[Patch v3 1/6] devres: introduce API "devm_kmemdup

Srinivas Pandruvada
2014-04-09T00:53:12Z

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>
---
Documentation/driver-model/devres.txt | 1 +
drivers/base/devres.c | 21 +++++++++++++++++++++
include/linux/device.h | 2 ++
3 files changed, 24 insertions(+)

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 4f7897e..4999518 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -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()
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index db4e264..d0914cb 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -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);
diff --git a/include/linux/device.h b/include/linux/device.h
index 233bbbe..0b3117a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -629,6 +629,8 @@ 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,
--
1.7.11.7