diff options
| author | Alexander Graf <graf@amazon.com> | 2023-12-07 23:56:54 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-15 17:23:00 +0100 |
| commit | 2678fd2fe9ee2c569e9cb6b17e786bc8f0753538 (patch) | |
| tree | 39376d0d83d700190d27c1f48b3103edf4b96807 /init/do_mounts.h | |
| parent | 5133bee62f0ea5d4c316d503cc0040cac5637601 (diff) | |
initramfs: Expose retained initrd as sysfs file
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.
With this patch applied, there is a new /sys/firmware/initrd file when
the kernel was booted with an initrd and "retain_initrd" command line
option 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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init/do_mounts.h')
0 files changed, 0 insertions, 0 deletions