linux-kernel - Re: [PATCH 3/3] s390/mm: fix mis-accounting of pgtable

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Date:   Tue, 27 Nov 2018 09:13:50 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Li Wang <liwang@...hat.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Janosch Frank <frankja@...ux.vnet.ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 3/3] s390/mm: fix mis-accounting of pgtable_bytes

On Tue, Nov 27, 2018 at 11:05:15AM +0300, Kirill A. Shutemov wrote:
> > E.g. something like the below. If there aren't any objections, I will
> > provide a proper patch with changelog, etc.
> > 
> > diff --git a/kernel/fork.c b/kernel/fork.c
> > index 07cddff89c7b..d7aeec03c57f 100644
> > --- a/kernel/fork.c
> > +++ b/kernel/fork.c
> > @@ -647,8 +647,8 @@ static void check_mm(struct mm_struct *mm)
> >  	}
> >  
> >  	if (mm_pgtables_bytes(mm))
> > -		pr_alert("BUG: non-zero pgtables_bytes on freeing mm: %ld\n",
> > -				mm_pgtables_bytes(mm));
> > +		printk_once(KERN_ALERT "BUG: non-zero pgtables_bytes on freeing mm: %ld\n",
> > +			    mm_pgtables_bytes(mm));
> 
> You can be the first user of pr_alert_once(). Don't miss a chance! ;)

I didn't expect that that one exists. ;) Will do.