netdev - RE: [PATCH] wifi：mac80211: Replace the ternary conditional operator with max()

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Date: Thu, 29 Jun 2023 13:28:00 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Ping-Ke Shih' <pkshih@...ltek.com>, You Kangren <youkangren@...o.com>,
	Johannes Berg <johannes@...solutions.net>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, "open list:MAC80211"
	<linux-wireless@...r.kernel.org>, "open list:NETWORKING [GENERAL]"
	<netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
CC: "opensource.kernel@...o.com" <opensource.kernel@...o.com>
Subject: RE: [PATCH] wifi：mac80211: Replace the ternary conditional operator with max()

From: Ping-Ke Shih
> Sent: 28 June 2023 02:49
> 
> > -----Original Message-----
> > From: You Kangren <youkangren@...o.com>
> > Sent: Monday, June 26, 2023 6:48 PM
> > To: Johannes Berg <johannes@...solutions.net>; David S. Miller <davem@...emloft.net>; Eric Dumazet
> > <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; open
> > list:MAC80211 <linux-wireless@...r.kernel.org>; open list:NETWORKING [GENERAL]
> <netdev@...r.kernel.org>;
> > open list <linux-kernel@...r.kernel.org>
> > Cc: opensource.kernel@...o.com; youkangren@...o.com
> > Subject: [PATCH] wifi：mac80211: Replace the ternary conditional operator with max()
> 
> The semicolon of "wifi：" is different from others.
> 
> >
> > Replace the ternary conditional operator with max() to make the code clean
> >
> > Signed-off-by: You Kangren <youkangren@...o.com>
> > ---
> >  net/mac80211/tdls.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
> > index a4af3b7675ef..9f8b0842a616 100644
> > --- a/net/mac80211/tdls.c
> > +++ b/net/mac80211/tdls.c
> > @@ -946,7 +946,7 @@ ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
> >         int ret;
> >         struct ieee80211_link_data *link;
> >
> > -       link_id = link_id >= 0 ? link_id : 0;
> > +       link_id = max(link_id, 0);
> 
> Original logic means "if link_id < 0, then use default link (0)" instead of
> "always use link_id larger than or equal to 0". So, I think max(link_id, 0) could
> cause misunderstanding.

The clearest is probably:
	if (link_id < 0)
		link_id = 0;

The compiler could easily generate the same code (compare and conditional
move).

	David

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