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    Subject[PATCH] let ERR_PTR BUILD_BUG_ON when we know its argument is not a valid errno
    Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
    Cc: Andrew Morton <akpm@osdl.org>
    ---
    allmodconfig compile tested (on x86_64)

    should be applied after:
    net/sunrpc/xprtrdma: fix svc_rdma_create out of memory error path
    jfs: 0 is not valid errno value
    ---
    include/linux/err.h | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/include/linux/err.h b/include/linux/err.h
    --- a/include/linux/err.h
    +++ b/include/linux/err.h
    @@ -19,11 +19,13 @@

    #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)

    -static inline void *ERR_PTR(long error)
    +static inline void *__ERR_PTR(long error)
    {
    return (void *) error;
    }

    +#define ERR_PTR(error) (BUILD_BUG_ON(!IS_ERR_VALUE(error)), __ERR_PTR(error))
    +
    static inline long PTR_ERR(const void *ptr)
    {
    return (long) ptr;
    --

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