linux-kernel - Re: [PATCH v2 03/34] compiler-capability-analysis: Add test stub

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Message-ID: <41a14b09-9f09-4abe-8caa-89cfe2687562@acm.org>
Date: Tue, 4 Mar 2025 15:52:07 -0800
From: Bart Van Assche <bvanassche@....org>
To: Marco Elver <elver@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
 Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Alexander Potapenko <glider@...gle.com>, Arnd Bergmann <arnd@...db.de>,
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 Frederic Weisbecker <frederic@...nel.org>,
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Subject: Re: [PATCH v2 03/34] compiler-capability-analysis: Add test stub

On 3/4/25 1:21 AM, Marco Elver wrote:
> +#include <linux/build_bug.h>
> +
> +/*
> + * Test that helper macros work as expected.
> + */
> +static void __used test_common_helpers(void)
> +{
> +	BUILD_BUG_ON(capability_unsafe(3) != 3); /* plain expression */
> +	BUILD_BUG_ON(capability_unsafe((void)2; 3;) != 3); /* does not swallow semi-colon */
> +	BUILD_BUG_ON(capability_unsafe((void)2, 3) != 3); /* does not swallow commas */
> +	capability_unsafe(do { } while (0)); /* works with void statements */
> +}

Is it guaranteed that <linux/build_bug.h> includes the header file that
defines capability_unsafe() or should that header file perhaps be
included explicitly?

Thanks,

Bart.