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    Subject[PATCH 02/10] percpu: Move arch XX_PER_CPU_XX definitions into linux/percpu.h
    V1->V2:
    - Special consideration for IA64: Add the ability to specify
    arch specific per cpu flags

    The arch definitions are all the same. So move them into linux/percpu.h.

    We cannot move DECLARE_PER_CPU since some include files just include
    asm/percpu.h to avoid include recursion problems.

    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Cc: Andi Kleen <ak@suse.de>
    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    Signed-off-by: Mike Travis <travis@sgi.com>

    ---
    include/asm-generic/percpu.h | 18 ------------------
    include/asm-ia64/percpu.h | 24 ++----------------------
    include/asm-powerpc/percpu.h | 17 -----------------
    include/asm-s390/percpu.h | 18 ------------------
    include/asm-sparc64/percpu.h | 16 ----------------
    include/asm-x86/percpu_32.h | 12 ------------
    include/asm-x86/percpu_64.h | 17 -----------------
    include/linux/percpu.h | 21 +++++++++++++++++++++
    8 files changed, 23 insertions(+), 120 deletions(-)

    --- a/include/asm-generic/percpu.h
    +++ b/include/asm-generic/percpu.h
    @@ -9,15 +9,6 @@ extern unsigned long __per_cpu_offset[NR

    #define per_cpu_offset(x) (__per_cpu_offset[x])

    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -
    /* var is in discarded region: offset to particular copy we want */
    #define per_cpu(var, cpu) (*({ \
    extern int simple_identifier_##var(void); \
    @@ -27,12 +18,6 @@ extern unsigned long __per_cpu_offset[NR

    #else /* ! SMP */

    -#define DEFINE_PER_CPU(type, name) \
    - __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)
    -
    #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
    #define __get_cpu_var(var) per_cpu__##var
    #define __raw_get_cpu_var(var) per_cpu__##var
    @@ -41,7 +26,4 @@ extern unsigned long __per_cpu_offset[NR

    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    #endif /* _ASM_GENERIC_PERCPU_H_ */
    --- a/include/asm-ia64/percpu.h
    +++ b/include/asm-ia64/percpu.h
    @@ -16,28 +16,11 @@
    #include <linux/threads.h>

    #ifdef HAVE_MODEL_SMALL_ATTRIBUTE
    -# define __SMALL_ADDR_AREA __attribute__((__model__ (__small__)))
    -#else
    -# define __SMALL_ADDR_AREA
    +# define PER_CPU_ATTRIBUTES __attribute__((__model__ (__small__)))
    #endif

    #define DECLARE_PER_CPU(type, name) \
    - extern __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name
    -
    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) \
    - __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name
    -
    -#ifdef CONFIG_SMP
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -#else
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)
    -#endif
    + extern PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name

    #ifdef CONFIG_SMP

    @@ -63,9 +46,6 @@ extern void *per_cpu_init(void);

    #endif /* SMP */

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    /*
    * Be extremely careful when taking the address of this variable! Due to virtual
    * remapping, it is different from the canonical address returned by __get_cpu_var(var)!
    --- a/include/asm-powerpc/percpu.h
    +++ b/include/asm-powerpc/percpu.h
    @@ -16,15 +16,6 @@
    #define __my_cpu_offset() get_paca()->data_offset
    #define per_cpu_offset(x) (__per_cpu_offset(x))

    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -
    /* var is in discarded region: offset to particular copy we want */
    #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
    #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
    @@ -34,11 +25,6 @@ extern void setup_per_cpu_areas(void);

    #else /* ! SMP */

    -#define DEFINE_PER_CPU(type, name) \
    - __typeof__(type) per_cpu__##name
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)
    -
    #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
    #define __get_cpu_var(var) per_cpu__##var
    #define __raw_get_cpu_var(var) per_cpu__##var
    @@ -47,9 +33,6 @@ extern void setup_per_cpu_areas(void);

    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    #else
    #include <asm-generic/percpu.h>
    #endif
    --- a/include/asm-s390/percpu.h
    +++ b/include/asm-s390/percpu.h
    @@ -34,16 +34,6 @@

    extern unsigned long __per_cpu_offset[NR_CPUS];

    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) \
    - __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -
    #define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
    #define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
    #define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
    @@ -51,11 +41,6 @@ extern unsigned long __per_cpu_offset[NR

    #else /* ! SMP */

    -#define DEFINE_PER_CPU(type, name) \
    - __typeof__(type) per_cpu__##name
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)
    -
    #define __get_cpu_var(var) __reloc_hide(var,0)
    #define __raw_get_cpu_var(var) __reloc_hide(var,0)
    #define per_cpu(var,cpu) __reloc_hide(var,0)
    @@ -64,7 +49,4 @@ extern unsigned long __per_cpu_offset[NR

    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    #endif /* __ARCH_S390_PERCPU__ */
    --- a/include/asm-sparc64/percpu.h
    +++ b/include/asm-sparc64/percpu.h
    @@ -16,15 +16,6 @@ extern unsigned long __per_cpu_shift;
    (__per_cpu_base + ((unsigned long)(__cpu) << __per_cpu_shift))
    #define per_cpu_offset(x) (__per_cpu_offset(x))

    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -
    /* var is in discarded region: offset to particular copy we want */
    #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
    #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_cpu_offset))
    @@ -33,10 +24,6 @@ extern unsigned long __per_cpu_shift;
    #else /* ! SMP */

    #define real_setup_per_cpu_areas() do { } while (0)
    -#define DEFINE_PER_CPU(type, name) \
    - __typeof__(type) per_cpu__##name
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)

    #define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var))
    #define __get_cpu_var(var) per_cpu__##var
    @@ -46,7 +33,4 @@ extern unsigned long __per_cpu_shift;

    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    #endif /* __ARCH_SPARC64_PERCPU__ */
    --- a/include/asm-x86/percpu_32.h
    +++ b/include/asm-x86/percpu_32.h
    @@ -47,16 +47,7 @@ extern unsigned long __per_cpu_offset[];

    #define per_cpu_offset(x) (__per_cpu_offset[x])

    -/* Separate out the type, so (int[3], foo) works. */
    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_aligned_in_smp
    -
    /* We can use this directly for local CPU (faster). */
    DECLARE_PER_CPU(unsigned long, this_cpu_off);

    @@ -72,9 +63,6 @@ DECLARE_PER_CPU(unsigned long, this_cpu_

    #define __get_cpu_var(var) __raw_get_cpu_var(var)

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    /* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
    #define __percpu_seg "%%fs:"
    #else /* !SMP */
    --- a/include/asm-x86/percpu_64.h
    +++ b/include/asm-x86/percpu_64.h
    @@ -16,15 +16,6 @@

    #define per_cpu_offset(x) (__per_cpu_offset(x))

    -/* Separate out the type, so (int[3], foo) works. */
    -#define DEFINE_PER_CPU(type, name) \
    - __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
    -
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - __attribute__((__section__(".data.percpu.shared_aligned"))) \
    - __typeof__(type) per_cpu__##name \
    - ____cacheline_internodealigned_in_smp
    -
    /* var is in discarded region: offset to particular copy we want */
    #define per_cpu(var, cpu) (*({ \
    extern int simple_identifier_##var(void); \
    @@ -40,11 +31,6 @@ extern void setup_per_cpu_areas(void);

    #else /* ! SMP */

    -#define DEFINE_PER_CPU(type, name) \
    - __typeof__(type) per_cpu__##name
    -#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    - DEFINE_PER_CPU(type, name)
    -
    #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
    #define __get_cpu_var(var) per_cpu__##var
    #define __raw_get_cpu_var(var) per_cpu__##var
    @@ -53,7 +39,4 @@ extern void setup_per_cpu_areas(void);

    #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

    -#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    -#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    -
    #endif /* _ASM_X8664_PERCPU_H_ */
    --- a/include/linux/percpu.h
    +++ b/include/linux/percpu.h
    @@ -9,6 +9,27 @@

    #include <asm/percpu.h>

    +#ifndef PER_CPU_ATTRIBUTES
    +#define PER_CPU_ATTRIBUTES
    +#endif
    +
    +#define DEFINE_PER_CPU(type, name) \
    + __attribute__((__section__(".data.percpu"))) \
    + PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
    +
    +#ifdef CONFIG_SMP
    +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    + __attribute__((__section__(".data.percpu.shared_aligned"))) \
    + PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name \
    + ____cacheline_aligned_in_smp
    +#else
    +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
    + DEFINE_PER_CPU(type, name)
    +#endif
    +
    +#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
    +#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
    +
    /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
    #ifndef PERCPU_ENOUGH_ROOM
    #ifdef CONFIG_MODULES
    --


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