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

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Date:	Thu, 18 Oct 2012 07:34:06 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	Richard Yang <weiyang@...ux.vnet.ibm.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove untouched code in kfifo_in

Am Donnerstag, den 18.10.2012, 09:59 +0800 schrieb Richard Yang:
> On Wed, Oct 17, 2012 at 09:51:49PM +0200, Stefani Seibold wrote:
> >This was introduce by me to suppress a compiler warning, so don't remove
> >it. 
> Which warning? I compile by removing this, but not find warning.
> I compile it on x86_64 platform.
> >

Sorry, i can't remember, it is three years and two gcc major releases
ago.

> >Am Mittwoch, den 17.10.2012, 16:05 +0200 schrieb Jiri Kosina:
> >> 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
> >> 
> >
> 


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