[PATCH] riscv: export boot_cpu_hartid

From: Klara Modin <klarasmodin@gmail.com>
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, alex@ghiti.fr, conor.dooley@microchip.com,
	valentina.fernandezalanis@microchip.com
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Klara Modin <klarasmodin@gmail.com>,
	stable@vger.kernel.org
Subject: [PATCH] riscv: export boot_cpu_hartid
Date: Tue, 17 Jun 2025 14:58:47 +0200	[thread overview]
Message-ID: <20250617125847.23829-1-klarasmodin@gmail.com> (raw)

The mailbox controller driver for the Microchip Inter-processor
Communication can be built as a module. It uses cpuid_to_hartid_map and
commit 4783ce32b080 ("riscv: export __cpuid_to_hartid_map") enables that
to work for SMP. However, cpuid_to_hartid_map uses boot_cpu_hartid on
non-SMP kernels and this driver can be useful in such configurations[1].

Export boot_cpu_hartid so the driver can be built as a module on non-SMP
kernels as well.

Link: https://lore.kernel.org/lkml/20250617-confess-reimburse-876101e099cb@spud/ [1]
Cc: stable@vger.kernel.org
Fixes: e4b1d67e7141 ("mailbox: add Microchip IPC support")
Signed-off-by: Klara Modin <klarasmodin@gmail.com>
---
 arch/riscv/kernel/setup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index f7c9a1caa83e..14888e5ea19a 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -50,6 +50,7 @@ atomic_t hart_lottery __section(".sdata")
 #endif
 ;
 unsigned long boot_cpu_hartid;
+EXPORT_SYMBOL_GPL(boot_cpu_hartid);
 
 /*
  * Place kernel memory regions on the resource tree so that
-- 
2.49.0


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