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    Subject[ 30/30] sparc32: support atomic64_t
    Date
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Sam Ravnborg <sam@ravnborg.org>

    commit aea1181b0bd0a09c54546399768f359d1e198e45 upstream, Needed to
    compile ext4 for sparc32 since commit
    503f4bdcc078e7abee273a85ce322de81b18a224

    There is no-one that really require atomic64_t support on sparc32.
    But several drivers fails to build without proper atomic64 support.
    And for an allyesconfig build for sparc32 this is annoying.

    Include the generic atomic64_t support for sparc32.
    This has a text footprint cost:

    $size vmlinux (before atomic64_t support)
    text data bss dec hex filename
    3578860 134260 108781 3821901 3a514d vmlinux

    $size vmlinux (after atomic64_t support)
    text data bss dec hex filename
    3579892 130684 108781 3819357 3a475d vmlinux

    text increase (3579892 - 3578860) = 1032 bytes

    data decreases - but I fail to explain why!
    I have rebuild twice to check my numbers.

    Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Andreas Larsson <andreas@gaisler.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/sparc/Kconfig | 1 +
    arch/sparc/include/asm/atomic_32.h | 2 ++
    2 files changed, 3 insertions(+)

    --- a/arch/sparc/Kconfig
    +++ b/arch/sparc/Kconfig
    @@ -31,6 +31,7 @@ config SPARC

    config SPARC32
    def_bool !64BIT
    + select GENERIC_ATOMIC64

    config SPARC64
    def_bool 64BIT
    --- a/arch/sparc/include/asm/atomic_32.h
    +++ b/arch/sparc/include/asm/atomic_32.h
    @@ -15,6 +15,8 @@

    #ifdef __KERNEL__

    +#include <asm-generic/atomic64.h>
    +
    #include <asm/system.h>

    #define ATOMIC_INIT(i) { (i) }



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