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dma-mapping: remove dma_release_declared_memory 

This function is entirely unused given that declared memory is
generally provided by platform setup code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2019-08-30 08:46:57 +02:00
parent 212836a992
commit 1fa0682448
3 changed files with 0 additions and 28 deletions
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11
Documentation/DMA-API.txt
View File

@ -603,17 +603,6 @@ For reasons of efficiency, most platforms choose to track the declared
region only at the granularity of a page. For smaller allocations,
you should use the dma_pool() API.
::
void
dma_release_declared_memory(struct device *dev)
Remove the memory region previously declared from the system. This
API performs *no* in-use checking for this region and will return
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.
Part III - Debug drivers use of the DMA-API
-------------------------------------------

6
include/linux/dma-mapping.h
View File

@ -764,7 +764,6 @@ static inline int dma_get_cache_alignment(void)
#ifdef CONFIG_DMA_DECLARE_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size);
void dma_release_declared_memory(struct device *dev);
#else
static inline int
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
@ -772,11 +771,6 @@ dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
{
return -ENOSYS;
}
static inline void
dma_release_declared_memory(struct device *dev)
{
}
#endif /* CONFIG_DMA_DECLARE_COHERENT */
static inline void *dmam_alloc_coherent(struct device *dev, size_t size,

11
kernel/dma/coherent.c
View File

@ -124,17 +124,6 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
}
EXPORT_SYMBOL(dma_declare_coherent_memory);
void dma_release_declared_memory(struct device *dev)
{
struct dma_coherent_mem *mem = dev->dma_mem;
if (!mem)
return;
dma_release_coherent_memory(mem);
dev->dma_mem = NULL;
}
EXPORT_SYMBOL(dma_release_declared_memory);
static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
ssize_t size, dma_addr_t *dma_handle)
{