linux-kernel - [PATCH 2/2] x86/xen: mark xen_pv_play_dead() as _

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Message-Id: <20221125063248.30256-3-jgross@suse.com>
Date:   Fri, 25 Nov 2022 07:32:48 +0100
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        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>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        xen-devel@...ts.xenproject.org
Subject: [PATCH 2/2] x86/xen: mark xen_pv_play_dead() as __noreturn

Mark xen_pv_play_dead() and related to that xen_cpu_bringup_again()
as "__noreturn".

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/xen/smp.h    | 2 +-
 arch/x86/xen/smp_pv.c | 4 ++--
 tools/objtool/check.c | 1 +
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index 6e90a312067b..22fb982ff971 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -21,7 +21,7 @@ void xen_smp_send_reschedule(int cpu);
 void xen_smp_send_call_function_ipi(const struct cpumask *mask);
 void xen_smp_send_call_function_single_ipi(int cpu);
 
-void xen_cpu_bringup_again(unsigned long stack);
+void __noreturn xen_cpu_bringup_again(unsigned long stack);
 
 struct xen_common_irq {
 	int irq;
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index b40b24382fe3..5801f93d567c 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -381,7 +381,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
 	}
 }
 
-static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
+static void __noreturn xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
 {
 	play_dead_common();
 	HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
@@ -400,7 +400,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
 	BUG();
 }
 
-static void xen_pv_play_dead(void)
+static void __noreturn xen_pv_play_dead(void)
 {
 	BUG();
 }
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 43ec14c29a60..becdedc2de99 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -189,6 +189,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"snp_abort",
 		"stop_this_cpu",
 		"usercopy_abort",
+		"xen_cpu_bringup_again",
 		"xen_start_kernel",
 	};
 
-- 
2.35.3