RE: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

>> There's a logbuf_lock in printk. If logbuf_lock is held by other cpu,
>> it'll lead to an infinity spin here. Isn't it?
>
> Yes, but we want to take the risk and print something out before the
> machine dies instead of waiting to get into printk-safe context first
> and maybe corrupt state.

Not all machine checks are fatal - it would be bad for us to go into an
infinite spin instead of executing the recovery code.

> Besides, there's work currently going on to make printk safe in atomic
> context so...

Good - we need this.

-Tony