RE: [PATCH] printk: fixing the deadlock when calling printk in nmihandle

[Liu, Chuansheng]

> Yuck.. and no. This makes sane things like early 8250 serial console less
> reliable.
Peter, could you share more? I took many time to dig out this issue.
Anyway, in nmi handler, calling printk is dangerous. This patch is for this case.
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