linux-kernel - Re: [PATCH] MIPS: paravirt: Fix undefined reference to smp

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Date:   Tue, 13 Sep 2016 16:49:02 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Matt Redfearn <matt.redfearn@...tec.com>
Cc:     linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] MIPS: paravirt: Fix undefined reference to smp_bootstrap

On Mon, Sep 05, 2016 at 03:43:40PM +0100, Matt Redfearn wrote:

> If the paravirt machine is compiles without CONFIG_SMP, the following
> linker error occurs
> 
> arch/mips/kernel/head.o: In function `kernel_entry':
> (.ref.text+0x10): undefined reference to `smp_bootstrap'
> 
> due to the kernel entry macro always including SMP startup code.
> Wrap this code in CONFIG_SMP to fix the error.
> 
> Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>

Thanks, applied.  This patch should be applied to 3.16+ also so I've
added a Cc: stable... tag.

  Ralf

>  arch/mips/include/asm/mach-paravirt/kernel-entry-init.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
> index 2f82bfa3a773..c9f5769dfc8f 100644
> --- a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
> +++ b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
> @@ -11,11 +11,13 @@
>  #define CP0_EBASE $15, 1
>  
>  	.macro  kernel_entry_setup
> +#ifdef CONFIG_SMP
>  	mfc0	t0, CP0_EBASE
>  	andi	t0, t0, 0x3ff		# CPUNum
>  	beqz	t0, 1f
>  	# CPUs other than zero goto smp_bootstrap
>  	j	smp_bootstrap
> +#endif /* CONFIG_SMP */
>  
>  1:
>  	.endm
> -- 
> 2.7.4
>