linux-kernel - Re: [PATCH] mm: Use strtobool for param parsing

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Date:   Mon, 28 Feb 2022 12:18:06 +0000
From:   "Dr. David Alan Gilbert" <linux@...blig.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     pasha.tatashin@...een.com, songmuchun@...edance.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Use strtobool for param parsing

* Andrew Morton (akpm@...ux-foundation.org) wrote:
> On Sun, 27 Feb 2022 18:10:39 +0000 "Dr. David Alan Gilbert" <linux@...blig.org> wrote:
> 
> > Use strtobool rather than open coding "on" and "off" parsing in
> > mm/hugetlb_vmemmap.c and mm/page_table_check.c.
> > 
> > Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> > ---
> >  mm/hugetlb_vmemmap.c  | 12 +-----------
> >  mm/page_table_check.c | 10 +---------
> >  2 files changed, 2 insertions(+), 20 deletions(-)
> > 
> > diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
> > index c540c21e26f5b..919411386e547 100644
> > --- a/mm/hugetlb_vmemmap.c
> > +++ b/mm/hugetlb_vmemmap.c
> > @@ -192,17 +192,7 @@ static int __init early_hugetlb_free_vmemmap_param(char *buf)
> >  		return 0;
> >  	}
> >  
> > -	if (!buf)
> > -		return -EINVAL;
> > -
> > -	if (!strcmp(buf, "on"))
> > -		hugetlb_free_vmemmap_enabled = true;
> > -	else if (!strcmp(buf, "off"))
> > -		hugetlb_free_vmemmap_enabled = false;
> > -	else
> > -		return -EINVAL;
> > -
> > -	return 0;
> > +	return strtobool(buf, &hugetlb_free_vmemmap_enabled);
> >  }
> >  early_param("hugetlb_free_vmemmap", early_hugetlb_free_vmemmap_param);
> 
> This part falls afoul of the changes in
> https://lkml.kernel.org/r/20211101031651.75851-3-songmuchun@bytedance.com

Hmm, yes that's quite different.

> > diff --git a/mm/page_table_check.c b/mm/page_table_check.c
> > index 3763bd077861a..2458281bff893 100644
> > --- a/mm/page_table_check.c
> > +++ b/mm/page_table_check.c
> > @@ -23,15 +23,7 @@ EXPORT_SYMBOL(page_table_check_disabled);
> >  
> >  static int __init early_page_table_check_param(char *buf)
> >  {
> > -	if (!buf)
> > -		return -EINVAL;
> > -
> > -	if (strcmp(buf, "on") == 0)
> > -		__page_table_check_enabled = true;
> > -	else if (strcmp(buf, "off") == 0)
> > -		__page_table_check_enabled = false;
> > -
> > -	return 0;
> > +	return strtobool(buf, &__page_table_check_enabled);
> >  }
> 
> But this works OK.

Thanks for taking it.

Dave

-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
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