linux-kernel - [patch 2/4] x86: only compile 8237A if CONFIG_ISA_DMA

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Message-ID: <alpine.DEB.2.00.1101261913060.7809@chino.kir.corp.google.com>
Date:	Wed, 26 Jan 2011 19:14:47 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
cc:	Adam Belay <abelay@....edu>, Bjorn Helgaas <bjorn.helgaas@...com>,
	Russell King <linux@....linux.org.uk>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [patch 2/4] x86: only compile 8237A if CONFIG_ISA_DMA_API is
 enabled

8237A utilizes the interface provided by CONFIG_ISA_DMA_API, specifically
claim_dma_lock() and release_dma_lock().  Thus, there's a strict
dependency on the config option and the module should only be loaded if
the kernel supports ISA-style DMA.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 arch/x86/kernel/Makefile |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -41,12 +41,13 @@ obj-$(CONFIG_X86_32)	+= sys_i386_32.o i386_ksyms_32.o
 obj-$(CONFIG_X86_64)	+= sys_x86_64.o x8664_ksyms_64.o
 obj-$(CONFIG_X86_64)	+= syscall_64.o vsyscall_64.o
 obj-y			+= bootflag.o e820.o
-obj-y			+= pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
+obj-y			+= pci-dma.o quirks.o topology.o kdebugfs.o
 obj-y			+= alternative.o i8253.o pci-nommu.o hw_breakpoint.o
 obj-y			+= tsc.o io_delay.o rtc.o
 obj-y			+= pci-iommu_table.o
 obj-y			+= resource.o
 
+obj-$(CONFIG_ISA_DMA_API)	+= i8237.o
 obj-$(CONFIG_X86_TRAMPOLINE)	+= trampoline.o
 obj-y				+= process.o
 obj-y				+= i387.o xsave.o
--
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