linux-kernel - [PATCH v2 06/26] lib/dma-noop: Only build dma_noop

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Date:   Thu, 12 Jan 2017 11:06:58 -0800
From:   Bart Van Assche <bart.vanassche@...disk.com>
To:     Doug Ledford <dledford@...hat.com>
CC:     <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Joerg Roedel <jroedel@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH v2 06/26] lib/dma-noop: Only build dma_noop_ops for m32r and s390

This was suggested by Christoph Hellwig.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Christoph Hellwig <hch@....de>
---
 arch/m32r/Kconfig | 1 +
 arch/s390/Kconfig | 1 +
 lib/Kconfig       | 5 +++++
 lib/Makefile      | 2 +-
 4 files changed, 8 insertions(+), 1 deletion(-)

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
-- 
2.11.0