The dmesg command appears to be broken after the printk rework. The old
logic in the kdb code makes no sense in terms of current printk/logging
storage format, and KDB simply hangs forever upon entering 'dmesg'
The first patch revives the command by switching to kmsg_dumper iterator.
As a side-effect, the code is now much more simpler.
A few changes were needed in the printk.c: we needed unlocked variant
of the kmsg_dumper iterator, but these can surely wait for 3.6.
It's probably too late even for the first patch to go to 3.5, but
I'll try to convince otherwise. :-) Here we go:
- The current code is broken for sure, and has no hope to work at
all. It is a regression;
- The new code works for me, and probably works for everyone else;
- If it compiles (and I urge everyone to compile-test it on your
setup), it hardly can make things worse.
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