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dma-mapping: remove dma_zalloc_coherent()

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dma_zalloc_coherent() is no longer needed as it has no users because
dma_alloc_coherent() already zeroes out memory for us.

The Coccinelle grammar rule that used to check for dma_alloc_coherent()
+ memset() is modified so that it just tells the user that the memset is
not needed anymore.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Luis Chamberlain 2018-12-19 12:30:34 -08:00 committed by Christoph Hellwig
parent 07a85fe142
commit dfd32cad14
3 changed files with 5 additions and 23 deletions
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9
include/linux/dma-mapping.h
View File

@ -717,15 +717,6 @@ static inline unsigned long dma_max_pfn(struct device *dev)
}
#endif
/*
* Please always use dma_alloc_coherent instead as it already zeroes the memory!
*/
static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
return dma_alloc_coherent(dev, size, dma_handle, flag);
}
static inline int dma_get_cache_alignment(void)
{
#ifdef ARCH_DMA_MINALIGN

8
scripts/coccinelle/api/alloc/alloc_cast.cocci
View File

@ -32,7 +32,7 @@ type T;
(T *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
@ -55,7 +55,7 @@ type r1.T;
* (T *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
@ -78,7 +78,7 @@ type r1.T;
- (T *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
@ -95,7 +95,7 @@ position p;
(T@p *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)

11
scripts/coccinelle/api/alloc/zalloc-simple.cocci
View File

@ -69,15 +69,6 @@ statement S;
- x = (T)vmalloc(E1);
+ x = (T)vzalloc(E1);
|
- x = dma_alloc_coherent(E2,E1,E3,E4);
+ x = dma_zalloc_coherent(E2,E1,E3,E4);
|
- x = (T *)dma_alloc_coherent(E2,E1,E3,E4);
+ x = dma_zalloc_coherent(E2,E1,E3,E4);
|
- x = (T)dma_alloc_coherent(E2,E1,E3,E4);
+ x = (T)dma_zalloc_coherent(E2,E1,E3,E4);
|
- x = kmalloc_node(E1,E2,E3);
+ x = kzalloc_node(E1,E2,E3);
|
@ -225,7 +216,7 @@ p << r2.p;
x << r2.x;
@@
msg="WARNING: dma_zalloc_coherent should be used for %s, instead of dma_alloc_coherent/memset" % (x)
msg="WARNING: dma_alloc_coherent use in %s already zeroes out memory, so memset is not needed" % (x)
coccilib.report.print_report(p[0], msg)
//-----------------------------------------------------------------