X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=init%2FKconfig;h=8b88d0bedcbdeeb7bc08f3592bb3efdb0291c6bd;hb=d34887da6be91eaac1db168fa48d91eaa4504795;hp=448939d183dd1f8aed00f20c2b397d3ca6b00e6b;hpb=804a6a49d874841a98ebea3247ad2e672812ad6a;p=safe%2Fjmp%2Flinux-2.6 diff --git a/init/Kconfig b/init/Kconfig index 448939d..8b88d0b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1,4 +1,13 @@ -menu "Code maturity level options" +config DEFCONFIG_LIST + string + depends on !UML + option defconfig_list + default "/lib/modules/$UNAME_RELEASE/.config" + default "/etc/kernel-config" + default "/boot/config-$UNAME_RELEASE" + default "arch/$ARCH/defconfig" + +menu "General setup" config EXPERIMENTAL bool "Prompt for development and/or incomplete code/drivers" @@ -31,19 +40,8 @@ config EXPERIMENTAL you say Y here, you will be offered the choice of using features or drivers that are currently considered to be in the alpha-test phase. -config CLEAN_COMPILE - bool "Select only drivers expected to compile cleanly" if EXPERIMENTAL - default y - help - Select this option if you don't even want to see the option - to configure known-broken drivers. - - If unsure, say Y - config BROKEN bool - depends on !CLEAN_COMPILE - default y config BROKEN_ON_SMP bool @@ -57,15 +55,12 @@ config LOCK_KERNEL config INIT_ENV_ARG_LIMIT int - default 32 if !USERMODE - default 128 if USERMODE + default 32 if !UML + default 128 if UML help - This is the value of the two limits on the number of argument and of - env.var passed to init from the kernel command line. + Maximum of each of the number of arguments and environment + variables passed to init from the kernel command line. -endmenu - -menu "General setup" config LOCALVERSION string "Local version - append to kernel release" @@ -77,19 +72,38 @@ config LOCALVERSION object and source tree, in that order. Your total string can be a maximum of 64 characters. +config LOCALVERSION_AUTO + bool "Automatically append version information to the version string" + default y + help + This will try to automatically determine if the current tree is a + release tree by looking for git tags that belong to the current + top of tree revision. + + A string of the format -gxxxxxxxx will be added to the localversion + if a git-based tree is found. The string generated by this will be + appended after any matching localversion* files, and after the value + set in CONFIG_LOCALVERSION. + + (The actual string used here is the first eight characters produced + by running the command: + + $ git rev-parse --verify HEAD + + which is done within the script "scripts/setlocalversion".) + config SWAP bool "Support for paging of anonymous memory (swap)" - depends on MMU + depends on MMU && BLOCK default y help This option allows you to choose whether you want to have support - for socalled swap devices or swap files in your kernel that are + for so called swap devices or swap files in your kernel that are used to provide more virtual memory than the actual RAM present in your computer. If unsure say Y. config SYSVIPC bool "System V IPC" - depends on MMU ---help--- Inter Process Communication is a suite of library functions and system calls which let processes (running programs) synchronize and @@ -103,6 +117,12 @@ config SYSVIPC section 6.4 of the Linux Programmer's Guide, available from . +config SYSVIPC_SYSCTL + bool + depends on SYSVIPC + depends on SYSCTL + default y + config POSIX_MQUEUE bool "POSIX Message Queues" depends on NET && EXPERIMENTAL @@ -111,9 +131,7 @@ config POSIX_MQUEUE queues every message has a priority which decides about succession of receiving it by a process. If you want to compile and run programs written e.g. for Solaris with use of its POSIX message - queues (functions mq_*) say Y here. To use this feature you will - also need mqueue library, available from - + queues (functions mq_*) say Y here. POSIX message queues are visible as a filesystem called 'mqueue' and can be mounted somewhere if you want to do filesystem @@ -146,26 +164,60 @@ config BSD_PROCESS_ACCT_V3 for processing it. A preliminary version of these tools is available at . -config SYSCTL - bool "Sysctl support" - ---help--- - The sysctl interface provides a means of dynamically changing - certain kernel parameters and variables on the fly without requiring - a recompile of the kernel or reboot of the system. The primary - interface consists of a system call, but if you say Y to "/proc - file system support", a tree of modifiable sysctl entries will be - generated beneath the /proc/sys directory. They are explained in the - files in . Note that enabling this - option will enlarge the kernel by at least 8 KB. - - As it is generally a good thing, you should say Y here unless - building a kernel for install/rescue disks or your system is very - limited in memory. +config TASKSTATS + bool "Export task/process statistics through netlink (EXPERIMENTAL)" + depends on NET + default n + help + Export selected statistics for tasks/processes through the + generic netlink interface. Unlike BSD process accounting, the + statistics are available during the lifetime of tasks/processes as + responses to commands. Like BSD accounting, they are sent to user + space on task exit. + + Say N if unsure. + +config TASK_DELAY_ACCT + bool "Enable per-task delay accounting (EXPERIMENTAL)" + depends on TASKSTATS + help + Collect information on time spent by a task waiting for system + resources like cpu, synchronous block I/O completion and swapping + in pages. Such statistics can help in setting a task's priorities + relative to other tasks for cpu, io, rss limits etc. + + Say N if unsure. + +config TASK_XACCT + bool "Enable extended accounting over taskstats (EXPERIMENTAL)" + depends on TASKSTATS + help + Collect extended task accounting data and send the data + to userland for processing over the taskstats interface. + + Say N if unsure. + +config TASK_IO_ACCOUNTING + bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" + depends on TASK_XACCT + help + Collect information on the number of bytes of storage I/O which this + task has caused. + + Say N if unsure. + +config USER_NS + bool "User Namespaces (EXPERIMENTAL)" + default n + depends on EXPERIMENTAL + help + Support user namespaces. This allows containers, i.e. + vservers, to use user namespaces to provide different + user info for different servers. If unsure, say N. config AUDIT bool "Auditing support" depends on NET - default y if SECURITY_SELINUX help Enable auditing infrastructure that can be used with another kernel subsystem, such as SELinux (which requires this for @@ -174,42 +226,20 @@ config AUDIT config AUDITSYSCALL bool "Enable system-call auditing support" - depends on AUDIT && (X86 || PPC || PPC64 || ARCH_S390 || IA64 || UML) + depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64) default y if SECURITY_SELINUX help Enable low-overhead system-call auditing infrastructure that can be used independently or with another kernel subsystem, - such as SELinux. + such as SELinux. To use audit's filesystem watch feature, please + ensure that INOTIFY is configured. -config HOTPLUG - bool "Support for hot-pluggable devices" if !ARCH_S390 - default ARCH_S390 - help - This option is provided for the case where no in-kernel-tree - modules require HOTPLUG functionality, but a module built - outside the kernel tree does. Such modules require Y here. - -config KOBJECT_UEVENT - bool "Kernel Userspace Events" - depends on NET - default y - help - This option enables the kernel userspace event layer, which is a - simple mechanism for kernel-to-user communication over a netlink - socket. - The goal of the kernel userspace events layer is to provide a simple - and efficient events system, that notifies userspace about kobject - state changes. This will enable applications to just listen for - events instead of polling system devices and files. - Hotplug events (kobject addition and removal) are also available on - the netlink socket in addition to the execution of /sbin/hotplug if - CONFIG_HOTPLUG is enabled. - - Say Y, unless you are building a system requiring minimal memory - consumption. +config AUDIT_TREE + def_bool y + depends on AUDITSYSCALL && INOTIFY config IKCONFIG - bool "Kernel .config support" + tristate "Kernel .config support" ---help--- This option enables the complete Linux kernel ".config" file contents to be saved in the kernel. It provides documentation @@ -227,17 +257,172 @@ config IKCONFIG_PROC This option enables access to the kernel configuration file through /proc/config.gz. +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 + 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 + 13 => 8 KB + 12 => 4 KB + +config CGROUPS + bool "Control Group support" + help + This option will let you use process cgroup subsystems + such as Cpusets + + Say N if unsure. + +config CGROUP_DEBUG + bool "Example debug cgroup subsystem" + depends on CGROUPS + help + This option enables a simple cgroup subsystem that + exports useful debugging information about the cgroups + framework + + Say N if unsure + +config CGROUP_NS + bool "Namespace cgroup subsystem" + depends on CGROUPS + help + Provides a simple namespace cgroup subsystem to + provide hierarchical naming of sets of namespaces, + for instance virtual servers and checkpoint/restart + jobs. + +config CGROUP_CPUACCT + bool "Simple CPU accounting cgroup subsystem" + depends on CGROUPS + help + Provides a simple Resource Controller for monitoring the + total CPU consumed by the tasks in a cgroup + config CPUSETS bool "Cpuset support" - depends on SMP + depends on SMP && CGROUPS help - This options will let you create and manage CPUSET's which + This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and Memory Nodes and assigning tasks to run only within those sets. This is primarily useful on large SMP or NUMA systems. Say N if unsure. +config FAIR_GROUP_SCHED + bool "Fair group CPU scheduler" + default y + help + This feature lets CPU scheduler recognize task groups and control CPU + bandwidth allocation to such task groups. + +choice + depends on FAIR_GROUP_SCHED + prompt "Basis for grouping tasks" + default FAIR_USER_SCHED + +config FAIR_USER_SCHED + bool "user id" + help + This option will choose userid as the basis for grouping + tasks, thus providing equal CPU bandwidth to each user. + +config FAIR_CGROUP_SCHED + bool "Control groups" + depends on CGROUPS + help + This option allows you to create arbitrary task groups + using the "cgroup" pseudo filesystem and control + the cpu bandwidth allocated to each such task group. + Refer to Documentation/cgroups.txt for more information + on "cgroup" pseudo filesystem. + +endchoice + +config SYSFS_DEPRECATED + bool "Create deprecated sysfs files" + default y + help + This option creates deprecated symlinks such as the + "device"-link, the :-link, and the + "bus"-link. It may also add deprecated key in the + uevent environment. + None of these features or values should be used today, as + they export driver core implementation details to userspace + or export properties which can't be kept stable across kernel + releases. + + If enabled, this option will also move any device structures + that belong to a class, back into the /sys/class hierarchy, in + order to support older versions of udev. + + If you are using a distro that was released in 2006 or later, + it should be safe to say N here. + +config PROC_PID_CPUSET + bool "Include legacy /proc//cpuset file" + depends on CPUSETS + default y + +config RELAY + bool "Kernel->user space relay support (formerly relayfs)" + help + This option enables support for relay interface support in + certain file systems (such as debugfs). + It is designed to provide an efficient mechanism for tools and + facilities to relay large amounts of data from kernel space to + user space. + + If unsure, say N. + +config BLK_DEV_INITRD + bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" + depends on BROKEN || !FRV + help + The initial RAM filesystem is a ramfs which is loaded by the + boot loader (loadlin or lilo) and that is mounted as root + before the normal boot procedure. It is typically used to + load modules needed to mount the "real" root file system, + etc. See for details. + + If RAM disk support (BLK_DEV_RAM) is also included, this + also enables initial RAM disk (initrd) support and adds + 15 Kbytes (more on some other architectures) to the kernel size. + + If unsure say Y. + +if BLK_DEV_INITRD + +source "usr/Kconfig" + +endif + +config CC_OPTIMIZE_FOR_SIZE + bool "Optimize for size (Look out for broken compilers!)" + 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 + bool + menuconfig EMBEDDED bool "Configure standard kernel features (for small systems)" help @@ -246,8 +431,31 @@ menuconfig EMBEDDED environments which can tolerate a "non-standard" kernel. Only use this if you really know what you are doing. +config UID16 + bool "Enable 16-bit UID system calls" if EMBEDDED + depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) + default y + help + This enables the legacy 16-bit UID syscall wrappers. + +config SYSCTL_SYSCALL + bool "Sysctl syscall support" if EMBEDDED + default y + select SYSCTL + ---help--- + sys_sysctl uses binary paths that have been found challenging + to properly maintain and use. The interface in /proc/sys + using paths with ascii names is now the primary path to this + information. + + Almost nothing using the binary sysctl interface so if you are + trying to save some space it is probably safe to disable this, + making your kernel marginally smaller. + + If unsure say Y here. + config KALLSYMS - bool "Load all symbols for debugging/kksymoops" if EMBEDDED + bool "Load all symbols for debugging/ksymoops" if EMBEDDED default y help Say Y here to let the kernel print out symbolic crash information and @@ -260,8 +468,8 @@ config KALLSYMS_ALL help Normally kallsyms only contains the symbols of functions, for nicer OOPS messages. Some debuggers can use kallsyms for other - symbols too: say Y here to include all symbols, and you - don't care about adding 300k to the size of your kernel. + symbols too: say Y here to include all symbols, if you need them + and you don't care about adding 300k to the size of your kernel. Say N. @@ -277,6 +485,15 @@ config KALLSYMS_EXTRA_PASS you wait for kallsyms to be fixed. +config HOTPLUG + bool "Support for hot-pluggable devices" if EMBEDDED + default y + help + This option is provided for the case where no hotplug or uevent + capabilities is wanted by the kernel. You should only consider + disabling this option for embedded systems that do not use modules, a + dynamic /dev tree, or dynamic device discovery. Just say Y. + config PRINTK default y bool "Enable support for printk" if EMBEDDED @@ -297,6 +514,12 @@ config BUG option for embedded systems with no facilities for reporting errors. Just say Y. +config ELF_CORE + default y + bool "Enable ELF core dumps" if EMBEDDED + help + Enable support for generating core dumps. Disabling saves about 4k. + config BASE_FULL default y bool "Enable full-sized data structures for core" if EMBEDDED @@ -308,29 +531,53 @@ config BASE_FULL config FUTEX bool "Enable futex support" if EMBEDDED default y + select RT_MUTEXES help Disabling this option will cause the kernel to be built without support for "fast userspace mutexes". The resulting kernel may not run glibc-based applications correctly. +config ANON_INODES + bool + config EPOLL bool "Enable eventpoll support" if EMBEDDED default y + select ANON_INODES help Disabling this option will cause the kernel to be built without support for epoll family of system calls. -config CC_OPTIMIZE_FOR_SIZE - bool "Optimize for size" if EMBEDDED - default y if ARM || H8300 +config SIGNALFD + bool "Enable signalfd() system call" if EMBEDDED + select ANON_INODES + default y help - Enabling this option will pass "-Os" instead of "-O2" to gcc - resulting in a smaller kernel. + Enable the signalfd() system call that allows to receive signals + on a file descriptor. - 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 Y. - If unsure, say N. +config TIMERFD + bool "Enable timerfd() system call" if EMBEDDED + select ANON_INODES + depends on BROKEN + default y + help + Enable the timerfd() system call that allows to receive timer + events on a file descriptor. + + If unsure, say Y. + +config EVENTFD + bool "Enable eventfd() system call" if EMBEDDED + select ANON_INODES + default y + help + Enable the eventfd() system call that allows to receive both + kernel notification (ie. KAIO) or userspace notifications. + + If unsure, say Y. config SHMEM bool "Use full shmem filesystem" if EMBEDDED @@ -343,45 +590,66 @@ config SHMEM option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. -config CC_ALIGN_FUNCTIONS - int "Function alignment" if EMBEDDED - default 0 +config VM_EVENT_COUNTERS + default y + bool "Enable VM event counters for /proc/vmstat" if EMBEDDED help - Align the start of functions to the next power-of-two greater than n, - skipping up to n bytes. For instance, 32 aligns functions - to the next 32-byte boundary, but 24 would align to the next - 32-byte boundary only if this can be done by skipping 23 bytes or less. - Zero means use compiler's default. + VM event counters are needed for event counts to be shown. + This option allows the disabling of the VM event counters + on EMBEDDED systems. /proc/vmstat will only show page counts + if VM event counters are disabled. -config CC_ALIGN_LABELS - int "Label alignment" if EMBEDDED - default 0 +config SLUB_DEBUG + default y + bool "Enable SLUB debugging support" if EMBEDDED + depends on SLUB + help + SLUB has extensive debug support features. Disabling these can + result in significant savings in code size. This also disables + SLUB sysfs support. /sys/slab will not exist and there will be + no support for cache validation etc. + +choice + prompt "Choose SLAB allocator" + default SLUB + help + This option allows to select a slab allocator. + +config SLAB + bool "SLAB" help - Align all branch targets to a power-of-two boundary, skipping - up to n bytes like ALIGN_FUNCTIONS. This option can easily - make code slower, because it must insert dummy operations for - when the branch target is reached in the usual flow of the code. - Zero means use compiler's default. + The regular slab allocator that is established and known to work + well in all environments. It organizes cache hot objects in + per cpu and per node queues. SLAB is the default choice for + a slab allocator. -config CC_ALIGN_LOOPS - int "Loop alignment" if EMBEDDED - default 0 +config SLUB + bool "SLUB (Unqueued Allocator)" help - Align loops to a power-of-two boundary, skipping up to n bytes. - Zero means use compiler's default. + SLUB is a slab allocator that minimizes cache line usage + instead of managing queues of cached objects (SLAB approach). + Per cpu caching is realized using slabs of objects instead + of queues of objects. SLUB can use memory efficiently + and has enhanced diagnostics. -config CC_ALIGN_JUMPS - int "Jump alignment" if EMBEDDED - default 0 +config SLOB + depends on EMBEDDED + bool "SLOB (Simple Allocator)" help - Align branch targets to a power-of-two boundary, for branch - targets where the targets can only be reached by jumping, - skipping up to n bytes like ALIGN_FUNCTIONS. In this case, - no dummy operations need be executed. - Zero means use compiler's default. + SLOB replaces the SLAB allocator with a drastically simpler + allocator. SLOB is more space efficient than SLAB but does not + scale well (single lock for all operations) and is also highly + susceptible to fragmentation. SLUB can accomplish a higher object + density. It is usually better to use SLUB instead of SLOB. + +endchoice endmenu # General setup +config RT_MUTEXES + boolean + select PLIST + config TINY_SHMEM default !SHMEM bool @@ -391,9 +659,7 @@ config BASE_SMALL default 0 if BASE_FULL default 1 if !BASE_FULL -menu "Loadable module support" - -config MODULES +menuconfig MODULES bool "Enable loadable module support" help Kernel modules are small pieces of compiled code which can @@ -432,18 +698,9 @@ config MODULE_FORCE_UNLOAD rmmod). This is mainly for kernel developers and desperate users. If unsure, say N. -config OBSOLETE_MODPARM - bool - default y - depends on MODULES - help - You need this option to use module parameters on modules which - have not been converted to the new module parameter system yet. - If unsure, say Y. - config MODVERSIONS - bool "Module versioning support (EXPERIMENTAL)" - depends on MODULES && EXPERIMENTAL && !UML + bool "Module versioning support" + depends on MODULES help Usually, you have to use modules compiled with your kernel. Saying Y here makes it sometimes possible to use modules @@ -482,4 +739,8 @@ config STOP_MACHINE depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU help Need stop_machine() primitive. -endmenu + +source "block/Kconfig" + +config PREEMPT_NOTIFIERS + bool