linux-kernel - Re: [RFC 5/8] param: arch_get_boot_command

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Message-ID: <20081202174457.GA26005@flint.arm.linux.org.uk>
Date:	Tue, 2 Dec 2008 17:44:57 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Bryan Wu <cooloney@...nel.org>,
	Mikael Starvik <starvik@...s.com>,
	David Howells <dhowells@...hat.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Tony Luck <tony.luck@...el.com>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...inux.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Grant Grundler <grundler@...isc-linux.org>,
	Paul Mackerras <paulus@...ba.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Dike <jdike@...toit.com>, Ingo Molnar <mingo@...hat.com>,
	Chris Zankel <chris@...kel.net>
Subject: Re: [RFC 5/8] param: arch_get_boot_command_line()

On Tue, Dec 02, 2008 at 12:43:37PM +1030, Rusty Russell wrote:
> A couple of #if 0 around code I don't think can happen (even in the orignal
> place I moved it from?)

Looking at just those...

> @@ -697,32 +693,48 @@ void __init setup_arch(char **cmdline_p)
>  	 */
>  	if (tags->hdr.tag != ATAG_CORE)
>  		convert_to_tag_list(tags);
> +#if 0
>  	if (tags->hdr.tag != ATAG_CORE)
>  		tags = (struct tag *)&init_tags;
> +#endif

This prevents 'init_tags' from ever being used, which wil happen if
convert_to_tag_list() doesn't find a param_struct to convert.

> +
> +	if (mdesc->fixup)
> +		mdesc->fixup(mdesc, tags, &meminfo);
> +
> +#if 0
> +	if (tags->hdr.tag == ATAG_CORE) {
> +#endif

This may happen if the memory pointed to by 'tags' gets overwritten for
some reason by a machine specific fixup, but that'll probably never
happen.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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