linux-kernel - [PATCH] riscv: print hartid on bringup

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Message-Id: <20250201110607.34766-1-cuiyunhui@bytedance.com>
Date: Sat,  1 Feb 2025 19:06:07 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: apatel@...tanamicro.com,
	atishp@...osinc.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	cuiyunhui@...edance.com,
	samuel.holland@...ive.com,
	alexghiti@...osinc.com,
	jassisinghbrar@...il.com,
	takakura@...inux.co.jp,
	valentina.fernandezalanis@...rochip.com,
	ruanjinjie@...wei.com,
	charlie@...osinc.com,
	conor.dooley@...rochip.com,
	haibo1.xu@...el.com,
	andybnac@...il.com,
	ke.zhao@...ngroup.cn,
	tglx@...utronix.de,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: print hartid on bringup

Firmware randomly releases cores, so CPU numbers don't linearly map
to hartids. When the system has an exception, we care more about hartids.

Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
---
 arch/riscv/kernel/smp.c     | 2 ++
 arch/riscv/kernel/smpboot.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index d58b5e751286..e650dec44817 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -48,6 +48,8 @@ EXPORT_SYMBOL_GPL(__cpuid_to_hartid_map);
 void __init smp_setup_processor_id(void)
 {
 	cpuid_to_hartid_map(0) = boot_cpu_hartid;
+
+	pr_info("Booting Linux on hartid %lu\n", boot_cpu_hartid);
 }
 
 static DEFINE_PER_CPU_READ_MOSTLY(int, ipi_dummy_dev);
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index e36d20205bd7..beba0efb00b9 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -231,6 +231,10 @@ asmlinkage __visible void smp_callin(void)
 	riscv_ipi_enable();
 
 	numa_add_cpu(curr_cpuid);
+
+	pr_info("CPU%u: Booted secondary hartid %lu\n", curr_cpuid,
+		cpuid_to_hartid_map(curr_cpuid));
+
 	set_cpu_online(curr_cpuid, true);
 
 	/*
-- 
2.39.2