en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/sysfs-firmware-initrd#2678fd2f initramfs: Expose retained initrd as sysfs fileWhen the kernel command line option "retain_initrd" is set, we do notfree the initrd memory. However, we also don't expose it to anyone forconsumption. That leaves us in a weird situation where the only user ofthis feature is ppc64 and arm64 specific kexec tooling.To make it more generally useful, this patch adds a kobject to thefirmware object that contains the initrd context when "retain_initrd"is set. That way, we can access the initrd any time after boot fromuser space and for example hand it into kexec as --initrd parameterif we want to reboot the same initrd. Or inspect it directly locally.With this patch applied, there is a new /sys/firmware/initrd file whenthe kernel was booted with an initrd and "retain_initrd" command lineoption is set.Signed-off-by: Alexander Graf <graf@amazon.com>Tested-by: Bagas Sanjaya <bagasdotme@gmail.com>Link: https://lore.kernel.org/r/20231207235654.16622-1-graf@amazon.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/Documentation/ABI/testing/sysfs-firmware-initrd Thu, 07 Dec 2023 23:56:54 +0000 Alexander Graf <graf@amazon.com>