              percpu_cmpxchg_op(1, , pcp, oval, nval)
#define raw_cpu_cmpxchg_2(pcp, oval, nval)              percpu_cmpxchg_op(2, , pcp, oval, nval)
#define raw_cpu_cmpxchg_4(pcp, oval, nval)              percpu_cmpxchg_op(4, , pcp, oval, nval)
#define raw_cpu_try_cmpxchg_1(pcp, ovalp, nval)         percpu_try_cmpxchg_op(1, , pcp, ovalp, nval)
#define raw_cpu_try_cmpxchg_2(pcp, ovalp, nval)         percpu_try_cmpxchg_op(2, , pcp, ovalp, nval)
#define raw_cpu_try_cmpxchg_4(pcp, ovalp, nval)         percpu_try_cmpxchg_op(4, , pcp, ovalp, nval)

#define this_cpu_add_return_1(pcp, val)                 percpu_add_return_op(1, volatile, pcp, val)
#define this_cpu_add_return_2(pcp, val)                 percpu_add_return_op(2, volatile, pcp, val)
#define this_cpu_add_return_4(pcp, val)                 percpu_add_return_op(4, volatile, pcp, val)
#define this_cpu_cmpxchg_1(pcp, oval, nval)             percpu_cmpxchg_op(1, volatile, pcp, oval, nval)
#define this_cpu_cmpxchg_2(pcp, oval, nval)             percpu_cmpxchg_op(2, volatile, pcp, oval, nval)
#define this_cpu_cmpxchg_4(pcp, oval, nval)             percpu_cmpxchg_op(4, volatile, pcp, oval, nval)
#define this_cpu_try_cmpxchg_1(pcp, ovalp, nval)        percpu_try_cmpxchg_op(1, volatile, pcp, ovalp, nval)
#define this_cpu_try_cmpxchg_2(pcp, ovalp, nval)        percpu_try_cmpxchg_op(2, volatile, pcp, ovalp, nval)
#define this_cpu_try_cmpxchg_4(pcp, ovalp, nval)        percpu_try_cmpxchg_op(4, volatile, pcp, ovalp, nval)

/*
 * Per-CPU atomic 64-bit operations are only available under 64-bit kernels.
 * 32-bit kernels must fall back to generic operations.
 */
#ifdef CONFIG_X86_64

#define raw_cpu_read_8(pcp)                             __raw_cpu_read(8, , pcp)
#define raw_cpu_write_8(pcp, val)                       __raw_cpu_write(8, , pcp, val)

#define this_cpu_read_8(pcp)                            __raw_cpu_read(8, volatile, pcp)
#define this_cpu_write_8(pcp, val)                      __raw_cpu_write(8, volatile, pcp, val)

#define this_cpu_read_stable_8(pcp)                     __raw_cpu_read_stable(8, pcp)

#define raw_cpu_add_8(pcp, val)                         percpu_add_op(8, , (pcp), val)
#define raw_cpu_and_8(pcp, val)                         percpu_binary_op(8, , "and", (pcp), val)
#define raw_cpu_or_8(pcp, val)                          percpu_binary_op(8, , "or", (pcp), val)
#define raw_cpu_add_return_8(pcp, val)                  percpu_add_return_op(8, , pcp, val)
#define raw_cpu_xchg_8(pcp, nval)                       raw_percpu_xchg_op(pcp, nval)
#define raw_cpu_cmpxchg_8(pcp, oval, nval)              percpu_cmpxchg_op(8, , pcp, oval, nval)
#define raw_cpu_try_cmpxchg_8(pcp, ovalp, nval)         percpu_try_cmpxchg_op(8, , pcp, ovalp, nval)

#define this_cpu_add_8(pcp, val)                        percpu_add_op(8, volatile, (pcp), val)
#define this_cpu_and_8(pcp, val)                        percpu_binary_op(8, volatile, "and", (pcp), val)
#define this_cpu_or_8(pcp, val)                         percpu_binary_op(8, volatile, "or", (pcp), val)
#define this_cpu_add_return_8(pcp, val)                 percpu_add_return_op(8, volatile, pcp, val)
#define this_cpu_xchg_8(pcp, nval)                      this_percpu_xchg_op(pcp, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval)             percpu_cmpxchg_op(8, volatile, pcp, oval, nval)
#define this_cpu_try_cmpxchg_8(pcp, ovalp, nval)        percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval)

#define raw_cpu_read_long(pcp)                          raw_cpu_read_8(pcp)

#else /* !CONFIG_X86_64: */

/* There is no generic 64-bit read stable operation for 32-bit targets. */
#define this_cpu_read_stable_8(pcp)                     ({ BUILD_BUG(); (typeof(pcp))0; })

#define raw_cpu_read_long(pcp)                          raw_cpu_read_4(pcp)

#endif /* CONFIG_X86_64 */

#define this_cpu_read_const(pcp)                        __raw_cpu_read_const(pcp)

/*
 * this_cpu_read() makes the compiler load the per-CPU variable every time
 * it is accessed while this_cpu_read_stable() allows the value to be cached.
 * this_cpu_read_stable() is more efficient and can be used if its value
 * is guaranteed to be valid across CPUs.  The current users include
 * current_task and cpu_current_top_of_stack, both of which are
 * actually per-thread variables implemented as per-CPU variables and
 * thus stable for the duration of the respective task.
 */
#define this_cpu_read_stable(pcp)                       __pcpu_size_call_return(this_cpu_read_stable_, pcp)

#define x86_this_cpu_constant_test_bit(_nr, _var)                       \
({                                                                      \
        unsigned long __percpu *addr__ =                                \
                (unsigned long __percpu *)&(_var) + BIT_WORD(_nr);      \
                                                                        \
        !!(BIT_MASK(_nr) & raw_cpu_read(*addr__));                      \
})

#define x86_this_cpu_variable_test_bit(_nr, _var)                       \
({                                                                      \
        bool oldbit;                                                    \
                                                                        \
        asm volatile("btl %[nr], " __percpu_arg([var])                  \
                     : "=@ccc" (oldbit)                                 \
                     : [var] "m" (__my_cpu_var(_var)),                  \
                       [nr] "rI" (_nr));                                \
        oldbit;                                                         \
})

#define x86_this_cpu_test_bit(_nr, _var)                                \
        (__builtin_constant_p(_nr)                                      \
         ? x86_this_cpu_constant_test_bit(_nr, _var)                    \
         : x86_this_cpu_variable_test_bit(_nr, _var))


#include <asm-generic/percpu.h>

/* We can use this directly for local CPU (faster). */
DECLARE_PER_CPU_CACHE_HOT(unsigned long, this_cpu_off);

#endif /* !__ASSEMBLER__ */

#ifdef CONFIG_SMP

/*
 * Define the "EARLY_PER_CPU" macros.  These are used for some per_cpu
 * variables that are initialized and accessed before there are per_cpu
 * areas allocated.
 */

#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)                  \
        DEFINE_PER_CPU(_type, _name) = _initvalue;                      \
        __typeof__(_type) _name##_early_map[NR_CPUS] __initdata =       \
                                { [0 ... NR_CPUS-1] = _initvalue };     \
        __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map

#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue)      \
        DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue;          \
        __typeof__(_type) _name##_early_map[NR_CPUS] __initdata =       \
                                { [0 ... NR_CPUS-1] = _initvalue };     \
        __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map

#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)                              \
        EXPORT_PER_CPU_SYMBOL(_name)

#define DECLARE_EARLY_PER_CPU(_type, _name)                             \
        DECLARE_PER_CPU(_type, _name);                                  \
        extern __typeof__(_type) *_name##_early_ptr;                    \
        extern __typeof__(_type)  _name##_early_map[]

#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name)                 \
        DECLARE_PER_CPU_READ_MOSTLY(_type, _name);                      \
        extern __typeof__(_type) *_name##_early_ptr;                    \
        extern __typeof__(_type)  _name##_early_map[]

#define early_per_cpu_ptr(_name)                        (_name##_early_ptr)
#define early_per_cpu_map(_name, _idx)                  (_name##_early_map[_idx])

#define early_per_cpu(_name, _cpu)                                      \
        *(early_per_cpu_ptr(_name) ?                                    \
                &early_per_cpu_ptr(_name)[_cpu] :                       \
                &per_cpu(_name, _cpu))

#else /* !CONFIG_SMP: */
#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)                  \
        DEFINE_PER_CPU(_type, _name) = _initvalue

#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue)      \
        DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue

#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)                              \
        EXPORT_PER_CPU_SYMBOL(_name)

#define DECLARE_EARLY_PER_CPU(_type, _name)                             \
        DECLARE_PER_CPU(_type, _name)

#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name)                 \
        DECLARE_PER_CPU_READ_MOSTLY(_type, _name)

#define early_per_cpu(_name, _cpu)                      per_cpu(_name, _cpu)
#define early_per_cpu_ptr(_name)                        NULL
/* no early_per_cpu_map() */

#endif /* !CONFIG_SMP */

#endif /* _ASM_X86_PERCPU_H */