linux-kernel - Re: linux-next: parsing mem=700M broken

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Date:	Wed, 24 Dec 2008 13:30:27 +0100
From:	Ingo Oeser <ioe-lkml@...eria.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: parsing mem=700M broken

Hello Rusty,

On Wednesday 24 December 2008, Rusty Russell wrote:
>  void __init finish_e820_parsing(void)
>  {
> +	bool userdef;

maybe init with userdef = false;

> +	int i;
> +
> +	if (memlimit) {
> +		e820_remove_range(memlimit, ULLONG_MAX - memlimit, E820_RAM, 1);
> +		userdef = true;
> +	}
> +
> +	if (exactmap) {
> +#ifdef CONFIG_CRASH_DUMP
> +		/*
> +		 * If we are doing a crash dump, we still need to know
> +		 * the real mem size before original memory map is
> +		 * reset.
> +		 */
> +		saved_max_pfn = e820_end_of_ram_pfn();
> +#endif
> +		e820.nr_map = 0;
> +		userdef = true;
> +	}
> +
> +	for (i = 0; i < user_e820.nr_map; i++) {
> +		e820_add_region(user_e820.map[i].addr, user_e820.map[i].size,
> +				user_e820.map[i].type);
> +		userdef = true;
> +	}
> +
>  	if (userdef) {
>  		int nr = e820.nr_map;

Because here it might be used uninitialized.

Best Regards

Ingo Oeser
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