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kconfig: consolidate printk options
Same deal, take the printk-related things and hide them in a menu. This takes another 4 items out of the top-level menu. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Hansen
Linus Torvalds
parent
9eade16b41
commit
604ff0dceb
@ -1,3 +1,4 @@
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menu "printk and dmesg options"
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config PRINTK_TIME
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bool "Show timing information on printks"
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@ -25,6 +26,95 @@ config DEFAULT_MESSAGE_LOGLEVEL
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that are auditing their logs closely may want to set it to a lower
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priority.
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config BOOT_PRINTK_DELAY
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bool "Delay each boot printk message by N milliseconds"
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depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
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help
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This build option allows you to read kernel boot messages
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by inserting a short delay after each one. The delay is
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specified in milliseconds on the kernel command line,
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using "boot_delay=N".
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It is likely that you would also need to use "lpj=M" to preset
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the "loops per jiffie" value.
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See a previous boot log for the "lpj" value to use for your
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system, and then set "lpj=M" before setting "boot_delay=N".
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NOTE: Using this option may adversely affect SMP systems.
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I.e., processors other than the first one may not boot up.
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BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
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what it believes to be lockup conditions.
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config DYNAMIC_DEBUG
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bool "Enable dynamic printk() support"
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default n
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depends on PRINTK
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depends on DEBUG_FS
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help
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Compiles debug level messages into the kernel, which would not
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otherwise be available at runtime. These messages can then be
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enabled/disabled based on various levels of scope - per source file,
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function, module, format string, and line number. This mechanism
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implicitly compiles in all pr_debug() and dev_dbg() calls, which
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enlarges the kernel text size by about 2%.
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If a source file is compiled with DEBUG flag set, any
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pr_debug() calls in it are enabled by default, but can be
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disabled at runtime as below. Note that DEBUG flag is
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turned on by many CONFIG_*DEBUG* options.
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Usage:
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Dynamic debugging is controlled via the 'dynamic_debug/control' file,
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which is contained in the 'debugfs' filesystem. Thus, the debugfs
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filesystem must first be mounted before making use of this feature.
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We refer the control file as: <debugfs>/dynamic_debug/control. This
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file contains a list of the debug statements that can be enabled. The
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format for each line of the file is:
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filename:lineno [module]function flags format
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filename : source file of the debug statement
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lineno : line number of the debug statement
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module : module that contains the debug statement
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function : function that contains the debug statement
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flags : '=p' means the line is turned 'on' for printing
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format : the format used for the debug statement
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From a live system:
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nullarbor:~ # cat <debugfs>/dynamic_debug/control
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# filename:lineno [module]function flags format
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fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
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fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
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fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
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Example usage:
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// enable the message at line 1603 of file svcsock.c
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nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
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<debugfs>/dynamic_debug/control
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// enable all the messages in file svcsock.c
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nullarbor:~ # echo -n 'file svcsock.c +p' >
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<debugfs>/dynamic_debug/control
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// enable all the messages in the NFS server module
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nullarbor:~ # echo -n 'module nfsd +p' >
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<debugfs>/dynamic_debug/control
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// enable all 12 messages in the function svc_process()
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nullarbor:~ # echo -n 'func svc_process +p' >
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<debugfs>/dynamic_debug/control
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// disable all 12 messages in the function svc_process()
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nullarbor:~ # echo -n 'func svc_process -p' >
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<debugfs>/dynamic_debug/control
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See Documentation/dynamic-debug-howto.txt for additional information.
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endmenu # "printk and dmesg options"
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menu "Compile-time checks and compiler options"
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config DEBUG_INFO
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@ -940,24 +1030,6 @@ config DEBUG_CREDENTIALS
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If unsure, say N.
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config BOOT_PRINTK_DELAY
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bool "Delay each boot printk message by N milliseconds"
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depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
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help
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This build option allows you to read kernel boot messages
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by inserting a short delay after each one. The delay is
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specified in milliseconds on the kernel command line,
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using "boot_delay=N".
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It is likely that you would also need to use "lpj=M" to preset
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the "loops per jiffie" value.
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See a previous boot log for the "lpj" value to use for your
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system, and then set "lpj=M" before setting "boot_delay=N".
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NOTE: Using this option may adversely affect SMP systems.
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I.e., processors other than the first one may not boot up.
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BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
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what it believes to be lockup conditions.
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menu "RCU Debugging"
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config PROVE_RCU
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@ -1441,75 +1513,6 @@ config BUILD_DOCSRC
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Say N if you are unsure.
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config DYNAMIC_DEBUG
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bool "Enable dynamic printk() support"
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default n
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depends on PRINTK
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depends on DEBUG_FS
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help
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Compiles debug level messages into the kernel, which would not
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otherwise be available at runtime. These messages can then be
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enabled/disabled based on various levels of scope - per source file,
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function, module, format string, and line number. This mechanism
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implicitly compiles in all pr_debug() and dev_dbg() calls, which
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enlarges the kernel text size by about 2%.
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If a source file is compiled with DEBUG flag set, any
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pr_debug() calls in it are enabled by default, but can be
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disabled at runtime as below. Note that DEBUG flag is
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turned on by many CONFIG_*DEBUG* options.
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Usage:
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Dynamic debugging is controlled via the 'dynamic_debug/control' file,
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which is contained in the 'debugfs' filesystem. Thus, the debugfs
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filesystem must first be mounted before making use of this feature.
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We refer the control file as: <debugfs>/dynamic_debug/control. This
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file contains a list of the debug statements that can be enabled. The
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format for each line of the file is:
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filename:lineno [module]function flags format
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filename : source file of the debug statement
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lineno : line number of the debug statement
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module : module that contains the debug statement
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function : function that contains the debug statement
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flags : '=p' means the line is turned 'on' for printing
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format : the format used for the debug statement
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From a live system:
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nullarbor:~ # cat <debugfs>/dynamic_debug/control
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# filename:lineno [module]function flags format
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fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
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fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
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fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
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Example usage:
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// enable the message at line 1603 of file svcsock.c
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nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
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<debugfs>/dynamic_debug/control
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// enable all the messages in file svcsock.c
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nullarbor:~ # echo -n 'file svcsock.c +p' >
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<debugfs>/dynamic_debug/control
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// enable all the messages in the NFS server module
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nullarbor:~ # echo -n 'module nfsd +p' >
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<debugfs>/dynamic_debug/control
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// enable all 12 messages in the function svc_process()
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nullarbor:~ # echo -n 'func svc_process +p' >
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<debugfs>/dynamic_debug/control
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// disable all 12 messages in the function svc_process()
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nullarbor:~ # echo -n 'func svc_process -p' >
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<debugfs>/dynamic_debug/control
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See Documentation/dynamic-debug-howto.txt for additional information.
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config DMA_API_DEBUG
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bool "Enable debugging of DMA-API usage"
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depends on HAVE_DMA_API_DEBUG
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