linux-kernel - Re: [RFC patch] MIPS/netlogic: dont setup boot CPU twice

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Date:	Fri, 5 Aug 2011 00:21:41 +0530
From:	"Jayachandran C." <jayachandranc@...logicmicro.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mips@...ux-mips.org
Subject: Re: [RFC patch] MIPS/netlogic: dont setup boot CPU twice

> 
> When do smp setup, check for boot CPU is added, then it is impossible to be
> initialized twice.
> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>
> ---
>  arch/mips/netlogic/xlr/smp.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/mips/netlogic/xlr/smp.c b/arch/mips/netlogic/xlr/smp.c
> index b495a7f..e6f8c62 100644
> --- a/arch/mips/netlogic/xlr/smp.c
> +++ b/arch/mips/netlogic/xlr/smp.c
> @@ -167,6 +167,8 @@ void __init nlm_smp_setup(void)
> 
>        num_cpus = 1;
>        for (i = 0; i < NR_CPUS; i++) {
> +               if (i == boot_cpu)
> +                       continue;
>                if (nlm_cpu_ready[i]) {
>                        cpu_set(i, phys_cpu_present_map);
>                        __cpu_number_map[i] = num_cpus;

The nlm_cpu_ready[] entry is not set for the boot_cpu, it is set for only 
the secondary cpus in smpboot.S.  The code works as it is, but your patch
makes it more explicit.

My only commnet is that it might look better if you combine both the if checks.

JC.
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