powerpc/fadump: register for fadump as early as possible
Crash recovery (fadump) is setup in the userspace by some service. This service rebuilds initrd with dump capture capability, if it is not already dump capture capable before proceeding to register for firmware assisted dump (echo 1 > /sys/kernel/fadump/registered). But arming the kernel with crash recovery support does not have to wait for userspace configuration. So, register for fadump while setting it up itself. This can at worst lead to a scenario, where /proc/vmcore is ready afer crash but the initrd does not know how/where to offload it, which is always better than not having a /proc/vmcore at all due to incomplete configuration in the userspace at the time of crash. Commit 0823c68b ("powerpc/fadump: re-register firmware-assisted dump if already registered") ensures this change does not break userspace. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> [mpe: Reword comment] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220201105305.155511-1-hbathini@linux.ibm.com
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