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    Subject[PATCH 4.9 39/42] Backport minimal compiler_attributes.h to support GCC 9
    Date
    From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>

    This adds support for __copy to v4.9.y so that we can use it in
    init/exit_module to avoid -Werror=missing-attributes errors on GCC 9.

    Link: https://lore.kernel.org/lkml/259986242.BvXPX32bHu@devpool35/
    Cc: <stable@vger.kernel.org>
    Suggested-by: Rolf Eike Beer <eb@emlix.com>
    Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/compiler.h | 16 ++++++++++++++++
    1 file changed, 16 insertions(+)

    --- a/include/linux/compiler.h
    +++ b/include/linux/compiler.h
    @@ -54,6 +54,22 @@ extern void __chk_io_ptr(const volatile

    #ifdef __KERNEL__

    +/*
    + * Minimal backport of compiler_attributes.h to add support for __copy
    + * to v4.9.y so that we can use it in init/exit_module to avoid
    + * -Werror=missing-attributes errors on GCC 9.
    + */
    +#ifndef __has_attribute
    +# define __has_attribute(x) __GCC4_has_attribute_##x
    +# define __GCC4_has_attribute___copy__ 0
    +#endif
    +
    +#if __has_attribute(__copy__)
    +# define __copy(symbol) __attribute__((__copy__(symbol)))
    +#else
    +# define __copy(symbol)
    +#endif
    +
    #ifdef __GNUC__
    #include <linux/compiler-gcc.h>
    #endif

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