Kernelnewbies Digest, Vol 87, Issue 18

[yash omer]

Hello,
I have sent patch to the maintainers,
please tell me my patch is correct or there is something wrong
your response will help us building confidence in device driver development
Thank GregKH sir

On Fri, Feb 9, 2018 at 10:30 PM, <kernelnewbies-request at kernelnewbies.org>
wrote:

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> Today's Topics:
>
>    1. Re: Outdated URL in Documentation (Gustavo Leite)
>    2. Re: Outdated URL in Documentation (Greg KH)
>    3. Re: Outdated URL in Documentation (Gustavo Leite)
>    4. how to use CONFIG_KEXEC_JUMP options? (Gioh Kim)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 8 Feb 2018 19:24:09 -0200
> From: Gustavo Leite <gustavoleite.ti at gmail.com>
> To: Greg KH <greg at kroah.com>
> Cc: kernelnewbies at kernelnewbies.org
> Subject: Re: Outdated URL in Documentation
> Message-ID:
>         <CAEGv8HhRKLp0jnsBPTRFF=BZdvD-ve_OH7rRWKA35SDirEMqmw at mail.
> gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> 2018-02-08 11:48 GMT-02:00 Greg KH <greg at kroah.com>:
> > Sure, please feel free to send a patch to do so.
>
> This is my first time in the process. Please tell me if I'm
> doing something wrong.
>
> I commited the changes on top of Linus (torvalds/linux) tree
> using the --signoff flag and generated the patch. Now I must
> send it to linux-doc at vger.kernel.org?
>
> - Gustavo Leite
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 9 Feb 2018 08:19:48 +0100
> From: Greg KH <greg at kroah.com>
> To: Gustavo Leite <gustavoleite.ti at gmail.com>
> Cc: kernelnewbies at kernelnewbies.org
> Subject: Re: Outdated URL in Documentation
> Message-ID: <20180209071948.GA8143 at kroah.com>
> Content-Type: text/plain; charset=us-ascii
>
> On Thu, Feb 08, 2018 at 07:24:09PM -0200, Gustavo Leite wrote:
> > 2018-02-08 11:48 GMT-02:00 Greg KH <greg at kroah.com>:
> > > Sure, please feel free to send a patch to do so.
> >
> > This is my first time in the process. Please tell me if I'm
> > doing something wrong.
> >
> > I commited the changes on top of Linus (torvalds/linux) tree
> > using the --signoff flag and generated the patch. Now I must
> > send it to linux-doc at vger.kernel.org?
>
> Have you read the "How to write your first kernel patch" tutorial page
> on the kernelnewbies.org site?  That should answer all of your
> qeustions.
>
> And yes, you do now need to send the patch to that address, use the
> scripts/get_maintainer.pl tool on your patch to see the proper people to
> send it to.
>
> Good luck!
>
> greg k-h
>
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 9 Feb 2018 08:20:11 -0200
> From: Gustavo Leite <gustavoleite.ti at gmail.com>
> To: Greg KH <greg at kroah.com>
> Cc: kernelnewbies at kernelnewbies.org
> Subject: Re: Outdated URL in Documentation
> Message-ID:
>         <CAEGv8HgDf6HLm55H2qfENBLJJ+SJ=bginRoQMF2_-B9aP7CUQA at mail.
> gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> 2018-02-09 5:19 GMT-02:00 Greg KH <greg at kroah.com>:
> > Have you read the "How to write your first kernel patch" tutorial page
> > on the kernelnewbies.org site?  That should answer all of your
> > qeustions.
>
> I'm going to read it before sending to the list.
>
> 2018-02-09 5:19 GMT-02:00 Greg KH <greg at kroah.com>:
> > Good luck!
>
> Thank you!
>
> - Gustavo Leite
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 9 Feb 2018 12:57:25 +0100
> From: Gioh Kim <gurugio at gmail.com>
> To: kernelnewbies at kernelnewbies.org
> Subject: how to use CONFIG_KEXEC_JUMP options?
> Message-ID:
>         <CANc8B5Ohj2BSO8VuZNdtU0d6igy18Uo+79Rm8mtnyfy5N8TMqA at mail.
> gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello,
>
> "echo c > /proc/sysrq-trigger" generates the kernel dump but it reboots the
> system.
> I'd like to generate kernel dump without system reboot.
>
> I found the CONFIG_KEXEC_JUMP option that described as "it is possible to
> jump to the kdump kernel and generate kernel dump, and come back to the
> operating kernel".
> So I enabled CONFIG_KEXEC_JUMP option but I cannot figure out how to come
> back to the operating kernel.
>
> For example, I did following sequences after reading kexec manual page.
>
> 1. kexec --load=/boot/vmlinuz --initrd=/boot/initrd --reuse-cmdline
> 2. kexec -e
> 3. now kdump kernel is running
> 4. kexec --load-jump-back-helper --entry=<ADDRESS>
> 5. kexec -e
>
> I can jump to kdump kernel with step 1 and step 2.
> kexec manual says I need an entry address.
> I don't know what address I should use.
>
> Does anybody know how to use CONFIG_KEXEC_JUMP options and kexec to jump
> between kdump kernel and operating kernel?
>
>
> --
>
> Best regards,
> Gioh Kim
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