Re: [PATCH 1/6] devres: introduce API "devm_kmemdup

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On 29/04/14 00:51, Srinivas Pandruvada wrote:
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@xxxxxxxxxxxxxxx>
Applied to the togreg branch of iio.git.  Initially pushed out as testing
for the autobuilders to play.

Thanks,
---
  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 d1d1c05..ab87158 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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,


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