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Date:   Thu, 9 Jul 2020 12:30:24 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Brian Gerst <brgerst@gmail.com>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Andy Lutomirski <luto@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH v2 02/10] x86/percpu: Clean up percpu_to_op()
Message-ID: <20200709103024.GO597537@hirez.programming.kicks-ass.net>
References: <20200530221127.459704-1-brgerst@gmail.com>
 <20200530221127.459704-3-brgerst@gmail.com>
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On Sat, May 30, 2020 at 06:11:19PM -0400, Brian Gerst wrote:
> +	if (0) {		                                        \
> +		typeof(_var) pto_tmp__;					\
> +		pto_tmp__ = (_val);					\
> +		(void)pto_tmp__;					\
> +	}								\

This is repeated at least once more; and it looks very similar to
__typecheck() and typecheck() but is yet another variant afaict.