linux-kernel - Re: [PATCH 7/12] acpi: fix another compile warning

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Date:	Wed, 20 Jun 2007 09:36:30 -0400
From:	Len Brown <lenb@...nel.org>
To:	"Andreas Herrmann" <andreas.herrmann3@....com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Andi Kleen <ak@...e.de>, Shai Fultheim <shai@...lex86.org>,
	Ravikiran Thirumalai <kiran@...lex86.org>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 7/12] acpi: fix another compile warning

On Wednesday 20 June 2007 04:49, Andreas Herrmann wrote:
> On Tue, Jun 19, 2007 at 11:38:02PM -0400, Len Brown wrote:
> > On Tuesday 19 June 2007 18:50, Andreas Herrmann wrote:
> > > Avoid compile warning if !ACPI_BLACKLIST_YEAR
> > > 
> > >   CC      drivers/acpi/blacklist.o
> > >   drivers/acpi/blacklist.c:76:5: warning: "CONFIG_ACPI_BLACKLIST_YEAR" is not defined
> > 
> > How were you able to produce a .config with CONFIG_ACPI_BLACKLIST_YEAR not defined?
> 
> Initially I used randconfig. But you can easily create it using
> "make menuconfig", too.
> 
> Just do "make mrproper && make menuconfig" and now
> deselect CONFIG_PM. On x86_64 ACPI keeps enabled by default.

As CONFIG_ACPI depends on CONFIG_PM, then if you are able to end up
with a config having ACPI && !PM, then the Kconfig system is broken.

The brokeness is x86_64 specific, and results from the "select ACPI" below.

Please test if this single patch fixes all your multiple ACPI related build errors.

I fear, however, that this patch defeats the purpose of 
b0bd35e622ffbda2c01dc67a0381c6a18817a29a -- which was to make selecting
NUMA more user-friendly.  So it might make more sense to simply revert that
patch entirely.

The underlying problem is that Kconfig doesn't support using select
on targets which themselves have dependencies.

Signed-off-by: Len Brown <len.brown@...el.com>


diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 5ce9443..e9d7767 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -364,9 +364,9 @@ config NODES_SHIFT
 config X86_64_ACPI_NUMA
        bool "ACPI NUMA detection"
        depends on NUMA
-       select ACPI 
+       depends on ACPI 
 	select PCI
-       select ACPI_NUMA
+       depends on ACPI_NUMA
        default y
        help
 	 Enable ACPI SRAT based node topology detection.
-
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