[ARM] Refine selection of ISA_DMA_API and generic dma.c code

ISA_DMA_API tells the rest of the kernel if the ISA DMA API is
available.  Select this symbol only on machine types which make
use of the ISA DMA API.

Make building of arch/arm/kernel/dma.c depend on this symbol -
if a machine does not support the ISA DMA API, it's pointless
building this file.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4b15f5f..cb41310 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -154,6 +154,7 @@ config ARCH_RPC
        select FIQ
        select TIMER_ACORN
        select ARCH_MAY_HAVE_PC_FDC
+       select ISA_DMA_API
        help
          On the Acorn Risc-PC, Linux can support the internal IDE disk and
          CD-ROM interface, serial and parallel port, and the floppy drive.
@@ -206,6 +207,7 @@ config ARCH_IMX
 
 config ARCH_H720X
        bool "Hynix-HMS720x-based"
+       select ISA_DMA_API
        help
          This enables support for systems based on the Hynix HMS720x
 
@@ -290,12 +292,14 @@ config ISA
          (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
          newer boards don't support it.  If you have ISA, say Y, otherwise N.
 
+# Select ISA DMA controller support
 config ISA_DMA
        bool
+       select ISA_DMA_API
 
+# Select ISA DMA interface
 config ISA_DMA_API
        bool
-       default y
 
 config PCI
        bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 25b14c3..de94b0f 100644 (file)
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -6,11 +6,12 @@ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
 
 # Object file lists.
 
-obj-y          := compat.o dma.o entry-armv.o entry-common.o irq.o \
+obj-y          := compat.o entry-armv.o entry-common.o irq.o \
                   process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
                   time.o traps.o
 
 obj-$(CONFIG_APM)              += apm.o
+obj-$(CONFIG_ISA_DMA_API)      += dma.o
 obj-$(CONFIG_ARCH_ACORN)       += ecard.o 
 obj-$(CONFIG_FOOTBRIDGE)       += isa.o
 obj-$(CONFIG_FIQ)              += fiq.o