mirror of https://gitee.com/openkylin/linux.git
474 lines
17 KiB
Plaintext
474 lines
17 KiB
Plaintext
menu "Code maturity level options"
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config EXPERIMENTAL
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bool "Prompt for development and/or incomplete code/drivers"
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---help---
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Some of the various things that Linux supports (such as network
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drivers, file systems, network protocols, etc.) can be in a state
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of development where the functionality, stability, or the level of
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testing is not yet high enough for general use. This is usually
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known as the "alpha-test" phase among developers. If a feature is
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currently in alpha-test, then the developers usually discourage
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uninformed widespread use of this feature by the general public to
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avoid "Why doesn't this work?" type mail messages. However, active
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testing and use of these systems is welcomed. Just be aware that it
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may not meet the normal level of reliability or it may fail to work
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in some special cases. Detailed bug reports from people familiar
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with the kernel internals are usually welcomed by the developers
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(before submitting bug reports, please read the documents
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<file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
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<file:Documentation/BUG-HUNTING>, and
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<file:Documentation/oops-tracing.txt> in the kernel source).
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This option will also make obsoleted drivers available. These are
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drivers that have been replaced by something else, and/or are
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scheduled to be removed in a future kernel release.
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Unless you intend to help test and develop a feature or driver that
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falls into this category, or you have a situation that requires
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using these features, you should probably say N here, which will
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cause the configurator to present you with fewer choices. If
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you say Y here, you will be offered the choice of using features or
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drivers that are currently considered to be in the alpha-test phase.
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config CLEAN_COMPILE
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bool "Select only drivers expected to compile cleanly" if EXPERIMENTAL
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default y
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help
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Select this option if you don't even want to see the option
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to configure known-broken drivers.
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If unsure, say Y
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config BROKEN
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bool
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depends on !CLEAN_COMPILE
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default y
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config BROKEN_ON_SMP
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bool
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depends on BROKEN || !SMP
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default y
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config LOCK_KERNEL
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bool
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depends on SMP || PREEMPT
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default y
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config INIT_ENV_ARG_LIMIT
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int
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default 32 if !USERMODE
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default 128 if USERMODE
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help
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This is the value of the two limits on the number of argument and of
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env.var passed to init from the kernel command line.
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endmenu
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menu "General setup"
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config LOCALVERSION
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string "Local version - append to kernel release"
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help
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Append an extra string to the end of your kernel version.
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This will show up when you type uname, for example.
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The string you set here will be appended after the contents of
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any files with a filename matching localversion* in your
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object and source tree, in that order. Your total string can
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be a maximum of 64 characters.
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config SWAP
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bool "Support for paging of anonymous memory (swap)"
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depends on MMU
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default y
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help
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This option allows you to choose whether you want to have support
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for socalled swap devices or swap files in your kernel that are
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used to provide more virtual memory than the actual RAM present
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in your computer. If unsure say Y.
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config SYSVIPC
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bool "System V IPC"
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depends on MMU
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---help---
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Inter Process Communication is a suite of library functions and
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system calls which let processes (running programs) synchronize and
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exchange information. It is generally considered to be a good thing,
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and some programs won't run unless you say Y here. In particular, if
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you want to run the DOS emulator dosemu under Linux (read the
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DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
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you'll need to say Y here.
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You can find documentation about IPC with "info ipc" and also in
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section 6.4 of the Linux Programmer's Guide, available from
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<http://www.tldp.org/guides.html>.
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config POSIX_MQUEUE
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bool "POSIX Message Queues"
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depends on NET && EXPERIMENTAL
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---help---
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POSIX variant of message queues is a part of IPC. In POSIX message
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queues every message has a priority which decides about succession
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of receiving it by a process. If you want to compile and run
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programs written e.g. for Solaris with use of its POSIX message
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queues (functions mq_*) say Y here. To use this feature you will
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also need mqueue library, available from
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<http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
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POSIX message queues are visible as a filesystem called 'mqueue'
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and can be mounted somewhere if you want to do filesystem
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operations on message queues.
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If unsure, say Y.
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config BSD_PROCESS_ACCT
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bool "BSD Process Accounting"
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help
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If you say Y here, a user level program will be able to instruct the
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kernel (via a special system call) to write process accounting
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information to a file: whenever a process exits, information about
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that process will be appended to the file by the kernel. The
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information includes things such as creation time, owning user,
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command name, memory usage, controlling terminal etc. (the complete
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list is in the struct acct in <file:include/linux/acct.h>). It is
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up to the user level program to do useful things with this
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information. This is generally a good idea, so say Y.
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config BSD_PROCESS_ACCT_V3
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bool "BSD Process Accounting version 3 file format"
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depends on BSD_PROCESS_ACCT
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default n
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help
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If you say Y here, the process accounting information is written
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in a new file format that also logs the process IDs of each
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process and it's parent. Note that this file format is incompatible
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with previous v0/v1/v2 file formats, so you will need updated tools
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for processing it. A preliminary version of these tools is available
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at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
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config SYSCTL
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bool "Sysctl support"
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---help---
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The sysctl interface provides a means of dynamically changing
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certain kernel parameters and variables on the fly without requiring
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a recompile of the kernel or reboot of the system. The primary
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interface consists of a system call, but if you say Y to "/proc
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file system support", a tree of modifiable sysctl entries will be
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generated beneath the /proc/sys directory. They are explained in the
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files in <file:Documentation/sysctl/>. Note that enabling this
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option will enlarge the kernel by at least 8 KB.
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As it is generally a good thing, you should say Y here unless
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building a kernel for install/rescue disks or your system is very
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limited in memory.
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config AUDIT
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bool "Auditing support"
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default y if SECURITY_SELINUX
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help
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Enable auditing infrastructure that can be used with another
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kernel subsystem, such as SELinux (which requires this for
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logging of avc messages output). Does not do system-call
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auditing without CONFIG_AUDITSYSCALL.
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config AUDITSYSCALL
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bool "Enable system-call auditing support"
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depends on AUDIT && (X86 || PPC64 || ARCH_S390 || IA64)
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default y if SECURITY_SELINUX
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help
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Enable low-overhead system-call auditing infrastructure that
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can be used independently or with another kernel subsystem,
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such as SELinux.
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config HOTPLUG
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bool "Support for hot-pluggable devices" if !ARCH_S390
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default ARCH_S390
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help
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This option is provided for the case where no in-kernel-tree
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modules require HOTPLUG functionality, but a module built
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outside the kernel tree does. Such modules require Y here.
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config KOBJECT_UEVENT
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bool "Kernel Userspace Events"
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depends on NET
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default y
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help
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This option enables the kernel userspace event layer, which is a
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simple mechanism for kernel-to-user communication over a netlink
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socket.
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The goal of the kernel userspace events layer is to provide a simple
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and efficient events system, that notifies userspace about kobject
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state changes. This will enable applications to just listen for
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events instead of polling system devices and files.
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Hotplug events (kobject addition and removal) are also available on
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the netlink socket in addition to the execution of /sbin/hotplug if
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CONFIG_HOTPLUG is enabled.
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Say Y, unless you are building a system requiring minimal memory
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consumption.
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config IKCONFIG
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bool "Kernel .config support"
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---help---
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This option enables the complete Linux kernel ".config" file
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contents to be saved in the kernel. It provides documentation
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of which kernel options are used in a running kernel or in an
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on-disk kernel. This information can be extracted from the kernel
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image file with the script scripts/extract-ikconfig and used as
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input to rebuild the current kernel or to build another kernel.
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It can also be extracted from a running kernel by reading
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/proc/config.gz if enabled (below).
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config IKCONFIG_PROC
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bool "Enable access to .config through /proc/config.gz"
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depends on IKCONFIG && PROC_FS
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---help---
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This option enables access to the kernel configuration file
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through /proc/config.gz.
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config CPUSETS
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bool "Cpuset support"
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depends on SMP
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help
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This options will let you create and manage CPUSET's which
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allow dynamically partitioning a system into sets of CPUs and
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Memory Nodes and assigning tasks to run only within those sets.
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This is primarily useful on large SMP or NUMA systems.
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Say N if unsure.
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menuconfig EMBEDDED
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bool "Configure standard kernel features (for small systems)"
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help
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This option allows certain base kernel options and settings
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to be disabled or tweaked. This is for specialized
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environments which can tolerate a "non-standard" kernel.
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Only use this if you really know what you are doing.
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config KALLSYMS
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bool "Load all symbols for debugging/kksymoops" if EMBEDDED
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default y
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help
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Say Y here to let the kernel print out symbolic crash information and
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symbolic stack backtraces. This increases the size of the kernel
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somewhat, as all symbols have to be loaded into the kernel image.
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config KALLSYMS_ALL
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bool "Include all symbols in kallsyms"
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depends on DEBUG_KERNEL && KALLSYMS
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help
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Normally kallsyms only contains the symbols of functions, for nicer
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OOPS messages. Some debuggers can use kallsyms for other
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symbols too: say Y here to include all symbols, and you
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don't care about adding 300k to the size of your kernel.
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Say N.
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config KALLSYMS_EXTRA_PASS
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bool "Do an extra kallsyms pass"
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depends on KALLSYMS
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help
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If kallsyms is not working correctly, the build will fail with
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inconsistent kallsyms data. If that occurs, log a bug report and
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turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
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Always say N here unless you find a bug in kallsyms, which must be
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reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
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you wait for kallsyms to be fixed.
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config BUG
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bool "BUG() support" if EMBEDDED
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default y
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help
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Disabling this option eliminates support for BUG and WARN, reducing
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the size of your kernel image and potentially quietly ignoring
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numerous fatal conditions. You should only consider disabling this
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option for embedded systems with no facilities for reporting errors.
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Just say Y.
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config BASE_FULL
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default y
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bool "Enable full-sized data structures for core" if EMBEDDED
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help
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Disabling this option reduces the size of miscellaneous core
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kernel data structures. This saves memory on small machines,
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but may reduce performance.
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config FUTEX
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bool "Enable futex support" if EMBEDDED
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default y
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help
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Disabling this option will cause the kernel to be built without
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support for "fast userspace mutexes". The resulting kernel may not
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run glibc-based applications correctly.
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config EPOLL
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bool "Enable eventpoll support" if EMBEDDED
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default y
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help
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Disabling this option will cause the kernel to be built without
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support for epoll family of system calls.
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config CC_OPTIMIZE_FOR_SIZE
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bool "Optimize for size" if EMBEDDED
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default y if ARM || H8300
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help
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Enabling this option will pass "-Os" instead of "-O2" to gcc
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resulting in a smaller kernel.
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WARNING: some versions of gcc may generate incorrect code with this
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option. If problems are observed, a gcc upgrade may be needed.
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If unsure, say N.
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config SHMEM
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bool "Use full shmem filesystem" if EMBEDDED
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default y
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depends on MMU
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help
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The shmem is an internal filesystem used to manage shared memory.
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It is backed by swap and manages resource limits. It is also exported
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to userspace as tmpfs if TMPFS is enabled. Disabling this
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option replaces shmem and tmpfs with the much simpler ramfs code,
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which may be appropriate on small systems without swap.
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config CC_ALIGN_FUNCTIONS
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int "Function alignment" if EMBEDDED
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default 0
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help
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Align the start of functions to the next power-of-two greater than n,
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skipping up to n bytes. For instance, 32 aligns functions
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to the next 32-byte boundary, but 24 would align to the next
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32-byte boundary only if this can be done by skipping 23 bytes or less.
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Zero means use compiler's default.
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config CC_ALIGN_LABELS
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int "Label alignment" if EMBEDDED
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default 0
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help
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Align all branch targets to a power-of-two boundary, skipping
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up to n bytes like ALIGN_FUNCTIONS. This option can easily
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make code slower, because it must insert dummy operations for
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when the branch target is reached in the usual flow of the code.
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Zero means use compiler's default.
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config CC_ALIGN_LOOPS
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int "Loop alignment" if EMBEDDED
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default 0
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help
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Align loops to a power-of-two boundary, skipping up to n bytes.
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Zero means use compiler's default.
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config CC_ALIGN_JUMPS
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int "Jump alignment" if EMBEDDED
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default 0
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help
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Align branch targets to a power-of-two boundary, for branch
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targets where the targets can only be reached by jumping,
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skipping up to n bytes like ALIGN_FUNCTIONS. In this case,
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no dummy operations need be executed.
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Zero means use compiler's default.
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endmenu # General setup
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config TINY_SHMEM
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default !SHMEM
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bool
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config BASE_SMALL
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int
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default 0 if BASE_FULL
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default 1 if !BASE_FULL
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menu "Loadable module support"
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config MODULES
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bool "Enable loadable module support"
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help
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Kernel modules are small pieces of compiled code which can
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be inserted in the running kernel, rather than being
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permanently built into the kernel. You use the "modprobe"
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tool to add (and sometimes remove) them. If you say Y here,
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many parts of the kernel can be built as modules (by
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answering M instead of Y where indicated): this is most
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useful for infrequently used options which are not required
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for booting. For more information, see the man pages for
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modprobe, lsmod, modinfo, insmod and rmmod.
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If you say Y here, you will need to run "make
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modules_install" to put the modules under /lib/modules/
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where modprobe can find them (you may need to be root to do
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this).
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If unsure, say Y.
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config MODULE_UNLOAD
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bool "Module unloading"
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depends on MODULES
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help
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Without this option you will not be able to unload any
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modules (note that some modules may not be unloadable
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anyway), which makes your kernel slightly smaller and
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simpler. If unsure, say Y.
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config MODULE_FORCE_UNLOAD
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bool "Forced module unloading"
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depends on MODULE_UNLOAD && EXPERIMENTAL
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help
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This option allows you to force a module to unload, even if the
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kernel believes it is unsafe: the kernel will remove the module
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without waiting for anyone to stop using it (using the -f option to
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rmmod). This is mainly for kernel developers and desperate users.
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If unsure, say N.
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config OBSOLETE_MODPARM
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bool
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default y
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depends on MODULES
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help
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You need this option to use module parameters on modules which
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have not been converted to the new module parameter system yet.
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If unsure, say Y.
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config MODVERSIONS
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bool "Module versioning support (EXPERIMENTAL)"
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depends on MODULES && EXPERIMENTAL && !UML
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help
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Usually, you have to use modules compiled with your kernel.
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Saying Y here makes it sometimes possible to use modules
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compiled for different kernels, by adding enough information
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to the modules to (hopefully) spot any changes which would
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make them incompatible with the kernel you are running. If
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unsure, say N.
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config MODULE_SRCVERSION_ALL
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bool "Source checksum for all modules"
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depends on MODULES
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help
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Modules which contain a MODULE_VERSION get an extra "srcversion"
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field inserted into their modinfo section, which contains a
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sum of the source files which made it. This helps maintainers
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see exactly which source was used to build a module (since
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others sometimes change the module source without updating
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the version). With this option, such a "srcversion" field
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will be created for all modules. If unsure, say N.
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config KMOD
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bool "Automatic kernel module loading"
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depends on MODULES
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help
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Normally when you have selected some parts of the kernel to
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be created as kernel modules, you must load them (using the
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"modprobe" command) before you can use them. If you say Y
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here, some parts of the kernel will be able to load modules
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automatically: when a part of the kernel needs a module, it
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runs modprobe with the appropriate arguments, thereby
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loading the module if it is available. If unsure, say Y.
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config STOP_MACHINE
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bool
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default y
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depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
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help
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Need stop_machine() primitive.
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endmenu
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