linux-kernel - Re: [PATCH 2/3] [kexec-tools] Pass vmcoreinfo's address and size

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Message-ID: <20071019033842.GG692@verge.net.au>
Date:	Fri, 19 Oct 2007 12:38:42 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	tachibana@....nes.nec.co.jp
Cc:	Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>,
	Don Zickus <dzickus@...hat.com>,
	Neil Horman <nhorman@...hat.com>,
	Dan Aloni <da-x@...atomic.org>,
	Bernhard Walle <bwalle@...e.de>,
	kexec-ml <kexec@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/3] [kexec-tools] Pass vmcoreinfo's address and size

On Thu, Oct 18, 2007 at 06:14:07PM +0900, tachibana@....nes.nec.co.jp wrote:
> 
> Hi Simon,
> 
> On Thu, 18 Oct 2007 14:37:41 +0900, Simon Horman <horms@...ge.net.au> wrote:
> > On Wed, Oct 17, 2007 at 02:16:19PM +0900, Ken'ichi Ohmichi wrote:
> > > 
> > > Hi Simon,
> > > 
> > > Simon Horman wrote:
> > > > On Wed, Aug 22, 2007 at 09:13:39PM +0900, Ken'ichi Ohmichi wrote:
> > > >> [2/3] [kexec-tools] Pass vmcoreinfo's address and size
> > > >> The patch is for kexec-tools-testing-20070330.
> > > >> (http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/)
> > > >> kexec command gets the address and size of the vmcoreinfo data from
> > > >> /sys/kernel/vmcoreinfo, and passes them to the second kernel through
> > > >> ELF header of /proc/vmcore. When the second kernel is booting, the
> > > >> kernel gets them from the ELF header and creates vmcoreinfo's PT_NOTE
> > > >> segment into /proc/vmcore.
> > > > 
> > > > Sorry for the long delay, I completely missed this patch.
> > > > 
> > > > The kexec-tools change seems ok to me. What is the status of
> > > > the kernel portion of the change?
> > > 
> > > The kernel portion is merged into linux-2.6.23-mm1.
> > > According to Andrew's mail "-mm merge plans for 2.6.24",  its status is
> > > "The infamous misc.  Will re-review and will merge basically all of them".
> > > 
> > > http://www.ussg.iu.edu/hypermail/linux/kernel/0710.0/0313.html
> > > 
> > > 
> > > > Do you still want the kexec-tools portion applied?
> > > 
> > > Yes, I hope so.
> > 
> > Thanks, applied :-)
> 
> Thank you for applying ;-)
> 
> But it has the compatibility problem that the kexec command fails on
> kernels which don't have /sys/kernel/vmcoreinfo:
> 
>  # ls /sys/kernel/
>  debug  kexec_crash_loaded  kexec_loaded  security  uevent_helper 
>  uevent_seqnum
>  #
>  (There is not /sys/kernel/vmcoreinfo.)
> 
>  #
>  # kexec -p --args-linux vmlinuz --initrd=initrd.img
>  Could not open "/sys/kernel/vmcoreinfo": No such file or directory
>  #
> 
> To fix the problem, could you please apply the attached patch ?
> The fixed part is the same as the patch in the following mail.

Thanks, applied.
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