[origin tree boot hang] [PATCH] Revert "early_printk: Allow morethan one early console"

[Ingo Molnar]

>       early_printk: Allow more than one early console

this patch broke things pretty badly on x86, with pretty much any 
config, as long as the early console is used - which most of my 
test-systems do :-(

I'm getting an early boot hard lockup, which is due to an infinite 
stream of:

[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
[    0.000000]  BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
[    0.000000]  BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
[    0.000000]  BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
[    0.000000] console [earlyser0] enabled
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpuset
[ ... ]

i've reverted it via the patch below, as it clearly has unintended side 
effects.

	Ingo