Linux Kernel 4.2 已经发布了，这是 Linus Torvalds 近期发布的最大的一个版本，增加了超过100万行代码，移除了大约25万行代码。主要新特性包括：新的AMDGPU驱动；Intel Broxton支持；改进NCQ TRIM处理；F2FS文件系统加密；重写了部分英特尔x86汇编代码；LSM Stacking；延迟梯度网络拥堵控制算法；改进控制组的回写管理等等。
以下内容来自邮件列表：
So judging by how little happened this week, it wouldn’t have been a mistake to release 4.2 last week after all, but hey, there’s certainly a few fixes here, and it’s not like delaying 4.2 for a week should have caused any problems either.
So here it is, and the merge window for 4.3 is now open. I already have a few pending early pull requests, but as usual I’ll start processing them tomorrow and give the release some time to actually sit.
安装说明。
Ubuntu 系统用户安装，ubuntu 提供了 DEB 安装包，下载地址：kernel.ubuntu.com，你也可以使用以下命令安装。
32位用户：
下载安装包命令：
cd /tmp
wget
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-headers-4.2.0-040200_4.2.0-040200.201508301530_all.deb
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-headers-4.2.0-040200-generic_4.2.0-040200.201508301530_i386.deb
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-image-4.2.0-040200-generic_4.2.0-040200.201508301530_i386.deb
安装 Kernel：
sudo dpkg -i linux-headers-4.2*.deb linux-image-4.2*.deb
卸载 kernel：
sudo apt-get remove linux-header-4.2* linux-image-4.2*
64位用户：
下载安装包命令：
cd /tmp
wget
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-headers-4.2.0-040200_4.2.0-040200.201508301530_all.deb
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-headers-4.2.0-040200-generic_4.2.0-040200.201508301530_amd64.deb
kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-unstable/linux-image-4.2.0-040200-generic_4.2.0-040200.201508301530_amd64.deb
安装 Kernel：
sudo dpkg -i linux-headers-4.2*.deb linux-image-4.2*.deb
卸载 kernel：
sudo apt-get remove linux-header-4.2* linux-image-4.2*
CentOS 7 用户安装
su root
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install
yum --enablerepo=elrepo-kernel install kernel-ml
reboot
卸载 kernel 4.2
yum remove kernel-ml
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