How to detect rebooting into kexec'd kernel

Philip Prindeville philipp_subx at redfish-solutions.com
Sat Mar 11 09:40:35 PST 2017


How do you tell you’re in the new kernel?

There doesn’t seem to be anything in /sys/kernel/ that indicates this.

I could parse /proc/cmdline for the absence of “crashkernel=“ for instance, but there are obvious pitfalls to that.

You’d think there would be a way for the kexec’d kernel to maintain some sort of marker making it obvious that this is the kexec’d kernel (especially if your system kernel and your crash kernel are the same, and only the cmdline arguments change).

Thanks,

-Philip




More information about the kexec mailing list