Re: [PATCH v9 1/9] kho: make debugfs interface optional

[Pasha Tatashin]

On Fri, Nov 7, 2025 at 7:00 AM Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> wrote:
>
> > Hi, Pasha
> >
> > In our previous discussion, we talked about counting the number of times
> > the kernel is rebooted via kexec. At that time, you suggested adding a
> > variable in debugfs to keep track of this count.
> > However, since debugfs is now optional, where would be an appropriate
> > place to store this variable?
>
> It is an optional config and can still be enabled if the live update
> reboot number value needs to be accessed through debugfs. However,
> given that debugfs does not guarantee a stable interface, tooling
> should not be built to require these interfaces.
>
> In the WIP LUO [1] I have, I pr_info() the live update number during
> boot and also store it in the incoming LUO FDT tree, which can also be
> accessed through this optional debugfs interface.
>
> The pr_info message appears like this during boot:
> [    0.000000] luo: Retrieved live update data, liveupdate number: 17
>
> Pasha

Forgot to add link to WIP LUOv5:
[1] https://github.com/soleen/linux/tree/luo/v5rc04