linux-kernel - Re: [PATCH] CodingStyle: delete "kmalloc(sizeof(*var))" as preferred allocation form

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Date:   Thu, 25 May 2017 12:46:04 +0200
From:   Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:     Joe Perches <joe@...ches.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] CodingStyle: delete "kmalloc(sizeof(*var))" as
 preferred allocation form

On Thu, 2017-05-25 at 03:35 -0700, Joe Perches wrote:
> On Wed, 2017-05-24 at 13:18 +0300, Alexey Dobriyan wrote:
> > Proper fix is to introduce typed allocation macros with the following
> > signatures:
> > 
> > T* lmalloc(T, gfp);

Ack (FWIW).

[...]
> >     struct foo *x;
> >     x = lmalloc(struct foo, GFP_KERNEL);
> 
> Then code would be written
> 
> 	x = lmalloc(typeof(*x), GFP_KERNEL);

At least it is correct and changes automagically if x changes the type
which
	struct bar *x;
	x = kmalloc(sizeof(struct foo), GFP_KERNEL);
doesn't do and the compiler doesn't complain.

And the typeof() version could be written that way today but I can't
remember seeing it (in the kernel and elsewhere).

MfG,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at