linux-kernel - Re: [PATCH 05/11] ARM: Introduce CPU_METHOD_OF

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Message-ID: <527C1567.8000005@codeaurora.org>
Date:	Thu, 07 Nov 2013 14:34:15 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Josh Cartwright <joshc@...eaurora.org>
CC:	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.org,
	Rohit Vaswani <rvaswani@...eaurora.org>,
	linux-kernel@...r.kernel.org, David Brown <davidb@...eaurora.org>
Subject: Re: [PATCH 05/11] ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu
 hotplug/smp

On 11/06/13 17:50, Josh Cartwright wrote:
> On Fri, Nov 01, 2013 at 03:08:53PM -0700, Stephen Boyd wrote:
>> diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
>> index f35906b..71a8592 100644
>> --- a/arch/arm/kernel/devtree.c
>> +++ b/arch/arm/kernel/devtree.c
>> @@ -25,6 +25,7 @@
>>  #include <asm/smp_plat.h>
>>  #include <asm/mach/arch.h>
>>  #include <asm/mach-types.h>
>> +#include <asm/smp.h>
>>  
>>  void __init early_init_dt_add_memory_arch(u64 base, u64 size)
>>  {
>> @@ -63,6 +64,36 @@ void __init arm_dt_memblock_reserve(void)
>>  	}
>>  }
>>  
>> +#ifdef CONFIG_SMP
>> +extern struct of_cpu_method __cpu_method_of_table[];
>> +
>> +static const struct of_cpu_method __cpu_method_of_table_sentinel
>> +	__used __section(__cpu_method_of_table_end);
> Having a sentinel allocated into the linked image makes a lot of sense
> in other cases (IRQCHIP/CLOCKSOURCE_OF_DECLARE, etc), where it's used to
> terminate an of_device_id table (as is expected by of_match_table and
> friends).
>
> In this case, however, you aren't building a match table, so having a
> sentinel allocated isn't necessary.  I'd suggest bookending the table
> with a VMLINUX_SYMBOL(__cpu_method_of_table_end) instead.
>
> A whole 2 pointers worth of savings!
>

Yes, will do. Thanks.

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