[PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO_BUS

[Stephen Rothwell]

Make if easier for more architectures to select it and thus disable
drivers that use virt_to_bus().

Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
---
 arch/Kconfig         |    7 +++++++
 arch/powerpc/Kconfig |    4 +---
 arch/sh/Kconfig      |    4 +---
 arch/sparc/Kconfig   |    4 +---
 4 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 366ec06..9bc00e7 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -271,6 +271,13 @@ config ARCH_WANT_OLD_COMPAT_IPC
 	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 	bool
 
+config ARCH_NO_VIRT_TO_BUS
+	bool
+	help
+	  An architecture should select this if it cannot (or will not)
+	  implement virt_to_bus().  All new architectures should probably
+	  select this.
+
 config GENERIC_KERNEL_THREAD
 	bool
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a902a5c..8c8fcba 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -87,9 +87,6 @@ config GENERIC_GPIO
 	help
 	  Generic GPIO API support
 
-config ARCH_NO_VIRT_TO_BUS
-	def_bool PPC64
-
 config PPC
 	bool
 	default y
@@ -101,6 +98,7 @@ config PPC
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select SYSCTL_EXCEPTION_TRACE
 	select ARCH_WANT_OPTIONAL_GPIOLIB
+	select ARCH_NO_VIRT_TO_BUS if PPC64
 	select HAVE_IDE
 	select HAVE_IOREMAP_PROT
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index babc2b8..9b28793 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -16,6 +16,7 @@ config SUPERH
 	select HAVE_DEBUG_BUGVERBOSE
 	select ARCH_HAVE_CUSTOM_GPIO_H
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
+	select ARCH_NO_VIRT_TO_BUS
 	select PERF_USE_VMALLOC
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_KERNEL_GZIP
@@ -150,9 +151,6 @@ config ARCH_HAS_ILOG2_U32
 config ARCH_HAS_ILOG2_U64
 	def_bool n
 
-config ARCH_NO_VIRT_TO_BUS
-	def_bool y
-
 config ARCH_HAS_DEFAULT_IDLE
 	def_bool y
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 9f2edb5..594d9bc 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -21,6 +21,7 @@ config SPARC
 	select SYSCTL_EXCEPTION_TRACE
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+	select ARCH_NO_VIRT_TO_BUS
 	select RTC_CLASS
 	select RTC_DRV_M48T59
 	select HAVE_IRQ_WORK
@@ -143,9 +144,6 @@ config GENERIC_GPIO
 	help
 	  Generic GPIO API support
 
-config ARCH_NO_VIRT_TO_BUS
-	def_bool y
-
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	def_bool y if SPARC64
 
-- 
1.7.10.280.gaa39

-- 
Cheers,
Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx

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