linux-kernel - RE: [PATCH] net: netcp: MAX_SKB

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Message-ID: <5c940a6c29674b2986e4e9be1c2e4b39@AcuMS.aculab.com>
Date:   Sat, 1 Apr 2023 18:20:54 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Eric Dumazet' <edumazet@...gle.com>,
        Alexander Lobakin <aleksander.lobakin@...el.com>
CC:     Arnd Bergmann <arnd@...nel.org>, Jakub Kicinski <kuba@...nel.org>,
        "Arnd Bergmann" <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        "Paolo Abeni" <pabeni@...hat.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        "Jason Xing" <kerneljasonxing@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] net: netcp: MAX_SKB_FRAGS is now 'int'

From: Eric Dumazet
> Sent: 31 March 2023 17:58
....
> > I'd personally define %MAX_SKB_FRAGS as `(u32)CONFIG_MAX_SKB_FRAGS`.
> > It can't be below zero or above %U32_MAX and we have to define it
> > manually anyway, so why not cast to the type expected from it :D
> >
> 
> Some files have the assumption MAX_SKB_FRAGS can be understood by the
> C preprocessor.
> 
> #if MAX_SKB_FRAGS > 32

...

You could use:
#define MAX_SKB_FRAGS (CONFIG_MAX_SKB_FRAGS + 0u)
to force the type to be 'unsigned int' while still leaving
a value that cpp groks.
(Or add 0ul to get the type back? to 'unsigned long'.)

	David

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