centos获取内核源代码

centos中默认的内核源码路径为 /usr/src/`uname -r`，但是它不包含源码，只包含了Kconfig 和 Makefile
按照centos的wiki整理一份完整源码获取办法


1. 首先安装（升级）一些依赖包：
sudo yum install rpm-build redhat-rpm-config asciidoc hmaccalc perl-ExtUtils-Embed pesign xmlto
sudo yum install audit-libs-devel binutils-devel elfutils-devel elfutils-libelf-devel
sudo yum install ncurses-devel newt-devel numactl-devel pciutils-devel python-devel zlib-devel


2. 创建源码的编译目录树，目的源码存放地址
mkdir -p ~/rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}
echo '%_topdir %(echo $HOME)/rpmbuild' > ~/.rpmmacros


3. 找到你的centos对应的内核源码包
可用 cat /etc/redhat-release 得到centos版本是7.1.1503  


然后从centos的官网上下载7.1.1503版本的内核源码包
http://vault.centos.org/7.1.1503/updates/Source/SPackages/
kernel-3.10.0-229.20.1.el7.src.rpm


4. 安装到编译目录
rpm -i kernel-3.10.0-229.20.1.el7.src.rpm 2>&1 | grep -v exist
cd ~/rpmbuild/SPECS
rpmbuild -bp --target=$(uname -m) kernel.spec


最终的内核源码应该在
~/rpmbuild/BUILD/kernel-*/linux-*/