Bjorn Helgaas wrote: > On Monday 20 April 2009 07:35:40 pm Yinghai Lu wrote: >> it wil be overwriten later if _CRS is used, so don't bother to set it. >> >> [ Impact: cleanup ] >> >> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> >> >> --- >> arch/x86/pci/amd_bus.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> Index: linux-2.6/arch/x86/pci/amd_bus.c >> =================================================================== >> --- linux-2.6.orig/arch/x86/pci/amd_bus.c >> +++ linux-2.6/arch/x86/pci/amd_bus.c >> @@ -100,6 +100,10 @@ void x86_pci_root_bus_res_quirks(struct >> int j; >> struct pci_root_info *info; >> >> + /* don't go for it if _CRS is used */ >> + if (pci_probe & PCI_USE__CRS) >> + return; >> + >> /* if only one root bus, don't need to anything */ >> if (pci_root_num < 2) >> return; > > This isn't a comment on this patch per se. > > I am concerned about the fact that "pci=use_crs" is not the default. > From the changelog of 62f420f8282, it sounds like you have to boot an > IBM x3850 with "pci=use_crs" to make hot-plug work, even though ACPI > tells us everything we need to know. That's backwards. > > We shouldn't need an option to tell Linux that the firmware is > trustworthy. We should have an option to *ignore* it for the times > when we trip over something broken and haven't figured out a way to > work around it yet. other system may have broken _CRS. maybe we could try to use DMI whitelist them? YH -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
