Re: problems with volunteer preempt patch WAS: little NPTL SCHED_FIFO test program

[martin rumori <lists@rumori.de>]

On Fri, Aug 20, 2004 at 05:42:59AM -0400, Lee Revell wrote:
> On Fri, 2004-08-20 at 05:20, martin rumori wrote:
> > tried to compile 2.6.8.1 with volunteer-preempt-P5 (latest), but
> > wasn't able to boot into the new kernel.  shows some lines of ACPI....

> I think you have an off-by-one error.  The latest version is -P4.

o.k., you're right.  this time it's really -P5 :-)

> Try the 'noacpi' boot option.  Also, try disabling all power
> management.  I know this is not realistic for a laptop, it's just for
> debugging purposes.

tried it with the options, no success.  built a kernel without
powermanagement and without cpu speedstep at all.  exactly the same
behavior, directly after unpacking the kernel at the beginning of
startup:

0 MB highmem
511 mb lowmem available

ACPI RSDP .....
.....
ACPI build 1 zone list
Detected Processor...
Memory ...
...
Checking if processor honors the WP bit even in supervisor mode... ok.

---
that's it.  freezes for 1-2 seconds after this last message, then
reboots.  tried to write down these contents of the screen, as far as
i could recognize them during the short period of time.

i am wondering especially about the ACPI messages, as ACPI is
completely switched off now.

second (minor) issue: when having enabled CONFIG_PREEMPT_VOLUNTARY(=y)
but not CONFIG_PREEMPT_TIMING(=n), i get the following when linking:

  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/i386/kernel/built-in.o(.text+0x2da1): In function `do_nmi':
: undefined reference to `__trace'
arch/i386/kernel/built-in.o(.text+0x342c): In function `do_IRQ':
: undefined reference to `__trace'
arch/i386/mm/built-in.o(.text+0x705): In function `do_page_fault':
: undefined reference to `__trace'
make: *** [.tmp_vmlinux1] Error 1

maybe latency.o is not included when linking without
CONFIG_PREEMPT_TIMING?

bests,

martin