linux-kernel - [RFC 2/5] x86/smpboot: Export wakeup_secondary_cpu_via

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Message-Id: <20250923153146.365015-3-fam.zheng@bytedance.com>
Date: Tue, 23 Sep 2025 15:31:43 +0000
From: Fam Zheng <fam.zheng@...edance.com>
To: linux-kernel@...r.kernel.org
Cc: Lukasz Luba <lukasz.luba@....com>,
	linyongting@...edance.com,
	songmuchun@...edance.com,
	satish.kumar@...edance.com,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	yuanzhu@...edance.com,
	Ingo Molnar <mingo@...hat.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	fam.zheng@...edance.com,
	Zhang Rui <rui.zhang@...el.com>,
	fam@...hon.net,
	"H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org,
	liangma@...edance.com,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	guojinhui.liam@...edance.com,
	linux-pm@...r.kernel.org,
	Thom Hughes <thom.hughes@...edance.com>
Subject: [RFC 2/5] x86/smpboot: Export wakeup_secondary_cpu_via_init

From: Thom Hughes <thom.hughes@...edance.com>

Will be used by parker setup code.

Signed-off-by: Thom Hughes <thom.hughes@...edance.com>
Signed-off-by: Fam Zheng <fam.zheng@...edance.com>
---
 arch/x86/include/asm/smp.h | 1 +
 arch/x86/kernel/smpboot.c  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index ca073f40698f..cfc212bbb4a6 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -104,6 +104,7 @@ void native_smp_prepare_boot_cpu(void);
 void smp_prepare_cpus_common(void);
 void native_smp_prepare_cpus(unsigned int max_cpus);
 void native_smp_cpus_done(unsigned int max_cpus);
+int wakeup_secondary_cpu_via_init(u32 phys_apicid, unsigned long start_eip);
 int common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 int native_kick_ap(unsigned int cpu, struct task_struct *tidle);
 int native_cpu_disable(void);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c10850ae6f09..c9a941178488 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -715,7 +715,7 @@ static void send_init_sequence(u32 phys_apicid)
 /*
  * Wake up AP by INIT, INIT, STARTUP sequence.
  */
-static int wakeup_secondary_cpu_via_init(u32 phys_apicid, unsigned long start_eip)
+int wakeup_secondary_cpu_via_init(u32 phys_apicid, unsigned long start_eip)
 {
 	unsigned long send_status = 0, accept_status = 0;
 	int num_starts, j, maxlvt;
-- 
2.39.5