Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot

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From: Eric Piel
Date: Monday, March 24, 2008 - 10:05 am

Pavel Machek wrote:
Why do you think it's necessary to turn off acpi mode? What will not 
work if we keep it on all the time?

BTW, let me summarize my understanding of the kexec approach:
* the userspace write the new DSDT (cat my-dsdt-image > 
/sys/firmware/acpi/tables/DSDT)
* the kernel don't use this DSDT directly but keeps it somewhere warm 
and fuzzy in the RAM
* userspace does a kexec
* the new kernel boots and at some (early) point, dsdt_override() is 
called. It detects that the special place in the RAM for a new DSDT is 
used. It provides this pointer to ACPI as the new place to read the DSDT.

Dave, am I correctly understanding the scenario you had in mind?

I have pratically no knowledge of kexec. Is there a documented way to 
pass big chunk of data from one kernel to another one? How can I do that?

Eric
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Messages in current thread:
2.6.25-rc5-mm1, Andrew Morton, (Tue Mar 11, 1:14 am)
[Build Faliure] 2.6.25-rc5-mm1 build fails , Kamalesh Babulal, (Tue Mar 11, 3:16 am)
Re: [Build Faliure] 2.6.25-rc5-mm1 build fails, Edward Shishkin, (Tue Mar 11, 3:56 am)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Randy Dunlap, (Tue Mar 11, 10:09 am)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Jeremy Fitzhardinge, (Tue Mar 11, 11:18 am)
Re: [Build Failure] 2.6.25-rc5-mm1 Build fails with allmod ..., Bartlomiej Zolnierki ..., (Tue Mar 11, 12:35 pm)
Re: [Build Failure] 2.6.25-rc5-mm1 Build fails with allmod ..., Bartlomiej Zolnierki ..., (Tue Mar 11, 12:36 pm)
Re: 2.6.25-rc5-mm1, serge, (Tue Mar 11, 1:23 pm)
Re: 2.6.25-rc5-mm1, Andrew Morton, (Tue Mar 11, 1:39 pm)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Ravikiran G Thirumalai, (Tue Mar 11, 5:10 pm)
Re: 2.6.25-rc5-mm1, Dave Young, (Tue Mar 11, 6:14 pm)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Randy Dunlap, (Tue Mar 11, 6:42 pm)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Jeremy Fitzhardinge, (Tue Mar 11, 6:51 pm)
Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI), Ingo Molnar, (Wed Mar 12, 12:14 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem ?, Badari Pulavarty, (Wed Mar 12, 11:10 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem ?, Andrew Morton, (Wed Mar 12, 11:15 am)
Re: 2.6.25-rc5-mm1, Torsten Kaiser, (Wed Mar 12, 12:33 pm)
Re: 2.6.25-rc5-mm1, Andrew Morton, (Wed Mar 12, 12:44 pm)
Re: 2.6.25-rc5-mm1, Torsten Kaiser, (Wed Mar 12, 1:01 pm)
Re: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 ..., Benjamin Herrenschmidt, (Wed Mar 12, 1:40 pm)
[2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot, Tilman Schmidt, (Wed Mar 12, 4:54 pm)
[2.6.25-rc5-mm1] WARNING: at drivers/base/sys.c:173, Tilman Schmidt, (Wed Mar 12, 5:15 pm)
Re: 2.6.25-rc5-mm1 shutdown crash, Helge Hafting, (Thu Mar 13, 7:03 am)
Re: 2.6.25-rc5-mm1 shutdown crash, Andrew Morton, (Thu Mar 13, 9:12 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem with git-sched.patch, Badari Pulavarty, (Thu Mar 13, 10:09 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem with git-sched.patch, Badari Pulavarty, (Thu Mar 13, 10:40 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem with git-sched.patch, Guillaume Chazarain, (Thu Mar 13, 10:55 am)
Re: 2.6.25-rc5-mm1 - x86_64 boot problem with git-sched.patch, Badari Pulavarty, (Thu Mar 13, 11:20 am)
Re: 2.6.25-rc5-mm1, Torsten Kaiser, (Thu Mar 13, 3:05 pm)
Re: 2.6.25-rc5-mm1: "consolechars" hangs on boot, Laurent Riffard, (Thu Mar 13, 3:07 pm)
Re: 2.6.25-rc5-mm1, Andrew Morton, (Thu Mar 13, 3:35 pm)
Re: 2.6.25-rc5-mm1, Badari Pulavarty, (Thu Mar 13, 4:10 pm)
Re: [2.6.25-rc5-mm1] WARNING: at drivers/base/sys.c:173, Tilman Schmidt, (Thu Mar 13, 5:01 pm)
Re: 2.6.25-rc5-mm1: "consolechars" hangs on boot, Oleg Nesterov, (Thu Mar 13, 10:26 pm)
Re: [2.6.25-rc5-mm1] WARNING: at drivers/base/sys.c:173, Tilman Schmidt, (Fri Mar 14, 2:58 am)
Re: 2.6.25-rc5-mm1: "consolechars" hangs on boot, Laurent Riffard, (Fri Mar 14, 2:06 pm)
Re: [2.6.25-rc5-mm1] WARNING: at drivers/base/sys.c:173, Tilman Schmidt, (Sat Mar 15, 5:16 am)
Re: 2.6.25-rc5-mm1 build failure of pcsp.c, Mariusz Kozlowski, (Sun Mar 16, 2:38 pm)
Re: [2.6.25-rc5-mm1] regression: cannot run Postfix sendma ..., Rafael J. Wysocki, (Thu Mar 20, 3:21 am)
Re: [2.6.25-rc5-mm1] regression: cannot run Postfix sendma ..., Rafael J. Wysocki, (Thu Mar 20, 7:38 am)
Re: 2.6.25-rc5-mm1, Ingo Molnar, (Fri Mar 21, 5:12 am)
Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot, Eric Piel, (Mon Mar 24, 10:05 am)
Re: 2.6.25-rc5-mm1 shutdown crash, Helge Hafting, (Tue Mar 25, 5:23 am)
Re: 2.6.25-rc5-mm1 sparc64 boot problems due to generic pc ..., Mariusz Kozlowski, (Fri Mar 28, 3:52 pm)
Re: 2.6.25-rc5-mm1 sparc64 boot problems due to generic pc ..., Benjamin Herrenschmidt, (Fri Mar 28, 5:44 pm)