linux-kernel - Re: [PATCH] sysrq: Auto release device node using _

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Date: Thu, 11 Apr 2024 20:25:10 +0200
From: Roman Storozhenko <romeusmeister@...il.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: jirislaby@...nel.org, Julia.Lawall@...ia.fr, skhan@...uxfoundation.org, 
	javier.carrasco.cruz@...il.com, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org
Subject: Re: [PATCH] sysrq: Auto release device node using __free attribute

Hi Greg,

This is the output of the checkpatch:
hedin@...top:~/prj/linux-next$ ./scripts/checkpatch.pl --strict
~/lkmp/course_tasks/coccinele/patches/sysrq/v1/*
--------------------------------------------------------------------------------
/home/hedin/lkmp/course_tasks/coccinele/patches/sysrq/v1/0000-cover-letter.patch
--------------------------------------------------------------------------------
total: 0 errors, 0 warnings, 0 checks, 0 lines checked

/home/hedin/lkmp/course_tasks/coccinele/patches/sysrq/v1/0000-cover-letter.patch
has no obvious style problems and is ready for submission.
------------------------------------------------------------------------------------------------------------------------
/home/hedin/lkmp/course_tasks/coccinele/patches/sysrq/v1/0001-sysrq-Auto-release-device-node-using-__free-attribut.patch
------------------------------------------------------------------------------------------------------------------------
total: 0 errors, 0 warnings, 0 checks, 16 lines checked

/home/hedin/lkmp/course_tasks/coccinele/patches/sysrq/v1/0001-sysrq-Auto-release-device-node-using-__free-attribut.patch
has no obvious style problems and is ready for submission.

Before sending this patch to the mailing list I sent it to me,
downloaded from the email, and then applied atop of the tree using git
am. Encountered no issues.

I can guess that you checked the whole file and got some issues. But
those are not related to my changes.

Thanks,
Roman

On Thu, Apr 11, 2024 at 8:10 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Thu, Apr 11, 2024 at 08:02:56PM +0200, Roman Storozhenko wrote:
> > Add a cleanup function attribute '__free(device_node)' to the device node
> > pointer initialization statement and remove the pairing cleanup function
> > call of 'of_node_put' at the end of the function.
> > The '_free()' attrubute is introduced by scope-based resource management
> > in-kernel framework implemented in 'cleanup.h'. A pointer marked with
> > '__free()' attribute makes a compiler insert a cleanup function call
> > to the places where the pointer goes out of the scope. This feature
> > allows to get rid of manual cleanup function calls.
> >
> > Suggested-by: Julia.Lawall <Julia.Lawall@...ia.fr>
> > Signed-off-by: Roman Storozhenko <romeusmeister@...il.com>
> > ---
> > This patch targets the next tree:
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > tag: next-20240411
> > ---
> >  drivers/tty/sysrq.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
> > index 02217e3c916b..1d1261f618c0 100644
> > --- a/drivers/tty/sysrq.c
> > +++ b/drivers/tty/sysrq.c
> > @@ -758,11 +758,12 @@ static void sysrq_detect_reset_sequence(struct sysrq_state *state,
> >  static void sysrq_of_get_keyreset_config(void)
> >  {
> >       u32 key;
> > -     struct device_node *np;
> >       struct property *prop;
> >       const __be32 *p;
> >
> > -     np = of_find_node_by_path("/chosen/linux,sysrq-reset-seq");
> > +     struct device_node *np __free(device_node) =
> > +             of_find_node_by_path("/chosen/linux,sysrq-reset-seq");
> > +
>
> Did you run this through checkpatch.pl?  Please do so.
>


-- 
Kind regards,
Roman Storozhenko