[ARM] Ensure that both MAX_DMA_ADDRESS and ISA_DMA_THRESHOLD are defined

Both of these symbols should be defined by a platform, or neither
should be defined.  Ensure that all platforms conform.

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

1 files changed, 1 insertions, 3 deletions

diff --git a/arch/arm/mach-h720x/include/mach/memory.h b/arch/arm/mach-h720x/include/mach/memory.h
index c9bdb21a4445..ef4c1e26f18e 100644
--- a/arch/arm/mach-h720x/include/mach/memory.h
+++ b/arch/arm/mach-h720x/include/mach/memory.h
@@ -12,10 +12,8 @@
  * This is the maximum DMA address that can be DMAd to.
  * There should not be more than (0xd0000000 - 0xc0000000)
  * bytes of RAM.
- *
- * If you set this, you must also set ISA_DMA_THRESHOLD and setup a DMA
- * zone if this does not cover all possible RAM.
  */
+#define ISA_DMA_THRESHOLD       (PHYS_OFFSET + SZ_256M - 1)
 #define MAX_DMA_ADDRESS         (PAGE_OFFSET + SZ_256M)
 
 #endif