Re: [ACPI] 2.6.14-rc4 ACPI/PCI compile problem

From: Matthew Wilcox
Date: Wed Oct 12 2005 - 13:01:18 EST

On Tue, Oct 11, 2005 at 05:17:01PM -0600, Bjorn Helgaas wrote:
> Please try the following patch and confirm whether it works.
> [i386 kbuild] Don't clobber pci-y when X86_VISWS or X86_NUMAQ
> Previously, enabling CONFIG_X86_VISWS or CONFIG_X86_NUMAQ
> clobbered any previous contents of pci-y, because they used
> ":=" instead of "+=".

This isn't correct. We want to get rid of some of the current contents
of pci-y when NUMAQ or VISWS are enabled. I'm not quite sure what the
right fix is here. Maybe something like ...

--- arch/i386/pci/Makefile 14 Sep 2005 12:54:20 -0000 1.3
+++ arch/i386/pci/Makefile 12 Oct 2005 17:51:19 -0000
@@ -4,11 +4,11 @@ obj-$(CONFIG_PCI_BIOS) += pcbios.o
obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o
obj-$(CONFIG_PCI_DIRECT) += direct.o

-pci-y := fixup.o
-pci-$(CONFIG_ACPI) += acpi.o
-pci-y += legacy.o irq.o
+acpi-$(CONFIG_ACPI) := acpi.o
+pci-y := fixup.o $(acpi-y) legacy.o irq.o

pci-$(CONFIG_X86_VISWS) := visws.o fixup.o
-pci-$(CONFIG_X86_NUMAQ) := numa.o irq.o
+pci-$(CONFIG_X86_NUMAQ) := numa.o $(acpi-y) irq.o

obj-y += $(pci-y) common.o

This mess really needs some more eyes on it. For example, should fixups.o
really be enabled on visws but disabled on numaq? I suspect both want
legacy.o disabled. Does it make sense to enable ACPI on a NUMAQ system?
I don't know enough about them.

And it /really/ needs some commentary. Here's my first cut at it, based
on my memories of editing it several years ago:

# A little more complex than most Makefiles.
# Neither the VISWS nor the NUMAQ configs want to see legacy.o compiled in.
# VISWS doesn't have ACPI to worry about, but NUMAQ might
# Order is important -- don't rearrange the order of files here.

Help most gratefully received from people who really understand these boxes!
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