On Tue, January 16, 2007 11:56, Ingo Molnar wrote:

* Rui Nuno Capela [off-list ref] wrote:

quoted

First one is about building for UP (CONFIG_SMP not set) on my old P4
laptop. As it seems, all my build attempts failed at the final link
stage, with undefined references to paravirt_enable. After disabling
CONFIG_PARAVIRT I get a similar failure, but this time for a couple
kvm* symbols. [...]

ok, i think i have managed to fix both bugs. I have released -rt3,
please re-check whether it works any better. If it still doesnt then
please send me the exact .config that fails.

Building this already with -rt5, still gives:
...
  LD      arch/i386/boot/compressed/vmlinux
  OBJCOPY arch/i386/boot/vmlinux.bin
  BUILD   arch/i386/boot/bzImage
Root device is (3, 2)
Boot sector 512 bytes.
Setup is 7407 bytes.
System is 1427 kB
Kernel: arch/i386/boot/bzImage is ready  (#1)
WARNING: "profile_hits" [drivers/kvm/kvm-intel.ko] undefined!
WARNING: "profile_hits" [drivers/kvm/kvm-amd.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
...

.config as .gz is attached.

quoted

Second one is already about running SMP, on a Dual Core2 T7200, for
which the build goes fine but run-time is haunted by a crippling BUG:

quoted

Call Trace:
[<c0102dad>] __switch_to+0xcc/0x176
[<c01185c8>] wake_up_process+0x19/0x1b
[<c01fe568>] acpi_ec_gpe_handler+0x1f/0x53
[<c01ec6c6>] acpi_ev_gpe_dispatch+0x64/0x163
[<c01eca06>] acpi_ev_gpe_detect+0x94/0xd7

hm, this is a -rt specific thing that i hoped to have worked around but
apparently not. The ACPI code uses a waitqueue in its idle routine
(argh!) which cannot by done sanely on PREEMPT_RT. In -rt3 i've added
a more conservative (but still ugly and incorrect) hack - could you try
it, does -rt3 work any better?

Yes it does. No BUG has been spotted on -rt3, yet.

Cheers.
-- 
rncbc aka Rui Nuno Capela
rncbc@rncbc.org