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    Subject[PATCH 2/6] ERR_PTR: add ERR_OR_0_PTR
    Date
    Some codepaths call ERR_PTR with possibly 0 argument, which is not
    a valid errno and rely on conversion from 0 to NULL pointer.
    Add ERR_OR_0_PTR function which accepts errnos and 0 as an argument.

    Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    ---
    include/linux/err.h | 7 +++++++
    1 files changed, 7 insertions(+), 0 deletions(-)

    diff --git a/include/linux/err.h b/include/linux/err.h
    index 7b5daa6..cdec8b6 100644
    --- a/include/linux/err.h
    +++ b/include/linux/err.h
    @@ -26,6 +26,13 @@ static inline void *__ERR_PTR(long error)

    #define ERR_PTR(error) (BUILD_BUG_ON(__builtin_constant_p(error) && !IS_ERR_VALUE(error)), __ERR_PTR(error))

    +static inline void *__ERR_OR_0_PTR(long error)
    +{
    + return (void *) error;
    +}
    +
    +#define ERR_OR_0_PTR(error) (BUILD_BUG_ON(__builtin_constant_p(error) && error && !IS_ERR_VALUE(error)), __ERR_OR_0_PTR(error))
    +
    static inline long PTR_ERR(const void *ptr)
    {
    return (long) ptr;
    --
    1.5.4.5


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