From: Pekka Enberg <[email protected]>
Introduce krealloc() for reallocating memory while preserving contents.
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
---
include/linux/slab.h | 1 +
mm/util.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
Index: 2.6/include/linux/slab.h
===================================================================
--- 2.6.orig/include/linux/slab.h 2007-02-21 09:05:08.000000000 +0200
+++ 2.6/include/linux/slab.h 2007-02-21 09:05:47.000000000 +0200
@@ -72,6 +72,7 @@
*/
void *__kmalloc(size_t, gfp_t);
void *__kzalloc(size_t, gfp_t);
+void *krealloc(const void *, size_t, gfp_t);
void kfree(const void *);
unsigned int ksize(const void *);
Index: 2.6/mm/util.c
===================================================================
--- 2.6.orig/mm/util.c 2007-02-21 09:05:49.000000000 +0200
+++ 2.6/mm/util.c 2007-02-21 09:34:32.000000000 +0200
@@ -18,6 +18,40 @@
}
EXPORT_SYMBOL(__kzalloc);
+/**
+ * krealloc - reallocate memory. The contents will remain unchanged.
+ *
+ * @p: object to reallocate memory for.
+ * @new_size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate.
+ *
+ * The contents of the object pointed to are preserved up to the
+ * lesser of the new and old sizes. If @p is %NULL, krealloc()
+ * behaves exactly like kmalloc(). If @size is 0 and @p is not a
+ * %NULL pointer, the object pointed to is freed.
+ */
+void *krealloc(const void *p, size_t new_size, gfp_t flags)
+{
+ void *ret;
+
+ if (unlikely(!p))
+ return kmalloc_track_caller(new_size, flags);
+
+ if (unlikely(!new_size)) {
+ kfree(p);
+ return NULL;
+ }
+
+ ret = kmalloc_track_caller(new_size, flags);
+ if (!ret)
+ return NULL;
+
+ memcpy(ret, p, min(new_size, ksize(p)));
+ kfree(p);
+ return ret;
+}
+EXPORT_SYMBOL(krealloc);
+
/*
* kstrdup - allocate space for and copy an existing string
*
-
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