linux-kernel - Re: [patch 29/29] initrd: Fix virtual/physical mix-up in overwrite test

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Message-Id: <20080725.003526.39154055.anemo@mba.ocn.ne.jp>
Date:	Fri, 25 Jul 2008 00:35:26 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	geert@...ux-m68k.org, ralf@...ux-mips.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 29/29] initrd: Fix virtual/physical mix-up in overwrite
 test

On Thu, 17 Jul 2008 21:16:36 +0200, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>  	if (initrd_start && !initrd_below_start_ok &&
> -			initrd_start < min_low_pfn << PAGE_SHIFT) {
> +	    page_to_pfn(virt_to_page(initrd_start)) < min_low_pfn) {
>  		printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
> -		    "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
> +		    "disabling it.\n",
> +		    page_to_pfn(virt_to_page(initrd_start)), min_low_pfn);
>  		initrd_start = 0;
>  	}

This patch causes warnings on mips:

linux/init/main.c: In function 'start_kernel':
linux/init/main.c:633: warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast
linux/init/main.c:636: warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast

Because an argument of mips virt_to_phys() is an pointer and
initrd_start is unsigned long.  It seems most (all?) arch's
virt_to_phys() casts its argument to unsigned long internally.  Should
mips follow?

---
Atsushi Nemoto
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