linux-kernel - Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based hibernation

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Date:	Wed, 01 Aug 2007 09:16:13 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>, david@...g.hm,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATH 0/1] Kexec jump - v2 - the first step to kexec based
	hibernation

On Tue, 2007-07-31 at 04:52 -0600, Eric W. Biederman wrote:
> "Huang, Ying" <ying.huang@...el.com> writes:
> 
> > On Tue, 2007-07-31 at 11:10 +0200, Pavel Machek wrote:
> >> > Index: kexec-tools-1.101/kexec/arch/i386/crashdump-x86.c
> >> > ===================================================================
> >> > --- kexec-tools-1.101.orig/kexec/arch/i386/crashdump-x86.c 2007-07-08
> > 23:00:25.000000000 +0800
> >> > +++ kexec-tools-1.101/kexec/arch/i386/crashdump-x86.c 2007-07-14
> > 17:06:45.000000000 +0800
> >> > @@ -428,6 +428,29 @@
> >> >  	return 0;
> >> >  }
> >> >  
> >> > +/* Adds the kexec_backup= command line parameter to command line. */
> >> > +static int cmdline_add_backup(char *cmdline, unsigned long addr)
> >> > +{
> >> > +	int cmdlen, len, align = 1024;
> >> > +	char str[30], *ptr;
> >> > +
> >> > +	/* Passing in kexec_backup=xxxK format. Saves space required
> >> > +	 * in cmdline. Ensure 1K alignment*/
> >> > +	if (addr%align)
> >> > +		return -1;
> >> > +	addr = addr/align;
> >> > +	ptr = str;
> >> > +	strcpy(str, " kexec_backup=");
> >> > +	ptr += strlen(str);
> >> > +	ultoa(addr, ptr);
> >> > +	strcat(str, "K");
> >> > +	len = strlen(str);
> >> > +	cmdlen = strlen(cmdline) + len;
> >> > +	if (cmdlen > (COMMAND_LINE_SIZE - 1))
> >> > +		die("Command line overflow\n");
> >> > +	strcat(cmdline, str);
> >> > +	return 0;
> >> > +}
> >> 
> >> This part did not apply for me -- it seems crashdump related and I did
> >> not have that applied. Is it critical?
> >
> > This is needed for kexec_jump to work properly. Which version of
> > kexec-tools do you use? This patch is against 1.101. The kdump patch
> > must be applied before this patch is applied.
> 
> Please work against the kexec-tools-testing tree, if you can.
> All of the outstanding patches should be there.

OK, I will work against the kexec-tools-testing tree in the next
version.

Best Regards,
Huang Ying
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