printk: fix loglevels as used by x86 stack dump code

[Alan Jenkins]

Following commit 5fd29d6 "printk: clean up handling of log-levels and newlines",
I noticed some loglevel oddities in my crash logs -

 Stack:
  00000020 dbe23e7c dbe23f8c c01a62bd 00000001 d759c400 dbc61840 00000000
  <0> 08088728 08088750 00000000 dbe23e74 dbe23ea4 00000000 00000000 00000000
  <0> dbe23c18 00c7afc0 c01a6eb1 ffffffff 00000000 dbc61840 00000000 00000000


This series is the result of my investigation.  The main fixes are

[PATCH 6/7] x86 dumpstack: fix printing of stack dump loglevels
 - fixes the problem shown above

[PATCH 5/7] printk: fix printk(KERN_EMERG) followed by printk("emergency message\n")
 - make sure the call trace which follows the stack dump is logged as KERN_EMERG,
   and not KERN_DEFAULT.

Regards
Alan
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