Virtio-msg November 2025

virtio-msg@lists.linaro.org

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[PATCH] dma-buf: add no-op stubs when CONFIG_DMA_SHARED_BUFFER is disabled

by Viresh Kumar

Move several dma-buf function declarations under CONFIG_DMA_SHARED_BUFFER and provide static inline no-op implementations for the disabled case to allow the callers to build when the feature is not compiled in. Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- include/linux/dma-buf.h | 116 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index d58e329ac0e7..06e494d8f6b0 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -568,6 +568,7 @@ static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf) return !!dmabuf->ops->pin; } +#ifdef CONFIG_DMA_SHARED_BUFFER struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct device *dev); struct dma_buf_attachment * @@ -609,4 +610,119 @@ int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); struct dma_buf *dma_buf_iter_begin(void); struct dma_buf *dma_buf_iter_next(struct dma_buf *dmbuf); + +#else +static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, + struct device *dev) +{ + return NULL; +} + +static inline struct dma_buf_attachment * +dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev, + const struct dma_buf_attach_ops *importer_ops, + void *importer_priv) +{ + return NULL; +} + +static inline void dma_buf_detach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attach) { } + +static inline int dma_buf_pin(struct dma_buf_attachment *attach) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_unpin(struct dma_buf_attachment *attach) { } + +static inline struct dma_buf * +dma_buf_export(const struct dma_buf_export_info *exp_info) +{ + return NULL; +} + + +static inline int dma_buf_fd(struct dma_buf *dmabuf, int flags) +{ + return -EOPNOTSUPP; +} + + +static inline struct dma_buf *dma_buf_get(int fd) +{ + return NULL; +} + +static inline void dma_buf_put(struct dma_buf *dmabuf) { } + +static inline struct sg_table * +dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction) +{ + return NULL; +} + +static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *, + struct sg_table *, + enum dma_data_direction) { } + +static inline void dma_buf_move_notify(struct dma_buf *dma_buf) { } + +static inline int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, + enum dma_data_direction dir) +{ + return -EOPNOTSUPP; +} + +static inline int dma_buf_end_cpu_access(struct dma_buf *dma_buf, + enum dma_data_direction dir) +{ + return -EOPNOTSUPP; +} + +static inline struct sg_table * +dma_buf_map_attachment_unlocked(struct dma_buf_attachment *attach, + enum dma_data_direction direction) +{ + return NULL; +} + +static inline void +dma_buf_unmap_attachment_unlocked(struct dma_buf_attachment *attach, + struct sg_table *sg_table, + enum dma_data_direction direction) { } + +static inline int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, + unsigned long) +{ + return -EOPNOTSUPP; +} + +static inline int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map) +{ } + +static inline int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, + struct iosys_map *map) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, + struct iosys_map *map) { } + +static inline struct dma_buf *dma_buf_iter_begin(void) +{ + return NULL; +} + +static inline struct dma_buf *dma_buf_iter_next(struct dma_buf *dmbuf) +{ + return NULL; +} +#endif /* CONFIG_DMA_SHARED_BUFFER */ #endif /* __DMA_BUF_H__ */ -- 2.31.1.272.g89b43f80a514

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