linux-kernel - [PATCH v7 14/31] perf/x86/amd: Mark perf_lopwr_cb static call as __ro_after

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Message-ID: <20251114150133.1056710-15-vschneid@redhat.com>
Date: Fri, 14 Nov 2025 16:01:16 +0100
From: Valentin Schneider <vschneid@...hat.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	rcu@...r.kernel.org,
	x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	loongarch@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Frederic Weisbecker <frederic@...nel.org>,
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	Steven Rostedt <rostedt@...dmis.org>,
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	Sami Tolvanen <samitolvanen@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
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	Yair Podemsky <ypodemsk@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Daniel Wagner <dwagner@...e.de>,
	Petr Tesarik <ptesarik@...e.com>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: [PATCH v7 14/31] perf/x86/amd: Mark perf_lopwr_cb static call as __ro_after_init

Later commits will cause objtool to warn about static calls being used in
.noinstr sections in order to safely defer instruction patching IPIs
targeted at NOHZ_FULL CPUs.

perf_lopwr_cb is used in .noinstr code, but is only ever updated in __init
amd_brs_lopwr_init(), and can thus be marked as __ro_after_init.

Reported-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Valentin Schneider <vschneid@...hat.com>
---
 arch/x86/events/amd/brs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/brs.c b/arch/x86/events/amd/brs.c
index 06f35a6b58a5b..71d7ba774a063 100644
--- a/arch/x86/events/amd/brs.c
+++ b/arch/x86/events/amd/brs.c
@@ -423,7 +423,7 @@ void noinstr perf_amd_brs_lopwr_cb(bool lopwr_in)
 	}
 }
 
-DEFINE_STATIC_CALL_NULL(perf_lopwr_cb, perf_amd_brs_lopwr_cb);
+DEFINE_STATIC_CALL_NULL_RO(perf_lopwr_cb, perf_amd_brs_lopwr_cb);
 EXPORT_STATIC_CALL_TRAMP_GPL(perf_lopwr_cb);
 
 void __init amd_brs_lopwr_init(void)
-- 
2.51.0