lib/dma-noop: Only build dma_noop_ops for s390 and m32r

Reduce the kernel size by only building dma_noop_ops for those
architectures that actually use it. This was suggested by
Christoph Hellwig.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>

4 files changed, 8 insertions, 1 deletions

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index d227a6988d6b..95474460b367 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -18,6 +18,7 @@ config M32R
         select MODULES_USE_ELF_RELA
         select HAVE_DEBUG_STACKOVERFLOW
         select CPU_NO_EFFICIENT_FFS
+        select DMA_NOOP_OPS
 
 config SBUS
         bool
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index c6722112527d..38ad42358c41 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -137,6 +137,7 @@ config S390
         select HAVE_DEBUG_KMEMLEAK
         select HAVE_DMA_API_DEBUG
         select HAVE_DMA_CONTIGUOUS
+        select DMA_NOOP_OPS
         select HAVE_DYNAMIC_FTRACE
         select HAVE_DYNAMIC_FTRACE_WITH_REGS
         select HAVE_EFFICIENT_UNALIGNED_ACCESS
diff --git a/lib/Kconfig b/lib/Kconfig
index 260a80e313b9..b6baf0609e8b 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -395,6 +395,11 @@ config HAS_DMA
         depends on !NO_DMA
         default y
 
+config DMA_NOOP_OPS
+        bool
+        depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
+        default n
+
 config CHECK_SIGNATURE
         bool
 
diff --git a/lib/Makefile b/lib/Makefile
index bc4073a8cd08..ada06d5652e8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -26,7 +26,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
-lib-$(CONFIG_HAS_DMA) += dma-noop.o
+lib-$(CONFIG_DMA_NOOP_OPS) += dma-noop.o
 
 lib-y   += kobject.o klist.o
 obj-y   += lockref.o