linux-kernel - Re: [PATCHv2 1/2] mm: introduce get_task_exe

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Message-ID: <20160823145235.t3xs3fcf24qkaaw2@mguzik>
Date:   Tue, 23 Aug 2016 16:52:36 +0200
From:   Mateusz Guzik <mguzik@...hat.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Richard Guy Briggs <rgb@...hat.com>, ebiederm@...ssion.com,
        sgrubb@...hat.com, pmoore@...hat.com, eparis@...hat.com,
        luto@...capital.net, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCHv2 1/2] mm: introduce get_task_exe_file

On Tue, Aug 23, 2016 at 04:48:13PM +0200, Oleg Nesterov wrote:
> On 08/23, Mateusz Guzik wrote:
> >
> > +struct file *get_task_exe_file(struct task_struct *task)
> > +{
> > +	struct file *exe_file = NULL;
> > +	struct mm_struct *mm;
> > +
> > +	task_lock(task);
> > +	mm = task->mm;
> > +	if (mm) {
> > +		if (!(task->flags & PF_KTHREAD))
> > +			exe_file = get_mm_exe_file(mm);
> > +	}
> > +	task_unlock(task);
> > +	return exe_file;
> > +}
> 
> I can't believe I am going to comment the coding style but I can't resist ;)
> 
> 	if (mm && !(task->flags & PF_KTHREAD)))
> 		exe_file = get_mm_exe_file(mm);
> 
> looks a bit simpler to me. But this is purely cosmetic and subjective,
> both patches look good to me.
> 

Actually I did it for some consistency with get_task_mm.

The check can likely be done prior to taking the lock in both functions
and that would clean them up a little bit, but I wanted to avoid nit
picking... :>

> Acked-by: Oleg Nesterov <oleg@...hat.com>
> 

Thanks

-- 
Mateusz Guzik