linux-kernel - [patch x86/acpi] ACPI: Fix build when disabled

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Date:	Mon, 1 Oct 2012 20:38:47 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	tglx@...utronix.de
cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>, Len Brown <lenb@...nel.org>,
	Eric Piel <eric.piel@...mplin-utc.net>,
	Thomas Renninger <trenn@...e.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Robert Moore <robert.moore@...el.com>
Subject: [patch x86/acpi] ACPI: Fix build when disabled

"ACPI: Store valid ACPI tables passed via early initrd in reserved 
memblock areas" breaks the build if either CONFIG_ACPI or 
CONFIG_BLK_DEV_INITRD is disabled:

arch/x86/kernel/setup.c: In function 'setup_arch':
arch/x86/kernel/setup.c:944: error: implicit declaration of function 'acpi_initrd_override'

or

arch/x86/built-in.o: In function `setup_arch':
(.init.text+0x1397): undefined reference to `initrd_start'
arch/x86/built-in.o: In function `setup_arch':
(.init.text+0x139e): undefined reference to `initrd_end'

The dummy acpi_initrd_override() function in acpi.h isn't defined without 
CONFIG_ACPI and initrd_{start,end} are declared but not defined without 
CONFIG_BLK_DEV_INITRD.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 arch/x86/kernel/setup.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -941,7 +941,9 @@ void __init setup_arch(char **cmdline_p)
 
 	reserve_initrd();
 
+#if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
 	acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
+#endif
 
 	reserve_crashkernel();
 
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