From 7844572c633964c864d9f32dc3f2a8ffe5d70371 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Fri, 20 Jan 2017 13:04:06 -0800
Subject: 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>
---
 lib/Kconfig  | 5 +++++
 lib/Makefile | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

(limited to 'lib')

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
-- 
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