linux-kernel - Re: 2.6.23-rc6-mm1

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Date:	Tue, 18 Sep 2007 19:05:25 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Miles Lane <miles.lane@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc6-mm1

On (18/09/07 13:20), Miles Lane didst pronounce:
>   LD      .tmp_vmlinux1
> drivers/built-in.o: In function `acpi_ac_remove':
> ac.c:(.text+0x3eeec): undefined reference to `power_supply_unregister'
> drivers/built-in.o: In function `acpi_ac_add':
> ac.c:(.text+0x3f10b): undefined reference to `power_supply_register'
> make: *** [.tmp_vmlinux1] Error 1
> 

Hi Miles,

The problem appears to be that ACPI_AC is compiled in but POWER_SUPPLY is
a module. You could workaround it by making them both modules but I believe
the root cause may be a dependency problem. I've included a patch below that
when you apply and run make oldconfig should allow you to build your kernel.

ACPI folks, is this a fix? If so, there may be other dependency issues that
allow a compiled-in feature to depend on a module.

Signed-off-by: Mel Gorman <mel@....ul.ie>

---
 Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc6-mm1-015_fix_ia64_kgdb/drivers/acpi/Kconfig linux-2.6.23-rc6-mm1-020_fix_acpi/drivers/acpi/Kconfig
--- linux-2.6.23-rc6-mm1-015_fix_ia64_kgdb/drivers/acpi/Kconfig	2007-09-11 03:50:29.000000000 +0100
+++ linux-2.6.23-rc6-mm1-020_fix_acpi/drivers/acpi/Kconfig	2007-09-18 19:03:32.000000000 +0100
@@ -88,7 +88,7 @@ config ACPI_PROC_EVENT
 
 config ACPI_AC
 	tristate "AC Adapter"
-	depends on X86
+	depends on X86 && POWER_SUPPLY
 	default y
 	help
 	  This driver adds support for the AC Adapter object, which indicates
-
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