linux-kernel - Re: [PATCH] riscv: export boot_cpu

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Message-ID: <20250619-rummage-cache-93f48564b7fb@wendy>
Date: Thu, 19 Jun 2025 11:25:16 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Klara Modin <klarasmodin@...il.com>
CC: <paul.walmsley@...ive.com>, <palmer@...belt.com>, <aou@...s.berkeley.edu>,
	<alex@...ti.fr>, <valentina.fernandezalanis@...rochip.com>,
	<linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<stable@...r.kernel.org>
Subject: Re: [PATCH] riscv: export boot_cpu_hartid

On Tue, Jun 17, 2025 at 02:58:47PM +0200, Klara Modin wrote:
> 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@...r.kernel.org
> Fixes: e4b1d67e7141 ("mailbox: add Microchip IPC support")

I'm not sure that this fixes tag is really right, but I have no better
suggestions
Acked-by: Conor Dooley <conor.dooley@...rochip.com>

> Signed-off-by: Klara Modin <klarasmodin@...il.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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