linux-kernel - Re: [PATCH v2][next] tty: sunsu: Simplify device_node cleanup by using _

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Message-ID: <CAE8VWiJkDm9ezho6wNT=NCycTccgru4HMkVYS_nEYC38DYOy3g@mail.gmail.com>
Date: Wed, 15 May 2024 01:07:59 +0530
From: Shresth Prasad <shresthprasad7@...il.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	davem@...emloft.net, jirislaby@...nel.org, sparclinux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, 
	javier.carrasco.cruz@...il.com, skhan@...uxfoundation.org, 
	Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH v2][next] tty: sunsu: Simplify device_node cleanup by
 using __free

On Sat, May 4, 2024 at 9:32 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Fri, May 03, 2024 at 02:31:22PM +0530, Shresth Prasad wrote:
> > On Fri, May 3, 2024 at 11:04 AM Greg KH <gregkh@...uxfoundationorg> wrote:
> > >
> > > On Thu, May 02, 2024 at 10:21:16PM +0530, Shresth Prasad wrote:
> > > > On Thu, May 2, 2024 at 9:35 PM Ilpo Järvinen
> > > > <ilpo.jarvinen@...ux.intel.com> wrote:
> > > > >
> > > > > On Wed, 1 May 2024, Shresth Prasad wrote:
> > > > >
> > > > > > Add `__free` function attribute to `ap` and `match` pointer
> > > > > > initialisations which ensure that the pointers are freed as soon as they
> > > > > > go out of scope, thus removing the need to manually free them using
> > > > > > `of_node_put`.
> > > > > >
> > > > > > This also removes the need for the `goto` statement and the `rc`
> > > > > > variable.
> > > > > >
> > > > > > Tested using a qemu x86_64 virtual machine.
> > > > >
> > > > > Eh, how can you test this with an x86_64 VM ???
> > > > >
> > > > > config SERIAL_SUNSU
> > > > >         tristate "Sun SU serial support"
> > > > >         depends on SPARC && PCI
> > > > >
> > > >
> > > > By that, I mean that I compiled the kernel and ran the produced bzImage
> > > > on a x86_64 qemu machine.
> > >
> > > But you didn't include the driver you were testing :(
> > >
> > > > I unfortunately don't have the hardware to test it on, but I don't
> > > > think the change is complex enough to require testing on real hardware
> > > > (unless I'm assuming incorrectly).
> > >
> > > That's why I asked if you had tested this or not...
> > >
> >
> > Really sorry about that, I thought compiling and booting would qualify
> > as testing. What should I be doing then?
>
> Compiling and booting the code you change would be a good start :)
>
> thanks,
>
> greg k-h

I've managed to successfully cross compile the kernel for sparc, along
with this module, but I couldn't figure out how to boot the generated
kernel image.

I looked around for quite a while but couldn't find any straightforward
guide suggesting how I would go about booting my own kernel on
qemu-system-sparc.

I would really appreciate it if you could point me in the right direction.

Regards,
Shresth