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SubjectRe: [PATCH] use kzalloc instead of malloc+memset
Dmitry Torokhov <> wrote:
> > FWIW I also prefer spelling out the structure I am allocating.

On Mon, 12 Sep 2005, Andrew Morton wrote:
> It hurts readability. Quick question: is this code correct?
> dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
> you don't know. You have to go hunting down the declaration of `dev' to
> find out.

Andrew, how about something like this?


[PATCH] CodingStyle: memory allocation

This patch adds a new chapter on memory allocation to Documentation/CodingStyle.

Signed-off-by: Pekka Enberg <>
CodingStyle | 21 ++++++++++++++++++++-
1 files changed, 20 insertions(+), 1 deletion(-)
Index: 2.6-mm/Documentation/CodingStyle
--- 2.6-mm.orig/Documentation/CodingStyle
+++ 2.6-mm/Documentation/CodingStyle
@@ -410,7 +410,26 @@ Kernel messages do not have to be termin
Printing numbers in parentheses (%d) adds no value and should be avoided.

- Chapter 13: References
+ Chapter 13: Allocating memory
+The kernel provides the following general purpose memory allocators:
+kmalloc(), kzalloc(), kcalloc(), and vmalloc(). Please refer to the API
+documentation for further information about them.
+The preferred form for passing a size of a struct is the following:
+ p = kmalloc(sizeof(*p), ...);
+The alternative form where struct name is spelled out hurts readability and
+introduces an opportunity for a bug when the pointer variable type is changed
+but the corresponding sizeof that is passed to a memory allocator is not.
+Casting the return value which is a void pointer is redundant. The conversion
+from void pointer to any other pointer type is guaranteed by the C programming
+ Chapter 14: References

The C Programming Language, Second Edition
by Brian W. Kernighan and Dennis M. Ritchie.
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