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From: Joe Perches <joe@perches.com>
To: Greg KH <gregkh@linuxfoundation.org>,
	Michael Straube <straube.linux@gmail.com>
Cc: Larry.Finger@lwfinger.net, phil@philpotter.co.uk,
	martin@kaiser.cx, fmdefrancesco@gmail.com,
	linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: r8188eu: refactor rtw_is_cckrates{only}_included()
Date: Tue, 17 Aug 2021 11:36:09 -0700	[thread overview]
Message-ID: <11a09af791c5453175a6bdac1c51bd9fcb0685bd.camel@perches.com> (raw)
In-Reply-To: <YRv4po3sLcH9VLuo@kroah.com>

On Tue, 2021-08-17 at 19:57 +0200, Greg KH wrote:
> On Mon, Aug 16, 2021 at 09:31:25PM +0200, Michael Straube wrote:
> > Refactor functions rtw_is_cckrates_included() and
> > rtw_is_cckratesonly_included(). Add new helper function rtw_is_cckrate()
> > that allows to make the code more compact. Improves readability and
> > slightly reduces object file size. Change the return type to bool to
> > reflect that the functions return boolean values.
[]
> > diff --git a/drivers/staging/r8188eu/core/rtw_ieee80211.c b/drivers/staging/r8188eu/core/rtw_ieee80211.c
[]
> > +bool rtw_is_cckratesonly_included(u8 *rate)
> >  {
> > -	u32 i = 0;
> > +	u8 r;
> >  
> > 
> > -	while (rate[i] != 0) {
> > -		if  ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
> > -		     (((rate[i]) & 0x7f) != 11)  && (((rate[i]) & 0x7f) != 22))
> > +	while ((r = *rate++)) {
> 
> Ick, no.
> 
> While it might be fun to play with pointers like this, trying to
> determine the precidence issues involved with reading from, and then
> incrementing the pointer like this is crazy.
> 
> The original was obvious as to how it was walking through the array.

It's sad to believe *ptr++ is not obvious to you as it's very commonly
used in the kernel sources (over 10,000 instances).



  reply	other threads:[~2021-08-17 18:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16 19:31 Michael Straube
2021-08-16 20:09 ` Fabio M. De Francesco
2021-08-17 17:57 ` Greg KH
2021-08-17 18:36   ` Joe Perches [this message]
2021-08-17 18:49     ` Greg KH
2021-08-17 18:59       ` Joe Perches
2021-08-18  6:23       ` Fabio M. De Francesco
2021-08-18  6:33         ` Greg KH

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