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Subject[PATCH 08/12] dma-mapping: remove dma_mark_declared_memory_occupied
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This API is not used anywhere, so remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
Documentation/DMA-API.txt | 17 -----------------
include/linux/dma-mapping.h | 9 ---------
kernel/dma/coherent.c | 23 -----------------------
3 files changed, 49 deletions(-)

diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index 78114ee63057..b9d0cba83877 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -605,23 +605,6 @@ unconditionally having removed all the required structures. It is the
driver's job to ensure that no parts of this memory region are
currently in use.

-::
-
- void *
- dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size)
-
-This is used to occupy specific regions of the declared space
-(dma_alloc_coherent() will hand out the first free region it finds).
-
-device_addr is the *device* address of the region requested.
-
-size is the size (and should be a page-sized multiple).
-
-The return value will be either a pointer to the processor virtual
-address of the memory, or an error (via PTR_ERR()) if any part of the
-region is occupied.
-
Part III - Debug drivers use of the DMA-API
-------------------------------------------

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index fde0cfc71824..9df0f4d318c5 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -735,8 +735,6 @@ static inline int dma_get_cache_alignment(void)
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size, int flags);
void dma_release_declared_memory(struct device *dev);
-void *dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size);
#else
static inline int
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
@@ -749,13 +747,6 @@ static inline void
dma_release_declared_memory(struct device *dev)
{
}
-
-static inline void *
-dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size)
-{
- return ERR_PTR(-EBUSY);
-}
#endif /* CONFIG_DMA_DECLARE_COHERENT */

static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 4b76aba574c2..1d12a31af6d7 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -137,29 +137,6 @@ void dma_release_declared_memory(struct device *dev)
}
EXPORT_SYMBOL(dma_release_declared_memory);

-void *dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size)
-{
- struct dma_coherent_mem *mem = dev->dma_mem;
- unsigned long flags;
- int pos, err;
-
- size += device_addr & ~PAGE_MASK;
-
- if (!mem)
- return ERR_PTR(-EINVAL);
-
- spin_lock_irqsave(&mem->spinlock, flags);
- pos = PFN_DOWN(device_addr - dma_get_device_base(dev, mem));
- err = bitmap_allocate_region(mem->bitmap, pos, get_order(size));
- spin_unlock_irqrestore(&mem->spinlock, flags);
-
- if (err != 0)
- return ERR_PTR(err);
- return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
-
static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
ssize_t size, dma_addr_t *dma_handle)
{
--
2.20.1
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