ARM: enable ARM_PATCH_PHYS_VIRT by default

Enable virtual to physical translation patching by default in all
kernels.  Hide the option behind EMBEDDED.

This can still be turned off if people desire, and they know what
they're doing, to shrink the size of the kernel to a minimum.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5ebc5d9..8882a53 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -195,7 +195,8 @@ config VECTORS_BASE
          The base address of exception vectors.
 
 config ARM_PATCH_PHYS_VIRT
-       bool "Patch physical to virtual translations at runtime"
+       bool "Patch physical to virtual translations at runtime" if EMBEDDED
+       default y
        depends on !XIP_KERNEL && MMU
        depends on !ARCH_REALVIEW || !SPARSEMEM
        help
@@ -207,6 +208,10 @@ config ARM_PATCH_PHYS_VIRT
          of physical memory is at a 16MB boundary, or theoretically 64K
          for the MSM machine class.
 
+         Only disable this option if you know that you do not require
+         this feature (eg, building a kernel for a single machine) and
+         you need to shrink the kernel to the minimal size.
+
 config ARM_PATCH_PHYS_VIRT_16BIT
        def_bool y
        depends on ARM_PATCH_PHYS_VIRT && ARCH_MSM
@@ -301,7 +306,6 @@ config ARCH_AT91
        select ARCH_REQUIRE_GPIOLIB
        select HAVE_CLK
        select CLKDEV_LOOKUP
-       select ARM_PATCH_PHYS_VIRT if MMU
        help
          This enables support for systems based on the Atmel AT91RM9200,
          AT91SAM9 and AT91CAP9 processors.