shmem: unify regular and tiny shmem

[safe/jmp/linux-2.6] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 226da27..315a611 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -354,7 +354,7 @@ config RT_GROUP_SCHED
          setting below. If enabled, it will also make it impossible to
          schedule realtime tasks for non-root users until you allocate
          realtime bandwidth for them.
-         See Documentation/sched-rt-group.txt for more information.
+         See Documentation/scheduler/sched-rt-group.txt for more information.
 
 choice
        depends on GROUP_SCHED
@@ -588,6 +588,13 @@ config KALLSYMS_ALL
 
           Say N.
 
+config KALLSYMS_STRIP_GENERATED
+       bool "Strip machine generated symbols from kallsyms"
+       depends on KALLSYMS_ALL
+       default y
+       help
+         Say N if you want kallsyms to retain even machine generated symbols.
+
 config KALLSYMS_EXTRA_PASS
        bool "Do an extra kallsyms pass"
        depends on KALLSYMS
@@ -808,6 +815,7 @@ config TRACEPOINTS
 
 config MARKERS
        bool "Activate markers"
+       depends on TRACEPOINTS
        help
          Place an empty function call at each marker site. Can be
          dynamically changed for a probe function.
@@ -830,10 +838,6 @@ config RT_MUTEXES
        boolean
        select PLIST
 
-config TINY_SHMEM
-       default !SHMEM
-       bool
-
 config BASE_SMALL
        int
        default 0 if BASE_FULL
@@ -908,14 +912,17 @@ config MODULE_SRCVERSION_ALL
          the version).  With this option, such a "srcversion" field
          will be created for all modules.  If unsure, say N.
 
-config KMOD
-       def_bool y
-       help
-         This is being removed soon.  These days, CONFIG_MODULES
-         implies CONFIG_KMOD, so use that instead.
-
 endif # MODULES
 
+config INIT_ALL_POSSIBLE
+       bool
+       help
+         Back when each arch used to define their own cpu_online_map and
+         cpu_possible_map, some of them chose to initialize cpu_possible_map
+         with all 1s, and others with all 0s.  When they were centralised,
+         it was better to provide this option than to break all the archs
+         and have several arch maintainers persuing me down dark alleys.
+
 config STOP_MACHINE
        bool
        default y
@@ -928,10 +935,90 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
        bool
 
+choice
+       prompt "RCU Implementation"
+       default CLASSIC_RCU
+
 config CLASSIC_RCU
-       def_bool !PREEMPT_RCU
+       bool "Classic RCU"
        help
          This option selects the classic RCU implementation that is
          designed for best read-side performance on non-realtime
-         systems.  Classic RCU is the default.  Note that the
-         PREEMPT_RCU symbol is used to select/deselect this option.
+         systems.
+
+         Select this option if you are unsure.
+
+config TREE_RCU
+       bool "Tree-based hierarchical RCU"
+       help
+         This option selects the RCU implementation that is
+         designed for very large SMP system with hundreds or
+         thousands of CPUs.
+
+config PREEMPT_RCU
+       bool "Preemptible RCU"
+       depends on PREEMPT
+       help
+         This option reduces the latency of the kernel by making certain
+         RCU sections preemptible. Normally RCU code is non-preemptible, if
+         this option is selected then read-only RCU sections become
+         preemptible. This helps latency, but may expose bugs due to
+         now-naive assumptions about each RCU read-side critical section
+         remaining on a given CPU through its execution.
+
+endchoice
+
+config RCU_TRACE
+       bool "Enable tracing for RCU"
+       depends on TREE_RCU || PREEMPT_RCU
+       help
+         This option provides tracing in RCU which presents stats
+         in debugfs for debugging RCU implementation.
+
+         Say Y here if you want to enable RCU tracing
+         Say N if you are unsure.
+
+config RCU_FANOUT
+       int "Tree-based hierarchical RCU fanout value"
+       range 2 64 if 64BIT
+       range 2 32 if !64BIT
+       depends on TREE_RCU
+       default 64 if 64BIT
+       default 32 if !64BIT
+       help
+         This option controls the fanout of hierarchical implementations
+         of RCU, allowing RCU to work efficiently on machines with
+         large numbers of CPUs.  This value must be at least the cube
+         root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
+         systems and up to 262,144 for 64-bit systems.
+
+         Select a specific number if testing RCU itself.
+         Take the default if unsure.
+
+config RCU_FANOUT_EXACT
+       bool "Disable tree-based hierarchical RCU auto-balancing"
+       depends on TREE_RCU
+       default n
+       help
+         This option forces use of the exact RCU_FANOUT value specified,
+         regardless of imbalances in the hierarchy.  This is useful for
+         testing RCU itself, and might one day be useful on systems with
+         strong NUMA behavior.
+
+         Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
+
+         Say N if unsure.
+
+config TREE_RCU_TRACE
+       def_bool RCU_TRACE && TREE_RCU
+       select DEBUG_FS
+       help
+         This option provides tracing for the TREE_RCU implementation,
+         permitting Makefile to trivially select kernel/rcutree_trace.c.
+
+config PREEMPT_RCU_TRACE
+       def_bool RCU_TRACE && PREEMPT_RCU
+       select DEBUG_FS
+       help
+         This option provides tracing for the PREEMPT_RCU implementation,
+         permitting Makefile to trivially select kernel/rcupreempt_trace.c.