Hi Miklos,
On Wed, 1 Aug 2007, Miklos Szeredi wrote:
> I wonder why we don't have type safe object allocators a-la new() in
> C++ or g_new() in glib?
>
> fooptr = k_new(struct foo, GFP_KERNEL);
>
> is nicer and more descriptive than
>
> fooptr = kmalloc(sizeof(*fooptr), GFP_KERNEL);
>
> and more safe than
>
> fooptr = kmalloc(sizeof(struct foo), GFP_KERNEL);
>
> And we have zillions of both variants.
>
> Note, I'm not advocating mass replacement, but using this in new code,
> and gradually converting old ones whenever they need touching anyway.
> [...]
>
> +/**
> + * k_new - allocate given type object
> + * @type: the type of the object to allocate
> + * @flags: the type of memory to allocate.
> + */
> +#define k_new(type, flags) ((type *) kmalloc(sizeof(type), flags))
What others already said, plus:
kmalloc()'ing sizeof(struct foo) is not always what we want in C either.
Several kernel structs have zero-length / variable-length array members
and space must be allocated for them only at alloc() time ... would be
impossible to make them work with this scheme.
Satyam
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