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    Subject[PATCH 3/3] rcu: Drive configuration directly from SMP and PREEMPT
    Date
    From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    This commit eliminates the possibility of running TREE_PREEMPT_RCU
    when SMP=n and of running TINY_RCU when PREEMPT=y. People who really
    want these combinations can hand-edit init/Kconfig, but eliminating
    them as choices for production systems reduces the amount of testing
    required. It will also allow cutting out a few #ifdefs.

    Note that running TREE_RCU and TINY_RCU on single-CPU systems using
    SMP-built kernels is still supported.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    commit 8008e129dc90ff4f7a56cb033d6bd042afe3ed52 upstream
    Cherry-picked for v3.0-rt and fixed-up merge conflicts
    Note: This makes the depends lines for these options in init/Kconfig for v3.0-rt
    match those for v3.2-rc2-rt3
    Signed-off-by: John Kacur <jkacur@redhat.com>
    ---
    init/Kconfig | 6 +++---
    1 files changed, 3 insertions(+), 3 deletions(-)

    diff --git a/init/Kconfig b/init/Kconfig
    index 89e40a4..5c1147e 100644
    --- a/init/Kconfig
    +++ b/init/Kconfig
    @@ -391,7 +391,7 @@ config TREE_RCU

    config TREE_PREEMPT_RCU
    bool "Preemptible tree-based hierarchical RCU"
    - depends on PREEMPT
    + depends on PREEMPT && SMP
    help
    This option selects the RCU implementation that is
    designed for very large SMP systems with hundreds or
    @@ -401,7 +401,7 @@ config TREE_PREEMPT_RCU

    config TINY_RCU
    bool "UP-only small-memory-footprint RCU"
    - depends on !SMP && !PREEMPT_RT_FULL
    + depends on !PREEMPT && !SMP
    help
    This option selects the RCU implementation that is
    designed for UP systems from which real-time response
    @@ -410,7 +410,7 @@ config TINY_RCU

    config TINY_PREEMPT_RCU
    bool "Preemptible UP-only small-memory-footprint RCU"
    - depends on !SMP && PREEMPT && !PREEMPT_RT_FULL
    + depends on PREEMPT && !SMP
    help
    This option selects the RCU implementation that is designed
    for real-time UP systems. This option greatly reduces the
    --
    1.7.2.3


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