Got it! thx! On Thu, May 28, 2015 at 11:43 AM, <[email protected]> wrote:
> On Thu, 28 May 2015 11:26:02 +0800, Gao Peng said: > > > > I am not sure if I boot from the old kernel,will the old kernel load the > > new-installed modules or keep it's own modules. > > If you did it properly, then you should have 2 kernels, each with a > distinct value for uname -r, and 2 directories under /lib/modules, one > for each kernel. Each kernel then proceeds to load modules from > /lib/modules/`uname -r`. > > So if you have a 3.19.0 kernel, and a 4.0.1 kernel, they'll both be > sitting in /boot (each with its own initramfs, probably), and > the 3.19.0 will load from /lib/modules/3.19.0 and the 4.0.1 will load > from /lib/modules/4.0.1 > > And, of course, you hopefully have grub/grub2/whatever configured to allow > you to select a kernel by having multiple definition stanzas, one per > kernel... > > Extreme example (I keep a *lot* of kernels around because I keep breaking > them): > > [~] ls /boot/vmlinuz-[34]* > /boot/vmlinuz-3.17.0-0.rc6.git2.1.fc22.x86_64 > /boot/vmlinuz-4.0.0-rc3-next-20150310-dirty > /boot/vmlinuz-3.18.0-0.rc3.git0.1.fc22.x86_64 > /boot/vmlinuz-4.0.0-rc5-next-20150324 > /boot/vmlinuz-3.19.0-0.rc3.git2.1.fc22.x86_64 > /boot/vmlinuz-4.0.0-rc6-next-20150331 > /boot/vmlinuz-4.0.0-next-20150421 > /boot/vmlinuz-4.1.0-rc1-next-20150428 > /boot/vmlinuz-4.0.0-rc1-next-20150224 > /boot/vmlinuz-4.1.0-rc2-next-20150506 > /boot/vmlinuz-4.0.0-rc1-next-20150226-dirty > /boot/vmlinuz-4.1.0-rc4-next-20150521 > /boot/vmlinuz-4.0.0-rc1-next-20150303-dirty > /boot/vmlinuz-4.1.0-rc5-next-20150526 > /boot/vmlinuz-4.0.0-rc2-next-20150306-dirty > [~] ls /boot/initramfs-[34]* > /boot/initramfs-3.17.0-0.rc6.git2.1.fc22.x86_64.img > /boot/initramfs-4.0.0-rc3-next-20150310-dirty.img > /boot/initramfs-3.18.0-0.rc3.git0.1.fc22.x86_64.img > /boot/initramfs-4.0.0-rc5-next-20150324.img > /boot/initramfs-3.19.0-0.rc3.git2.1.fc22.x86_64.img > /boot/initramfs-4.0.0-rc6-next-20150331.img > /boot/initramfs-4.0.0-next-20150421.img > /boot/initramfs-4.1.0-rc1-next-20150428.img > /boot/initramfs-4.0.0-rc1-next-20150224.img > /boot/initramfs-4.1.0-rc2-next-20150506.img > /boot/initramfs-4.0.0-rc1-next-20150226-dirty.img > /boot/initramfs-4.1.0-rc4-next-20150521.img > /boot/initramfs-4.0.0-rc1-next-20150303-dirty.img > /boot/initramfs-4.1.0-rc5-next-20150526.img > /boot/initramfs-4.0.0-rc2-next-20150306-dirty.img > [~] ls /lib/modules > 3.17.0-0.rc6.git2.1.fc22.x86_64 4.0.0-rc1-next-20150224 > 4.0.0-rc3-next-20150310-dirty 4.1.0-rc2-next-20150506 > 3.18.0-0.rc3.git0.1.fc22.x86_64 4.0.0-rc1-next-20150226-dirty > 4.0.0-rc5-next-20150324 4.1.0-rc4-next-20150521 > 3.19.0-0.rc3.git2.1.fc22.x86_64 4.0.0-rc1-next-20150303-dirty > 4.0.0-rc6-next-20150331 4.1.0-rc5-next-20150526 > 4.0.0-next-20150421 4.0.0-rc2-next-20150306-dirty > 4.1.0-rc1-next-20150428 > > Hope that helps it make sense... >
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