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devres: introduce API "devm_kmemdup 

Introduce devm_kmemdup, which uses resource managed kmalloc.
There are several request from maintainers to add this instead
of using kmemdup.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Srinivas Pandruvada 2014-04-29 00:51:00 +01:00 committed by Jonathan Cameron
parent 37aa48368f
commit 3046365bb4
3 changed files with 24 additions and 0 deletions
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1
Documentation/driver-model/devres.txt
View File

@ -236,6 +236,7 @@ certainly invest a bit more effort into libata core layer).
MEM
devm_kzalloc()
devm_kfree()
devm_kmemdup()
IIO
devm_iio_device_alloc()

21
drivers/base/devres.c
View File

@ -831,3 +831,24 @@ void devm_kfree(struct device *dev, void *p)
WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_kfree);
/**
* devm_kmemdup - Resource-managed kmemdup
* @dev: Device this memory belongs to
* @src: Memory region to duplicate
* @len: Memory region length
* @gfp: GFP mask to use
*
* Duplicate region of a memory using resource managed kmalloc
*/
void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
{
void *p;
p = devm_kmalloc(dev, len, gfp);
if (p)
memcpy(p, src, len);
return p;
}
EXPORT_SYMBOL_GPL(devm_kmemdup);

2
include/linux/device.h
View File

@ -623,6 +623,8 @@ static inline void *devm_kcalloc(struct device *dev,
}
extern void devm_kfree(struct device *dev, void *p);
extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
gfp_t gfp);
void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
void __iomem *devm_request_and_ioremap(struct device *dev,