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 "Code maturity level options" config EXPERIMENTAL	bool "Prompt for development and/or incomplete code/drivers"	---help---	  Some of the various things that Linux supports (such as network	  drivers, file systems, network protocols, etc.) can be in a state	  of development where the functionality, stability, or the level of	  testing is not yet high enough for general use. This is usually	  known as the "alpha-test" phase among developers. If a feature is	  currently in alpha-test, then the developers usually discourage	  uninformed widespread use of this feature by the general public to	  avoid "Why doesn't this work?" type mail messages. However, active	  testing and use of these systems is welcomed. Just be aware that it	  may not meet the normal level of reliability or it may fail to work	  in some special cases. Detailed bug reports from people familiar	  with the kernel internals are usually welcomed by the developers	  (before submitting bug reports, please read the documents	  <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,	  <file:Documentation/BUG-HUNTING>, and	  <file:Documentation/oops-tracing.txt> in the kernel source). 	  This option will also make obsoleted drivers available. These are	  drivers that have been replaced by something else, and/or are	  scheduled to be removed in a future kernel release. 	  Unless you intend to help test and develop a feature or driver that	  falls into this category, or you have a situation that requires	  using these features, you should probably say N here, which will	  cause the configurator to present you with fewer choices. If	  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 BROKEN	bool config BROKEN_ON_SMP	bool	depends on BROKEN || !SMP	default y config LOCK_KERNEL	bool	depends on SMP || PREEMPT	default y config INIT_ENV_ARG_LIMIT	int	default 32 if !UML	default 128 if UML	help	  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"	help	  Append an extra string to the end of your kernel version.	  This will show up when you type uname, for example.	  The string you set here will be appended after the contents of	  any files with a filename matching localversion* in your	  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 	  Note: This requires Perl, and a git repository, but not necessarily	  the git or cogito tools to be installed. config SWAP	bool "Support for paging of anonymous memory (swap)"	depends on MMU && BLOCK	default y	help	  This option allows you to choose whether you want to have support	  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"	---help---	  Inter Process Communication is a suite of library functions and	  system calls which let processes (running programs) synchronize and	  exchange information. It is generally considered to be a good thing,	  and some programs won't run unless you say Y here. In particular, if	  you want to run the DOS emulator dosemu under Linux (read the	  DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),	  you'll need to say Y here. 	  You can find documentation about IPC with "info ipc" and also in	  section 6.4 of the Linux Programmer's Guide, available from	  <http://www.tldp.org/guides.html>. config IPC_NS	bool "IPC Namespaces"	depends on SYSVIPC	default n	help	  Support ipc namespaces.  This allows containers, i.e. virtual	  environments, to use ipc namespaces to provide different ipc	  objects for different servers.  If unsure, say N. config SYSVIPC_SYSCTL	bool	depends on SYSVIPC	depends on SYSCTL	default y config POSIX_MQUEUE	bool "POSIX Message Queues"	depends on NET && EXPERIMENTAL	---help---	  POSIX variant of message queues is a part of IPC. In POSIX message	  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	  <http://www.mat.uni.torun.pl/~wrona/posix_ipc/> 	  POSIX message queues are visible as a filesystem called 'mqueue'	  and can be mounted somewhere if you want to do filesystem	  operations on message queues. 	  If unsure, say Y. config BSD_PROCESS_ACCT	bool "BSD Process Accounting"	help	  If you say Y here, a user level program will be able to instruct the	  kernel (via a special system call) to write process accounting	  information to a file: whenever a process exits, information about	  that process will be appended to the file by the kernel.  The	  information includes things such as creation time, owning user,	  command name, memory usage, controlling terminal etc. (the complete	  list is in the struct acct in <file:include/linux/acct.h>).  It is	  up to the user level program to do useful things with this	  information.  This is generally a good idea, so say Y. config BSD_PROCESS_ACCT_V3	bool "BSD Process Accounting version 3 file format"	depends on BSD_PROCESS_ACCT	default n	help	  If you say Y here, the process accounting information is written	  in a new file format that also logs the process IDs of each	  process and it's parent. Note that this file format is incompatible	  with previous v0/v1/v2 file formats, so you will need updated tools	  for processing it. A preliminary version of these tools is available	  at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>. 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 UTS_NS	bool "UTS Namespaces"	default n	help	  Support uts namespaces.  This allows containers, i.e.	  vservers, to use uts namespaces to provide different	  uts info for different servers.  If unsure, say N. config AUDIT	bool "Auditing support"	depends on NET	help	  Enable auditing infrastructure that can be used with another	  kernel subsystem, such as SELinux (which requires this for	  logging of avc messages output).  Does not do system-call	  auditing without CONFIG_AUDITSYSCALL. config AUDITSYSCALL	bool "Enable system-call auditing support"	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.  To use audit's filesystem watch feature, please	  ensure that INOTIFY is configured. config IKCONFIG	tristate "Kernel .config support"	---help---	  This option enables the complete Linux kernel ".config" file	  contents to be saved in the kernel. It provides documentation	  of which kernel options are used in a running kernel or in an	  on-disk kernel.  This information can be extracted from the kernel	  image file with the script scripts/extract-ikconfig and used as	  input to rebuild the current kernel or to build another kernel.	  It can also be extracted from a running kernel by reading	  /proc/config.gz if enabled (below). config IKCONFIG_PROC	bool "Enable access to .config through /proc/config.gz"	depends on IKCONFIG && PROC_FS	---help---	  This option enables access to the kernel configuration file	  through /proc/config.gz. config CPUSETS	bool "Cpuset support"	depends on SMP	help	  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 SYSFS_DEPRECATED	bool "Create deprecated sysfs files"	default y	help	  This option creates deprecated symlinks such as the	  "device"-link, the <subsystem>:<name>-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 heirachy, 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 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 <file:Documentation/initrd.txt> 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 || 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	  This option allows certain base kernel options and settings          to be disabled or tweaked. This is for specialized          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 || 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/ksymoops" if EMBEDDED	 default y	 help	   Say Y here to let the kernel print out symbolic crash information and	   symbolic stack backtraces. This increases the size of the kernel	   somewhat, as all symbols have to be loaded into the kernel image. config KALLSYMS_ALL	bool "Include all symbols in kallsyms"	depends on DEBUG_KERNEL && KALLSYMS	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, if you need them 	   and you don't care about adding 300k to the size of your kernel. 	   Say N. config KALLSYMS_EXTRA_PASS	bool "Do an extra kallsyms pass"	depends on KALLSYMS	help	   If kallsyms is not working correctly, the build will fail with	   inconsistent kallsyms data.  If that occurs, log a bug report and	   turn on KALLSYMS_EXTRA_PASS which should result in a stable build.	   Always say N here unless you find a bug in kallsyms, which must be	   reported.  KALLSYMS_EXTRA_PASS is only a temporary workaround while	   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	help	  This option enables normal printk support. Removing it	  eliminates most of the message strings from the kernel image	  and makes the kernel more or less silent. As this makes it	  very difficult to diagnose system problems, saying N here is	  strongly discouraged. config BUG	bool "BUG() support" if EMBEDDED	default y	help          Disabling this option eliminates support for BUG and WARN, reducing          the size of your kernel image and potentially quietly ignoring          numerous fatal conditions. You should only consider disabling this          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	help	  Disabling this option reduces the size of miscellaneous core	  kernel data structures. This saves memory on small machines,	  but may reduce performance. 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 EPOLL	bool "Enable eventpoll support" if EMBEDDED	default y	help	  Disabling this option will cause the kernel to be built without	  support for epoll family of system calls. config SHMEM	bool "Use full shmem filesystem" if EMBEDDED	default y	depends on MMU	help	  The shmem is an internal filesystem used to manage shared memory.	  It is backed by swap and manages resource limits. It is also exported	  to userspace as tmpfs if TMPFS is enabled. Disabling this	  option replaces shmem and tmpfs with the much simpler ramfs code,	  which may be appropriate on small systems without swap. config SLAB	default y	bool "Use full SLAB allocator" if (EMBEDDED && !SMP && !SPARSEMEM)	help	  Disabling this replaces the advanced SLAB allocator and	  kmalloc support with the drastically simpler SLOB allocator.	  SLOB is more space efficient but does not scale well and is	  more susceptible to fragmentation. config VM_EVENT_COUNTERS	default y	bool "Enable VM event counters for /proc/vmstat" if EMBEDDED	help	  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. endmenu		# General setup config RT_MUTEXES	boolean	select PLIST 

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