2005-04-17 05:20:36 +07:00
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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drivers that have been replaced by something else, and/or are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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2005-10-31 06:01:46 +07:00
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Maximum of each of the number of arguments and environment
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variables passed to init from the kernel command line.
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2005-04-17 05:20:36 +07:00
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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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2005-07-31 15:57:49 +07:00
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config LOCALVERSION_AUTO
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bool "Automatically append version information to the version string"
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default y
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help
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This will try to automatically determine if the current tree is a
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release tree by looking for git tags that
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belong to the current top of tree revision.
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A string of the format -gxxxxxxxx will be added to the localversion
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if a git based tree is found. The string generated by this will be
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appended after any matching localversion* files, and after the value
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set in CONFIG_LOCALVERSION
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Note: This requires Perl, and a git repository, but not necessarily
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the git or cogito tools to be installed.
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2005-04-17 05:20:36 +07:00
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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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---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"
|
2005-05-11 16:52:45 +07:00
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depends on NET
|
2005-04-17 05:20:36 +07:00
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|
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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"
|
2006-01-06 15:19:28 +07:00
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depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
|
2005-04-17 05:20:36 +07:00
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|
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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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|
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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
|
|
|
|
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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|
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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
|
|
|
|
---help---
|
|
|
|
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
|
2005-07-28 01:45:11 +07:00
|
|
|
This option will let you create and manage CPUSETs which
|
2005-04-17 05:20:36 +07:00
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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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|
2005-08-11 01:44:50 +07:00
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source "usr/Kconfig"
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Move size optimization option outside of EMBEDDED menu, mark it EXPERIMENTAL
Also, disable on sparc64 - a number of people report breakage. Probably
a compiler bug, but it's quite possible that it tickles some latent
kernel problem too.
It still defaults to 'y' everywhere else (when enabled through
EXPERIMENTAL), and Dave Jones points out that Fedora (and RHEL4) has
been building with size optimizations for a long time on x86, x86-64,
ia64, s390, s390x, ppc32 and ppc64. So it is really only moderately
experimental, but the sparc64 breakage certainly shows that it can
trigger "issues".
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-12-15 09:52:21 +07:00
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config CC_OPTIMIZE_FOR_SIZE
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bool "Optimize for size (Look out for broken compilers!)"
|
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default y
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depends on ARM || H8300 || EXPERIMENTAL
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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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|
2005-04-17 05:20:36 +07:00
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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
|
|
|
|
Normally kallsyms only contains the symbols of functions, for nicer
|
|
|
|
OOPS messages. Some debuggers can use kallsyms for other
|
2005-07-20 10:43:05 +07:00
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|
symbols too: say Y here to include all symbols, if you need them
|
|
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|
and you don't care about adding 300k to the size of your kernel.
|
2005-04-17 05:20:36 +07:00
|
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Say N.
|
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|
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config KALLSYMS_EXTRA_PASS
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|
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bool "Do an extra kallsyms pass"
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|
|
depends on KALLSYMS
|
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|
help
|
|
|
|
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
|
|
|
|
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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|
|
2005-05-01 22:59:02 +07:00
|
|
|
|
2005-11-17 02:27:07 +07:00
|
|
|
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.
|
|
|
|
|
2005-05-01 22:59:02 +07:00
|
|
|
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.
|
|
|
|
|
2005-05-01 22:59:01 +07:00
|
|
|
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.
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
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.
|
|
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|
|
config FUTEX
|
|
|
|
bool "Enable futex support" if EMBEDDED
|
|
|
|
default y
|
|
|
|
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.
|
|
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|
|
|
|
|
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 CC_ALIGN_FUNCTIONS
|
|
|
|
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
|
|
|
|
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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|
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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
|
|
|
|
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.
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|
|
|
|
|
|
|
config CC_ALIGN_LOOPS
|
|
|
|
int "Loop alignment" if EMBEDDED
|
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|
|
default 0
|
|
|
|
help
|
|
|
|
Align loops to a power-of-two boundary, skipping up to n bytes.
|
|
|
|
Zero means use compiler's default.
|
|
|
|
|
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|
|
config CC_ALIGN_JUMPS
|
|
|
|
int "Jump alignment" if EMBEDDED
|
|
|
|
default 0
|
|
|
|
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.
|
|
|
|
|
|
|
|
endmenu # General setup
|
|
|
|
|
|
|
|
config TINY_SHMEM
|
|
|
|
default !SHMEM
|
|
|
|
bool
|
|
|
|
|
|
|
|
config BASE_SMALL
|
|
|
|
int
|
|
|
|
default 0 if BASE_FULL
|
|
|
|
default 1 if !BASE_FULL
|
|
|
|
|
|
|
|
menu "Loadable module support"
|
|
|
|
|
|
|
|
config MODULES
|
|
|
|
bool "Enable loadable module support"
|
|
|
|
help
|
|
|
|
Kernel modules are small pieces of compiled code which can
|
|
|
|
be inserted in the running kernel, rather than being
|
|
|
|
permanently built into the kernel. You use the "modprobe"
|
|
|
|
tool to add (and sometimes remove) them. If you say Y here,
|
|
|
|
many parts of the kernel can be built as modules (by
|
|
|
|
answering M instead of Y where indicated): this is most
|
|
|
|
useful for infrequently used options which are not required
|
|
|
|
for booting. For more information, see the man pages for
|
|
|
|
modprobe, lsmod, modinfo, insmod and rmmod.
|
|
|
|
|
|
|
|
If you say Y here, you will need to run "make
|
|
|
|
modules_install" to put the modules under /lib/modules/
|
|
|
|
where modprobe can find them (you may need to be root to do
|
|
|
|
this).
|
|
|
|
|
|
|
|
If unsure, say Y.
|
|
|
|
|
|
|
|
config MODULE_UNLOAD
|
|
|
|
bool "Module unloading"
|
|
|
|
depends on MODULES
|
|
|
|
help
|
|
|
|
Without this option you will not be able to unload any
|
|
|
|
modules (note that some modules may not be unloadable
|
|
|
|
anyway), which makes your kernel slightly smaller and
|
|
|
|
simpler. If unsure, say Y.
|
|
|
|
|
|
|
|
config MODULE_FORCE_UNLOAD
|
|
|
|
bool "Forced module unloading"
|
|
|
|
depends on MODULE_UNLOAD && EXPERIMENTAL
|
|
|
|
help
|
|
|
|
This option allows you to force a module to unload, even if the
|
|
|
|
kernel believes it is unsafe: the kernel will remove the module
|
|
|
|
without waiting for anyone to stop using it (using the -f option to
|
|
|
|
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
|
2005-12-27 05:04:02 +07:00
|
|
|
bool "Module versioning support"
|
|
|
|
depends on MODULES
|
2005-04-17 05:20:36 +07:00
|
|
|
help
|
|
|
|
Usually, you have to use modules compiled with your kernel.
|
|
|
|
Saying Y here makes it sometimes possible to use modules
|
|
|
|
compiled for different kernels, by adding enough information
|
|
|
|
to the modules to (hopefully) spot any changes which would
|
|
|
|
make them incompatible with the kernel you are running. If
|
|
|
|
unsure, say N.
|
|
|
|
|
|
|
|
config MODULE_SRCVERSION_ALL
|
|
|
|
bool "Source checksum for all modules"
|
|
|
|
depends on MODULES
|
|
|
|
help
|
|
|
|
Modules which contain a MODULE_VERSION get an extra "srcversion"
|
|
|
|
field inserted into their modinfo section, which contains a
|
|
|
|
sum of the source files which made it. This helps maintainers
|
|
|
|
see exactly which source was used to build a module (since
|
|
|
|
others sometimes change the module source without updating
|
|
|
|
the version). With this option, such a "srcversion" field
|
|
|
|
will be created for all modules. If unsure, say N.
|
|
|
|
|
|
|
|
config KMOD
|
|
|
|
bool "Automatic kernel module loading"
|
|
|
|
depends on MODULES
|
|
|
|
help
|
|
|
|
Normally when you have selected some parts of the kernel to
|
|
|
|
be created as kernel modules, you must load them (using the
|
|
|
|
"modprobe" command) before you can use them. If you say Y
|
|
|
|
here, some parts of the kernel will be able to load modules
|
|
|
|
automatically: when a part of the kernel needs a module, it
|
|
|
|
runs modprobe with the appropriate arguments, thereby
|
|
|
|
loading the module if it is available. If unsure, say Y.
|
|
|
|
|
|
|
|
config STOP_MACHINE
|
|
|
|
bool
|
|
|
|
default y
|
|
|
|
depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
|
|
|
|
help
|
|
|
|
Need stop_machine() primitive.
|
|
|
|
endmenu
|
2005-11-04 14:43:35 +07:00
|
|
|
|
|
|
|
menu "Block layer"
|
|
|
|
source "block/Kconfig"
|
|
|
|
endmenu
|