linux-kernel - [PATCH 1/2] dma-mapping: move dma_addressing

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Date:   Wed,  4 Dec 2019 14:03:38 +0100
From:   Christoph Hellwig <hch@....de>
To:     Thomas Hellstrom <thellstrom@...are.com>
Cc:     Christian König <christian.koenig@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        iommu@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dma-mapping: move dma_addressing_limited out of line

This function isn't used in the fast path, and moving it out of line
will reduce include clutter with the next change.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/dma-mapping.h | 14 +-------------
 kernel/dma/mapping.c        | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 330ad58fbf4d..be0421e570b8 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -684,19 +684,7 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 	return dma_set_mask_and_coherent(dev, mask);
 }
 
-/**
- * dma_addressing_limited - return if the device is addressing limited
- * @dev:	device to check
- *
- * Return %true if the devices DMA mask is too small to address all memory in
- * the system, else %false.  Lack of addressing bits is the prime reason for
- * bounce buffering, but might not be the only one.
- */
-static inline bool dma_addressing_limited(struct device *dev)
-{
-	return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
-			    dma_get_required_mask(dev);
-}
+bool dma_addressing_limited(struct device *dev);
 
 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 12ff766ec1fa..1dbe6d725962 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -405,3 +405,18 @@ unsigned long dma_get_merge_boundary(struct device *dev)
 	return ops->get_merge_boundary(dev);
 }
 EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
+
+/**
+ * dma_addressing_limited - return if the device is addressing limited
+ * @dev:	device to check
+ *
+ * Return %true if the devices DMA mask is too small to address all memory in
+ * the system, else %false.  Lack of addressing bits is the prime reason for
+ * bounce buffering, but might not be the only one.
+ */
+bool dma_addressing_limited(struct device *dev)
+{
+	return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
+			    dma_get_required_mask(dev);
+}
+EXPORT_SYMBOL_GPL(dma_addressing_limited);
-- 
2.20.1