announce: kmsgdump update for 2.5.75

announce: kmsgdump update for 2.5.75

[Randy.Dunlap]

I've updated kmsgdump for Linux 2.5.75.  The patch is available at
  http://www.xenotime.net/linux/kmsgdump/2.5.75/

Unfortunately it's not working with Linux-2.6.0-test1 and I haven't
been able to determine why yet.  If someone could point out to me
what subtle x86 changes there were between 2.5.75 and 2.6.0-test1,
I'm listening, or even better, buying beers next week in Canada.
I've been thru the 2.5.75-to-2.6.0-test1 patch file a couple of
times without finding it, and still looking.

Thanks,
--
~Randy
| http://developer.osdl.org/rddunlap/ | http://www.xenotime.net/linux/ |

Re: announce: kmsgdump update for 2.5.75

[willy tarreau]

Hi Randy, all.

OK finally I tested 2.5.74, 2.5.75 and 2.6.0-test1 on a PIII/800. They
all allowed be to get to the interactive screen after Sysrq-D (eventhough
the keyboard was dead after that, as always on this crappy machine/bios).

I noticed that you had a #define KDEBUG which puts printk's at every
checkpoint. I wonder if it's not risky to do this within the last ones,
when the machine is nearly ready to reboot. I'm not sure if this could
work with serial consoles or frame buffer. Could you please retry with
#undef KDEBUG ?

BTW, I'm not certain that the current code is still totally compatible
with standard kernel reboot techniques. I've read through it rather
quickly and compare it to other functions such as machine_real_restart(),
etc... It may be possible that we have to stop/notify some subsystems
prior to this.

FYI, on this machine, I enabled ACPI and local APIC, but disabled preempt.
Unfortunately, I don't have enough time to recheck with different combinations
of these options.

Hoping this helps a bit...

Cheers,
Willy


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