linux-kernel - Re: [RFC PATCH 1/7] static_call: get rid of static_call

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Date:   Tue, 9 Nov 2021 20:32:32 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mark Rutland <mark.rutland@....com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC PATCH 1/7] static_call: get rid of static_call_cond()

On Tue, Nov 09, 2021 at 05:45:43PM +0100, Ard Biesheuvel wrote:
>  static inline
>  void __static_call_update(struct static_call_key *key, void *tramp, void *func)
>  {
> +	WRITE_ONCE(key->func, func ?: (void *)&__static_call_nop);
>  }

Ha, yes, I suppose that ought to work.