linux-kernel - [PATCH] dma-mapping: Stub out dma_{alloc,free,map}

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Message-Id: <20250616111749.316413-1-james.clark@linaro.org>
Date: Mon, 16 Jun 2025 12:17:49 +0100
From: James Clark <james.clark@...aro.org>
To: hch@....de
Cc: olteanv@...il.com,
	broonie@...nel.org,
	oe-kbuild-all@...ts.linux.dev,
	arnd@...db.de,
	larisa.grigore@....com,
	Frank.li@....com,
	linux-spi@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	James Clark <james.clark@...aro.org>,
	kernel test robot <lkp@...el.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	iommu@...ts.linux.dev
Subject: [PATCH] dma-mapping: Stub out dma_{alloc,free,map}_pages() API

The implementations are in mapping.c which requires HAS_DMA so stub them
out if not present. This is required for some drivers to pass randconfig
builds.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506160036.t9VDxF6p-lkp@intel.com/
Signed-off-by: James Clark <james.clark@...aro.org>
---
 include/linux/dma-mapping.h | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 55c03e5fe8cb..766f28a0e11f 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -161,6 +161,12 @@ void *dma_vmap_noncontiguous(struct device *dev, size_t size,
 void dma_vunmap_noncontiguous(struct device *dev, void *vaddr);
 int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
 		size_t size, struct sg_table *sgt);
+struct page *dma_alloc_pages(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_free_pages(struct device *dev, size_t size, struct page *page,
+		dma_addr_t dma_handle, enum dma_data_direction dir);
+int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
+		size_t size, struct page *page);
 #else /* CONFIG_HAS_DMA */
 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 		struct page *page, size_t offset, size_t size,
@@ -291,6 +297,21 @@ static inline int dma_mmap_noncontiguous(struct device *dev,
 {
 	return -EINVAL;
 }
+static inline struct page *dma_alloc_pages(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
+{
+	return NULL;
+}
+static inline void dma_free_pages(struct device *dev, size_t size,
+		struct page *page, dma_addr_t dma_handle,
+		enum dma_data_direction dir)
+{
+}
+static inline int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
+				 size_t size, struct page *page)
+{
+	return -EINVAL;
+}
 #endif /* CONFIG_HAS_DMA */
 
 #ifdef CONFIG_IOMMU_DMA
@@ -438,13 +459,6 @@ static inline bool dma_need_unmap(struct device *dev)
 }
 #endif /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */
 
-struct page *dma_alloc_pages(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
-void dma_free_pages(struct device *dev, size_t size, struct page *page,
-		dma_addr_t dma_handle, enum dma_data_direction dir);
-int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
-		size_t size, struct page *page);
-
 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
 {
-- 
2.34.1