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.
I was sort of hoping for a Documentation/kernel-parameters.txt patch.
Is (1) common enough to worry about? What OSes don't have ACPI
support? What advantage is there to using "acpi=off"?
(2) sounds like something that should be under a config option, if
it's in the mainline kernel at all.
Bjorn
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