linux-kernel - [PATCH v4 14/30] perf/x86/amd: Mark perf_lopwr_cb static call as __ro_after

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Message-ID: <20250114175143.81438-15-vschneid@redhat.com>
Date: Tue, 14 Jan 2025 18:51:27 +0100
From: Valentin Schneider <vschneid@...hat.com>
To: linux-kernel@...r.kernel.org,
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Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Alexey Makhalov <alexey.amakhalov@...adcom.com>,
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Subject: [PATCH v4 14/30] 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 780acd3dff22a..e2ff03af15d82 100644
--- a/arch/x86/events/amd/brs.c
+++ b/arch/x86/events/amd/brs.c
@@ -422,7 +422,7 @@ 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)
-- 
2.43.0