linux-kernel - Re: [PATCH] arm: Fix linux-next compile error in arch/arm/common/gic.c

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Date:	Tue, 3 Jan 2012 08:44:01 +0800
From:	Yang Bai <hamo.by@...il.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: Fix linux-next compile error in arch/arm/common/gic.c

On Tue, Jan 3, 2012 at 12:33 AM, Joerg Roedel <joerg.roedel@....com> wrote:
> With CONFIG_SMP=n the following compile error occurs:
>
>  CC      arch/arm/common/gic.o
> arch/arm/common/gic.c: In function 'gic_init_bases':
> arch/arm/common/gic.c:679:4: error: implicit declaration of function 'cpu_logical_map' [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
>
> This patch fixes the problem.
>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/arm/common/gic.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
> index b2dc2dd..b33f6b0 100644
> --- a/arch/arm/common/gic.c
> +++ b/arch/arm/common/gic.c
> @@ -676,7 +676,10 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
>                }
>
>                for_each_possible_cpu(cpu) {
> -                       unsigned long offset = percpu_offset * cpu_logical_map(cpu);
> +                       unsigned long offset = percpu_offset;
> +#ifdef CONFIG_SMP
> +                       offset *= cpu_logical_map(cpu);
> +#endif
>                        *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
>                        *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
>                }
> --
> 1.7.5.4
>
>

Is this the right way to fix it? Or shall we do like this:

#ifdef CONFIG_SMP
...
#else
#define cpu_logical_map() 1
#endif

and leave the gic.c code unchanged.

Thanks,
Yang
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