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

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Message-ID: <alpine.LNX.2.00.1210171605030.17129@pobox.suse.cz>
Date:	Wed, 17 Oct 2012 16:05:13 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Richard Yang <weiyang@...ux.vnet.ibm.com>
Cc:	Stefani Seibold <stefani@...bold.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove untouched code in kfifo_in

On Wed, 17 Oct 2012, Richard Yang wrote:

> >> This patch just remove this code.
> >> ---
> >>  include/linux/kfifo.h |    4 ----
> >>  1 files changed, 0 insertions(+), 4 deletions(-)
> >> 
> >> diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
> >> index 10308c6..e7015bb 100644
> >> --- a/include/linux/kfifo.h
> >> +++ b/include/linux/kfifo.h
> >> @@ -512,10 +512,6 @@ __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; \
> >> -	} \
> >>  	(__recsize) ?\
> >>  	__kfifo_in_r(__kfifo, __buf, __n, __recsize) : \
> >>  	__kfifo_in(__kfifo, __buf, __n); \
> >
> >Frankly, I'd first like to understand what was the rationale for adding it 
> >at the first place. Adding Stefani and lkml to CC.
> 
> Agree.
> 
> BTW, by git blame, I just see commit 2e956fb3 which is checked in by Stefani. 
> While looking in the diff, the kfifo_in() is already there. Looks like this
> commit move the definition from one file to another file. 
> 
> So I am not sure the if(0) code is added by Stefani. Any other method to trace
> the ealier history?

git blame -- include/linux/kfifo-new.h 2e956fb3~1

-- 
Jiri Kosina
SUSE Labs
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