linux-kernel - RE: [RFC][PATCH] rcu: Use typeof(p) instead of typeof(*p) *

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Date:   Mon, 11 Oct 2021 08:34:06 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Steven Rostedt' <rostedt@...dmis.org>,
        Jan Engelhardt <jengelh@...i.de>
CC:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Paul <paulmck@...ux.vnet.ibm.com>,
        Josh Triplett <josh@...htriplett.org>,
        "Lai Jiangshan" <jiangshanlai@...il.com>,
        "Joel Fernandes, Google" <joel@...lfernandes.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        "Jozsef Kadlecsik" <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, rcu <rcu@...r.kernel.org>,
        netfilter-devel <netfilter-devel@...r.kernel.org>,
        coreteam <coreteam@...filter.org>,
        netdev <netdev@...r.kernel.org>
Subject: RE: [RFC][PATCH] rcu: Use typeof(p) instead of typeof(*p) *

From: Steven Rostedt
> Sent: 05 October 2021 22:25
> 
...
> 
> Basically (one alternative I was looking at) was simply passing around a
> void pointer. Not sure how the RCU macros would handle that. But to
> completely abstract it out, I was thinking of just returning void * and
> accepting void *, but I didn't want to do that because now we just lost any
> kind of type checking done by the compiler. The tricks I was playing was to
> keep some kind of type checking.

Yes, don't use 'void *'.
Sun used it for all the pointers in their DDI/DKI - made it impossible
to ensure you were passing in the right type of 'token'.

	David

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