let LOG_BUF_SHIFT default to 17

[linux-2.6] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 074ac97f55e32a505ea3479ba85d0c3c619ac9e6..e037a5a22b468a47f331f2d5bd5bce957e3f76e6 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -259,17 +259,14 @@ config IKCONFIG_PROC
 config LOG_BUF_SHIFT
        int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
        range 12 21
-       default 17 if S390 || LOCKDEP
-       default 16 if X86_NUMAQ || IA64
-       default 15 if SMP
-       default 14
+       default 17
        help
          Select kernel log buffer size as a power of 2.
-         Defaults and Examples:
-                    17 => 128 KB for S/390
-                    16 => 64 KB for x86 NUMAQ or IA-64
-                    15 => 32 KB for SMP
-                    14 => 16 KB for uniprocessor
+         Examples:
+                    17 => 128 KB
+                    16 => 64 KB
+                    15 => 32 KB
+                    14 => 16 KB
                     13 =>  8 KB
                     12 =>  4 KB
 
@@ -328,6 +325,13 @@ config RT_GROUP_SCHED
        depends on EXPERIMENTAL
        depends on GROUP_SCHED
        default n
+       help
+         This feature lets you explicitly allocate real CPU bandwidth
+         to users or control groups (depending on the "Basis for grouping tasks"
+         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.
 
 choice
        depends on GROUP_SCHED
@@ -489,16 +493,12 @@ source "usr/Kconfig"
 endif
 
 config CC_OPTIMIZE_FOR_SIZE
-       bool "Optimize for size (Look out for broken compilers!)"
+       bool "Optimize for size"
        default y
-       depends on ARM || H8300 || SUPERH || EXPERIMENTAL
        help
          Enabling this option will pass "-Os" instead of "-O2" to gcc
          resulting in a smaller kernel.
 
-         WARNING: some versions of gcc may generate incorrect code with this
-         option.  If problems are observed, a gcc upgrade may be needed.
-
          If unsure, say N.
 
 config SYSCTL
@@ -514,7 +514,7 @@ menuconfig EMBEDDED
 
 config UID16
        bool "Enable 16-bit UID system calls" if EMBEDDED
-       depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
+       depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
        default y
        help
          This enables the legacy 16-bit UID syscall wrappers.
@@ -763,7 +763,7 @@ endmenu             # General setup
 config SLABINFO
        bool
        depends on PROC_FS
-       depends on SLAB || SLUB
+       depends on SLAB || SLUB_DEBUG
        default y
 
 config RT_MUTEXES
@@ -865,38 +865,10 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
        bool
 
-choice
-       prompt "RCU implementation type:"
-       default CLASSIC_RCU
-       help
-         This allows you to choose either the classic RCU implementation
-         that is designed for best read-side performance on non-realtime
-         systems, or the preemptible RCU implementation for best latency
-         on realtime systems.  Note that some kernel preemption modes
-         will restrict your choice.
-
-         Select the default if you are unsure.
-
 config CLASSIC_RCU
-       bool "Classic RCU"
+       def_bool !PREEMPT_RCU
        help
          This option selects the classic RCU implementation that is
          designed for best read-side performance on non-realtime
-         systems.
-
-         Say Y if you are unsure.
-
-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.
-
-         Say N if you are unsure.
-
-endchoice
+         systems.  Classic RCU is the default.  Note that the
+         PREEMPT_RCU symbol is used to select/deselect this option.