On Wed, 6 Dec 2023 14:16:27 +0000 Alexander Graf <graf@xxxxxxxxxx> wrote: > When the kernel command line option "retain_initrd" is set, we do not > free the initrd memory. However, we also don't expose it to anyone for > consumption. That leaves us in a weird situation where the only user of > this feature is ppc64 and arm64 specific kexec tooling. > > To make it more generally useful, this patch adds a kobject to the > firmware object that contains the initrd context when "retain_initrd" > is set. That way, we can access the initrd any time after boot from > user space and for example hand it into kexec as --initrd parameter > if we want to reboot the same initrd. Or inspect it directly locally. I think it would be helpful if the changelog were mention and describe the new /sys/firmware/initrd. And I assume we should add a Documentation/ABI/testing/sysfs-firmware-initrd.
