linux-kernel - Re: [PATCH] type safe allocator

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Date:	Thu, 02 Aug 2007 15:06:54 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jengelh@...putergmbh.de
CC:	adobriyan@...il.com, miklos@...redi.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH] type safe allocator

> On Aug 2 2007 16:04, Alexey Dobriyan wrote:
> >On 8/2/07, Miklos Szeredi <miklos@...redi.hu> wrote:
> >>   fooptr = kmalloc(sizeof(struct foo), ...);
> >
> >Key word is "traditional". Good traditional form which even half-competent
> >C programmers immediately parse in retina.
> 
> And being aware of the potential type-unsafety makes programmers more
> careful IMHO.

That's a _really_ good reason ;)

> >> +/**
> >> + * alloc_struct - allocate given type object
> >> + * @type: the type of the object to allocate
> >> + * @flags: the type of memory to allocate.
> >> + */
> >> +#define alloc_struct(type, flags) ((type *) kmalloc(sizeof(type), flags))
> 
> >someone will write alloc_struct(int, GFP_KERNEL), I promise.
> 
> and someone else will write
> 
> 	struct complexthing foo;
> 	alloc_struct(foo, GFP_KERNEL);

And the compiler will complain like mad about that.

Miklos
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