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    Subject[PATCH tip/core/rcu 04/14] rcu: Add a gcc-style structure initializer for RCU pointers
    Date
    From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

    RCU_INIT_POINTER() returns a value that is never used, and which should
    be abolished due to terminal ugliness:

    q = RCU_INIT_POINTER(global_p, p);

    However, there are two uses that cannot be handled by a do-while
    formulation because they do gcc-style initialization:

    RCU_INIT_POINTER(.real_cred, &init_cred),
    RCU_INIT_POINTER(.cred, &init_cred),

    This usage is clever, but not necessarily the nicest approach. This
    commit therefore creates an INIT_RCU_POINTER() macro that is specifically
    designed for gcc-style initialization.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    include/linux/rcupdate.h | 8 ++++++++
    1 files changed, 8 insertions(+), 0 deletions(-)

    diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
    index 26d1a47..eb92c21 100644
    --- a/include/linux/rcupdate.h
    +++ b/include/linux/rcupdate.h
    @@ -906,6 +906,14 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
    #define RCU_INIT_POINTER(p, v) \
    p = (typeof(*v) __force __rcu *)(v)

    +/**
    + * INIT_RCU_POINTER() - statically initialize an RCU protected pointer
    + *
    + * GCC-style initialization for an RCU-protected pointer in a structure field.
    + */
    +#define INIT_RCU_POINTER(p, v) \
    + .p = (typeof(*v) __force __rcu *)(v)
    +
    static __always_inline bool __is_kfree_rcu_offset(unsigned long offset)
    {
    return offset < 4096;
    --
    1.7.8


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