[PATCH v4 11/15] scatterlist: Add dedicated config for DMA flags

[Catalin Marinas]

From: Robin Murphy <robin.murphy at arm.com>

The DMA flags field will be useful for users beyond PCI P2P, so upgrade
to its own dedicated config option.

Signed-off-by: Robin Murphy <robin.murphy at arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Cc: Christoph Hellwig <hch at lst.de>
---
 drivers/pci/Kconfig         | 1 +
 include/linux/scatterlist.h | 4 ++--
 kernel/dma/Kconfig          | 3 +++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 9309f2469b41..3c07d8d214b3 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -168,6 +168,7 @@ config PCI_P2PDMA
 	#
 	depends on 64BIT
 	select GENERIC_ALLOCATOR
+	select NEED_SG_DMA_FLAGS
 	help
 	  Enableѕ drivers to do PCI peer-to-peer transactions to and from
 	  BARs that are exposed in other devices that are the part of
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 375a5e90d86a..87aaf8b5cdb4 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -16,7 +16,7 @@ struct scatterlist {
 #ifdef CONFIG_NEED_SG_DMA_LENGTH
 	unsigned int	dma_length;
 #endif
-#ifdef CONFIG_PCI_P2PDMA
+#ifdef CONFIG_NEED_SG_DMA_FLAGS
 	unsigned int    dma_flags;
 #endif
 };
@@ -249,7 +249,7 @@ static inline void sg_unmark_end(struct scatterlist *sg)
 }
 
 /*
- * CONFGI_PCI_P2PDMA depends on CONFIG_64BIT which means there is 4 bytes
+ * CONFIG_PCI_P2PDMA depends on CONFIG_64BIT which means there is 4 bytes
  * in struct scatterlist (assuming also CONFIG_NEED_SG_DMA_LENGTH is set).
  * Use this padding for DMA flags bits to indicate when a specific
  * dma address is a bus address.
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index cc750062c412..3e2aab296986 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -24,6 +24,9 @@ config DMA_OPS_BYPASS
 config ARCH_HAS_DMA_MAP_DIRECT
 	bool
 
+config NEED_SG_DMA_FLAGS
+	bool
+
 config NEED_SG_DMA_LENGTH
 	bool