netdev - RE: [PATCH] tcp: Use BIT() for OPTION

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Message-ID: <0b48f1ae32ba49f38dcfe11f912c4ace@AcuMS.aculab.com>
Date:   Thu, 4 Nov 2021 09:17:07 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Eric Dumazet' <eric.dumazet@...il.com>,
        Leonard Crestez <cdleonard@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>
CC:     Dmitry Safonov <0x7f454c46@...il.com>,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Neal Cardwell <ncardwell@...gle.com>,
        "Yuchung Cheng" <ycheng@...gle.com>,
        Enke Chen <enchen@...oaltonetworks.com>,
        Wei Wang <weiwan@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] tcp: Use BIT() for OPTION_* constants

From: Eric Dumazet
> Sent: 03 November 2021 22:50
> 
> On 11/3/21 3:17 PM, Leonard Crestez wrote:
> > Extending these flags using the existing (1 << x) pattern triggers
> > complaints from checkpatch. Instead of ignoring checkpatch modify the
> > existing values to use BIT(x) style in a separate commit.
> >
> > Signed-off-by: Leonard Crestez <cdleonard@...il.com>
> >
> 
> Yes, I guess checkpatch does not know that we currently use at most 16 bits :)
> 
> u16 options = opts->options;
> 
> Anyway, this seems fine.

Doesn't BIT() have a nasty habit of generating 64bit constants
that just cause a different set of issues when inverted?
It may be safe here - but who knows.

	David

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