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

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Date:	Thu, 4 Jun 2015 07:42:38 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Wei Yang <weiyang@...ux.vnet.ibm.com>
Cc:	yinghai@...nel.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, setup: code clean of e820_reserve_setup_data()


* 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
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