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SubjectRe: x86 git acpi issue?
On Fri, May 02, 2008 at 05:08:12PM -0700, H. Peter Anvin wrote:
> Hiroshi Shimamoto wrote:
>> Hi,
>>
>> commit: afcab879e4044f952b7a031d5fd504e0feb7df41
>> visws: build fix
>>
>> breaks something around acpi on 32bit.
>> In my test box scsi driver complains and the kernel doesn't boot.
>>
>> I'm not sure, but when moving the acpi.o before legacy.o, it works.
>> --- a/arch/x86/pci/Makefile_32
>> +++ b/arch/x86/pci/Makefile_32
>> @@ -6,11 +6,11 @@ obj-$(CONFIG_PCI_DIRECT) += direct.o
>> obj-$(CONFIG_PCI_OLPC) += olpc.o
>> pci-y := fixup.o
>> +pci-$(CONFIG_ACPI) += acpi.o
>> pci-y += legacy.o irq.o
>> pci-$(CONFIG_X86_VISWS) := visws.o fixup.o
>> pci-$(CONFIG_X86_NUMAQ) := numa.o irq.o
>> -pci-$(CONFIG_ACPI) += acpi.o
>> pci-$(CONFIG_NUMA) += mp_bus_to_node.o
>> obj-y += $(pci-y) common.o early.o
>>
>> of cause this isn't correct patch, it's just a workaround for me.
>>
>
> The problem is that := should be += for the VISWS and NUMAQ lines. There
> is already a patch queued up to fix that.

Commit afcab879e4044f952b7a031d5fd504e0feb7df41 is the commit where Ingo
both _reverts_ his patch you describe in the x86 tree and additionally
moves pci-$(CONFIG_ACPI) in exactly the way that causes this breakage.

In the 4 hours between Ingo doing the += change and Ingo reverting his
own patch in the x86 tree it was in a pull request to Linus, so the
"queued up" patch is in Linus' tree but reverted in the x86 tree.

I saw neither the patch changing the :='s to += on linux-kernel nor does
"do not override the existing pci-y rule when adding visws or numaq
rules." in the commit description give any indication what the actual
problem was.

It's also not obvious why the revert with the subject "visws: build fix"
also moved the pci-$(CONFIG_ACPI) causing this bug here.

> -hpa

cu
Adrian

--

"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed



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