linux-kernel - Re: [PATCH] x86, setup: code clean of e820_reserve_setup

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Date:	Thu, 4 Jun 2015 15:07:18 +0800
From:	Wei Yang <weiyang@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Wei Yang <weiyang@...ux.vnet.ibm.com>, yinghai@...nel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, setup: code clean of e820_reserve_setup_data()

On Thu, Jun 04, 2015 at 07:42:38AM +0200, Ingo Molnar wrote:
>
>* Wei Yang <weiyang@...ux.vnet.ibm.com> wrote:
>
>> pa_data and found are highly related, so there is no need to set a found
>> flag.
>> 
>> This patch removes the found and just return when pa_data is NULL.
>> 
>> Signed-off-by: Wei Yang <weiyang@...ux.vnet.ibm.com>
>> ---
>>  arch/x86/kernel/setup.c |    7 +++----
>>  1 file changed, 3 insertions(+), 4 deletions(-)
>> 
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 0a2421c..b95e653 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -461,19 +461,18 @@ static void __init e820_reserve_setup_data(void)
>>  {
>>  	struct setup_data *data;
>>  	u64 pa_data;
>> -	int found = 0;
>>  
>>  	pa_data = boot_params.hdr.setup_data;
>> +	if (!pa_data)
>> +		return;
>> +
>>  	while (pa_data) {
>>  		data = early_memremap(pa_data, sizeof(*data));
>>  		e820_update_range(pa_data, sizeof(*data)+data->len,
>>  			 E820_RAM, E820_RESERVED_KERN);
>> -		found = 1;
>>  		pa_data = data->next;
>>  		early_iounmap(data, sizeof(*data));
>>  	}
>> -	if (!found)
>> -		return;
>>  
>>  	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
>>  	memcpy(&e820_saved, &e820, sizeof(struct e820map));
>
>This patch does not apply to Linus's latest tree.

Thanks Ingo.

Rebased on top of v4.1-rc6.

>
>Thanks,
>
>	Ingo

-- 
Richard Yang
Help you, Help me

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