使用Kernel的Makefile生成tags和cscope看代码更方便

[root@btg ext4]# make help
Cleaning targets:
clean		  - Remove most generated files but keep the config and
enough build support to build external modules
mrproper	  - Remove all generated files + config + various backup files
distclean	  - mrproper + remove editor backup and patch files

Configuration targets:
config	  - Update current config utilising a line-oriented program
nconfig         - Update current config utilising a ncurses menu based program
menuconfig	  - Update current config utilising a menu based program
xconfig	  - Update current config utilising a QT based front-end
gconfig	  - Update current config utilising a GTK based front-end
oldconfig	  - Update current config utilising a provided .config as base
localmodconfig  - Update current config disabling modules not loaded
localyesconfig  - Update current config converting local mods to core
silentoldconfig - Same as oldconfig, but quietly, additionally update deps
defconfig	  - New config with default from ARCH supplied defconfig
savedefconfig   - Save current config as ./defconfig (minimal config)
allnoconfig	  - New config where all options are answered with no
allyesconfig	  - New config where all options are accepted with yes
allmodconfig	  - New config selecting modules when possible
alldefconfig    - New config with all symbols set to default
randconfig	  - New config with random answer to all options
listnewconfig   - List new options
oldnoconfig     - Same as silentoldconfig but set new symbols to n (unset)

Other generic targets:
all		  - Build all targets marked with [*]
* vmlinux	  - Build the bare kernel
* modules	  - Build all modules
modules_install - Install all modules to INSTALL_MOD_PATH (default: /)
firmware_install- Install all firmware to INSTALL_FW_PATH
(default: $(INSTALL_MOD_PATH)/lib/firmware)
dir/            - Build all files in dir and below
dir/file.[oisS] - Build specified target only
dir/file.lst    - Build specified mixed source/assembly target only
(requires a recent binutils and recent build (System.map))
dir/file.ko     - Build module including final link
modules_prepare - Set up for building external modules
tags/TAGS	  - Generate tags file for editors
cscope	  - Generate cscope index
gtags           - Generate GNU GLOBAL index
kernelrelease	  - Output the release version string
kernelversion	  - Output the version stored in Makefile
headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH
(default: /opt/ext4/usr)
checkstack      - Generate a list of stack hogs
namespacecheck  - Name space analysis on compiled kernel
versioncheck    - Sanity check on version.h usage
includecheck    - Check for duplicate included header files
export_report   - List the usages of all exported symbols
headers_check   - Sanity check on exported headers
headerdep       - Detect inclusion cycles in headers
coccicheck      - Check with Coccinelle.

Kernel packaging:
rpm-pkg             - Build both source and binary RPM kernel packages
binrpm-pkg          - Build only the binary kernel package
deb-pkg             - Build the kernel as an deb package
tar-pkg             - Build the kernel as an uncompressed tarball
targz-pkg           - Build the kernel as a gzip compressed tarball
tarbz2-pkg          - Build the kernel as a bzip2 compressed tarball
tarxz-pkg           - Build the kernel as a xz compressed tarball
perf-tar-src-pkg    - Build perf-2.6.39-rc3.tar source tarball
perf-targz-src-pkg  - Build perf-2.6.39-rc3.tar.gz source tarball
perf-tarbz2-src-pkg - Build perf-2.6.39-rc3.tar.bz2 source tarball
perf-tarxz-src-pkg  - Build perf-2.6.39-rc3.tar.xz source tarball

Documentation targets:
Linux kernel internal documentation in different formats:
htmldocs        - HTML
pdfdocs         - PDF
psdocs          - Postscript
xmldocs         - XML DocBook
mandocs         - man pages
installmandocs  - install man pages generated by mandocs
cleandocs       - clean all generated DocBook files

Architecture specific targets (x86):
* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)
install      - Install kernel using
(your) ~/bin/installkernel or
(distribution) /sbin/installkernel or
install to $(INSTALL_PATH) and run lilo
fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)
fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)
fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)
isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)
bzdisk/fdimage*/isoimage also accept:
FDARGS="..."  arguments for the booted kernel
FDINITRD=file initrd for the booted kernel

x86_64_defconfig         - Build for x86_64
i386_defconfig           - Build for i386

make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build
make V=2   [targets] 2 => give reason for rebuild of target
make O=dir [targets] Locate all output files in "dir", including .config
make C=1   [targets] Check all c source with $CHECK (sparse by default)
make C=2   [targets] Force check of all c source with $CHECK
make W=1   [targets] Enable extra gcc checks

Execute "make" or "make all" to build all targets marked with [*]
For further info see the ./README file
[root@btg ext4]#


[root@btg ext4]# make tags cscope
GEN     tags

GEN     cscope
[root@btg ext4]#

我自己生成的cscope和tags打开的内容

Cscope tag: start_kernel
   #   行    文件名 / 上下文 / 行
   1    135  arch/alpha/boot/bootp.c <<start_kernel>>
             start_kernel(void )
   2    263  arch/alpha/boot/bootpz.c <<start_kernel>>
             start_kernel(void )
   3    153  arch/alpha/boot/main.c <<start_kernel>>
             void start_kernel(void )
   4    456  init/main.c <<start_kernel>>
             asmlinkage void __init start_kernel(void )
Type number and <Enter> (empty cancels):

如果使用kernel的Makefile里的会直接进入到

   4 456 init/main.c <<start_kernel>>
             asmlinkage void __init start_kernel(void )
里面

非常方便