linux-kernel - Re: [PATCH] remove untouched code in kfifo

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Date:	Tue, 23 Oct 2012 12:39:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	Richard Yang <weiyang@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stefani Seibold <stefani@...bold.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove untouched code in kfifo_in

On Tue, 23 Oct 2012 21:25:46 +0200
richard -rw- weinberger <richard.weinberger@...il.com> wrote:

> > Subject: [PATCH] Replace the type check code with typecheck() in kfifo_in
> >
> > In kfifo_in marco, one piece of code which is arounded by if(0) will check the
> > type of __tmp->ptr_const and __buf. If they are different type, there will
> > output a warning during compiling. This piece of code is not self explaining
> > and a little bit hard to understand.
> >
> > Based on Andrew Morton's suggestion, this patch replace this with typecheck()
> > which will be easy to understand.
> > ---
> >  include/linux/kfifo.h |    5 +----
> >  1 files changed, 1 insertions(+), 4 deletions(-)
> >
> > diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
> > index 10308c6..b48fe71 100644
> > --- a/include/linux/kfifo.h
> > +++ b/include/linux/kfifo.h
> > @@ -512,10 +512,7 @@ __kfifo_uint_must_check_helper( \
> >         unsigned long __n = (n); \
> >         const size_t __recsize = sizeof(*__tmp->rectype); \
> >         struct __kfifo *__kfifo = &__tmp->kfifo; \
> > -       if (0) { \
> > -               typeof(__tmp->ptr_const) __dummy __attribute__ ((unused)); \
> > -               __dummy = (typeof(__buf))NULL; \
> > -       } \
> > +       typecheck(typeof(__tmp->ptr_const), __buf);\
> >         (__recsize) ?\
> >         __kfifo_in_r(__kfifo, __buf, __n, __recsize) : \
> >         __kfifo_in(__kfifo, __buf, __n); \
> 
> What about all the other open coded type checks in that file?

Yes, there are a lot.  Searching for "if (0)" finds them.
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