linux-kernel - Re: [PATCH v2 02/34] compiler-capability-analysis: Add infrastructure for Clang's capability analysis

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Message-ID: <20250304152909.GH11590@noisy.programming.kicks-ass.net>
Date: Tue, 4 Mar 2025 16:29:09 +0100
From: Peter Zijlstra <peterz@...radead.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>, Bart Van Assche <bvanassche@....org>,
	Bill Wendling <morbo@...gle.com>, Boqun Feng <boqun.feng@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Ingo Molnar <mingo@...nel.org>, Jann Horn <jannh@...gle.com>,
	Jiri Slaby <jirislaby@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Jonathan Corbet <corbet@....net>,
	Josh Triplett <josh@...htriplett.org>,
	Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>,
	Kentaro Takeda <takedakn@...data.co.jp>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Thomas Gleixner <tglx@...utronix.de>,
	Uladzislau Rezki <urezki@...il.com>,
	Waiman Long <longman@...hat.com>, Will Deacon <will@...nel.org>,
	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, rcu@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 02/34] compiler-capability-analysis: Add
 infrastructure for Clang's capability analysis

On Tue, Mar 04, 2025 at 10:21:01AM +0100, Marco Elver wrote:

> +# define __asserts_cap(var)			__attribute__((assert_capability(var)))
> +# define __asserts_shared_cap(var)		__attribute__((assert_shared_capability(var)))

> +	static __always_inline void __assert_cap(const struct name *var)				\
> +		__attribute__((overloadable)) __asserts_cap(var) { }					\
> +	static __always_inline void __assert_shared_cap(const struct name *var)				\
> +		__attribute__((overloadable)) __asserts_shared_cap(var) { }				\

Since this does not in fact check -- that's __must_hold(), I would
suggest renaming these like s/assert/assume/.