linux-kernel - Re: [PATCH] RISC-V: Add preprocessor directives for boot_sec

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Date:   Thu, 2 Aug 2018 11:13:25 -0700
From:   Atish Patra <atish.patra@....com>
To:     Zong Li <zong@...estech.com>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "hch@...radead.org" <hch@...radead.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "greentime@...estech.com" <greentime@...estech.com>
Subject: Re: [PATCH] RISC-V: Add preprocessor directives for boot_sec_cpu

On 8/2/18 8:23 AM, Zong Li wrote:
> The boot_sec_cpu is for hutplug CPU on SMP system. It should
> be conditional compiling. Otherwise, it causes undefined reference
> to `smp_callin' when compiling uniprocessor kernel.
> 
> Signed-off-by: Zong Li <zong@...estech.com>
> ---
>   arch/riscv/kernel/head.S | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> index 11066d5..9b6f601 100644
> --- a/arch/riscv/kernel/head.S
> +++ b/arch/riscv/kernel/head.S
> @@ -154,6 +154,7 @@ END(_start)
>   .section .text
>   .global boot_sec_cpu
>   
> +#ifdef CONFIG_HOTPLUG_CPU
>   boot_sec_cpu:
>   	/* clear all pending flags */
>   	csrw sip, zero
> @@ -162,6 +163,7 @@ boot_sec_cpu:
>   	fence
>   
>   	tail smp_callin
> +#endif
>   
>   __PAGE_ALIGNED_BSS
>   	/* Empty zero page */
> 

Thanks for the fix. If you don't mind, I would like to merge it on top
of my cpu hotplug patch and resubmit together to avoid confusion.


Regards,
Atish