On Friday 15 May 2009 04:03:49 pm Yinghai Lu wrote:
> Bjorn Helgaas wrote:
> > On Friday 15 May 2009 03:13:20 pm Yinghai Lu wrote:
> >> Bjorn Helgaas wrote:
> >>> On Friday 15 May 2009 01:51:56 pm Yinghai Lu wrote:
> >>>> to get all device irq routing and save them
> >>> This changelog isn't really enough for me to understand
> >>> what's going on.
> >>>
> >>>> Index: linux-2.6/arch/x86/kernel/mpparse.c
> >>>> ===================================================================
> >>>> --- linux-2.6.orig/arch/x86/kernel/mpparse.c
> >>>> +++ linux-2.6/arch/x86/kernel/mpparse.c
> >>>> @@ -17,6 +17,7 @@
> >>>> #include <linux/acpi.h>
> >>>> #include <linux/module.h>
> >>>> #include <linux/smp.h>
> >>>> +#include <linux/pci.h>
> >>>>
> >>>> #include <asm/mtrr.h>
> >>>> #include <asm/mpspec.h>
> >>>> @@ -961,6 +962,7 @@ static int __initdata enable_update_mpta
> >>>> static int __init update_mptable_setup(char *str)
> >>>> {
> >>>> enable_update_mptable = 1;
> >>>> + pci_routeirq = 1;
> >>> I hate to see new uses of pci_routeirq. It'd be nice to remove it
> >>> completely someday. But maybe it can't be helped.
> >>>
> >>>> return 0;
> >>>> }
> >>>> early_param("update_mptable", update_mptable_setup);
> >>> "update_mptable" is apparently a boot option, but it's not mentioned
> >>> in Documentation/kernel-parameters.txt. Is this some sort of debug
> >>> code or BIOS-writer's helper? Same with "alloc_mptable". Why do
> >>> we have this stuff?
> >>>
> >> 1. kexec path: after acpi kernel and use kexec to load kerenl with mptable support only or acpi=off
> >> 2. help to BIOS engineer to understand how to set mptable and irq routing setup by chipset.
> >> esp system have several cards and there is bridge in those cards.
> ...
> > Is (1) common enough to worry about? What OSes don't have ACPI
> > support? What advantage is there to using "acpi=off"?
> ...
>
> some one want to disable acpi, because acpid is using 100%...
I'd rather fix the problem with acpid than make it easier to
use "acpi=off".
Bjorn
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