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Date: Mon, 2 Feb 2026 10:58:21 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Arnd Bergmann <arnd@kernel.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
	Joel Fernandes <joelagnelf@nvidia.com>,
	Josh Triplett <josh@joshtriplett.org>,
	Boqun Feng <boqun@kernel.org>, Uladzislau Rezki <urezki@gmail.com>,
	Marco Elver <elver@google.com>, Arnd Bergmann <arnd@arndb.de>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Zqiang <qiang.zhang@linux.dev>, Vlastimil Babka <vbabka@suse.cz>,
	Harry Yoo <harry.yoo@oracle.com>,
	Menglong Dong <menglong8.dong@gmail.com>,
	Herbert Xu <herbert@gondor.apana.org.au>, rcu@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rcu: mark lockdep_assert_rcu_helper() __always_inline
Message-ID: <20260202095821.GF2995752@noisy.programming.kicks-ass.net>
References: <20260202095507.1237440-1-arnd@kernel.org>
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In-Reply-To: <20260202095507.1237440-1-arnd@kernel.org>

On Mon, Feb 02, 2026 at 10:55:01AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> There are some configurations in which lockdep_assert_rcu_helper() ends up
> not being inlined, for some reason. This leads to a link failure because
> now the caller tries to pass a nonexistant __ctx_lock_RCU structure:
> 
> ld: lib/test_context-analysis.o: in function `test_rcu_assert_variants':
> test_context-analysis.c:(.text+0x275c): undefined reference to `RCU'
> ld: test_context-analysis.c:(.text+0x276c): undefined reference to `RCU_BH'
> ld: test_context-analysis.c:(.text+0x2774): undefined reference to `RCU_SCHED'
> 
> I saw this in one out of many 32-bit arm builds using gcc-15.2, but
> it probably happens in others as well.
> 
> Mark this function as __always_inline to fix the build.
> 
> Fixes: fe00f6e84621 ("rcu: Support Clang's context analysis")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks!