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Date:   Tue, 5 Oct 2021 20:48:42 +0200
From:   Rasmus Villemoes <>
To:     Mathieu Desnoyers <>
Cc:     rostedt <>,
        linux-kernel <>,
        Linus Torvalds <>,
        Paul <>,
        Josh Triplett <>,
        Lai Jiangshan <>,
        "Joel Fernandes, Google" <>,
        Pablo Neira Ayuso <>,
        Jozsef Kadlecsik <>,
        Florian Westphal <>,
        "David S. Miller" <>,
        Hideaki YOSHIFUJI <>,
        David Ahern <>,
        Jakub Kicinski <>, rcu <>,
        netfilter-devel <>,
        coreteam <>,
        netdev <>
Subject: Re: [RFC][PATCH] rcu: Use typeof(p) instead of typeof(*p) *

On 05/10/2021 20.06, Mathieu Desnoyers wrote:
> ----- On Oct 5, 2021, at 2:01 PM, Rasmus Villemoes wrote:
>> I would think that one could avoid that churn by saying
>>  typeof((p) + 0)
>> instead of just "typeof(p)", to force the decay to a pointer.
> Also, AFAIU, the compiler wants to know the sizeof(p) in order to evaluate
> (p + 0). Steven's goal is to hide the structure declaration, so that would
> not work either.

Gah, you're right. I was hoping the frontend would see that +0 could be
optimized away and only affect the type of the expression, but it does
give 'error: invalid use of undefined type ‘struct abc’'. Sorry for the


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