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    Subject[PATCH] kernel.h: Include <linux/bug.h> to avoid build breakage with ARRAY_SIZE()
    Building imx_v6_v7_defconfig generated the following build error:

    arch/arm/mach-imx/cpu_op-mx51.c: In function 'mx51_get_cpu_op':
    arch/arm/mach-imx/cpu_op-mx51.c:27: error: implicit declaration of function 'BUILD_BUG_ON_ZERO'

    commit 6f863554 (kernel.h: doesn't explicitly use bug.h, so don't include it.)
    has removed asm/debug.h from linux/kernel.h.

    Quoting Russell King (

    "linux/kernel.h _does_ use bug stuff - in ARRAY_SIZE().

    ARRAY_SIZE() uses __must_be_array(), which is defined in linux/compiler-gcc.h,
    which is obtained via linux/compiler.h and linux/linkage.h.

    linux/compiler-gcc.h defines __must_be_array() to be:
    #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

    and BUILD_BUG_ON_ZERO used to be in linux/kernel.h but got moved to

    Hence why people are seeing build breakage with ARRAY_SIZE()."

    Signed-off-by: Fabio Estevam <>
    include/linux/kernel.h | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/include/linux/kernel.h b/include/linux/kernel.h
    index ed9f92e..9c0a86b 100644
    --- a/include/linux/kernel.h
    +++ b/include/linux/kernel.h
    @@ -21,6 +21,7 @@
    #include <linux/typecheck.h>
    #include <linux/printk.h>
    #include <linux/dynamic_debug.h>
    +#include <linux/bug.h>
    #include <asm/byteorder.h>

    #define USHRT_MAX ((u16)(~0U))

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      Last update: 2012-02-28 14:45    [W:0.022 / U:2.552 seconds]
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