linux-kernel - Re: [PATCH] selftests: mm: fix the incorrect usage() info of khugepaged

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Message-Id: <20241017001441.2db5adaaa63dc3faa0934204@linux-foundation.org>
Date: Thu, 17 Oct 2024 00:14:41 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: Nanyong Sun <sunnanyong@...wei.com>, shuah@...nel.org,
 zokeefe@...gle.com, linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, wangkefeng.wang@...wei.com
Subject: Re: [PATCH] selftests: mm: fix the incorrect usage() info of
 khugepaged

On Thu, 17 Oct 2024 12:31:31 +0530 Anshuman Khandual <anshuman.khandual@....com> wrote:

> On 10/15/24 07:32, Nanyong Sun wrote:
> > The mount option of tmpfs should be huge=advise, not madvise
> > which is not supported and may mislead the users.
> 
> Agreed.
> 
> > 
> > Fixes: 1b03d0d558a2 ("selftests/vm: add thp collapse file and tmpfs testing")
> 
> But nothing is really broken here. This just fixes usage information.

The usage information is broken!

> Please drop the "Fixes:".

Fixes: is appropriate.  It tells people which commit introduced the error.

I don't think it's serious enough to add a cc:stable.  Others might disagree.

> > Signed-off-by: Nanyong Sun <sunnanyong@...wei.com>
> > ---
> >  tools/testing/selftests/mm/khugepaged.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c
> > index 56d4480e8d3c..8a4d34cce36b 100644
> > --- a/tools/testing/selftests/mm/khugepaged.c
> > +++ b/tools/testing/selftests/mm/khugepaged.c
> > @@ -1091,7 +1091,7 @@ static void usage(void)
> >  	fprintf(stderr, "\n\t\"file,all\" mem_type requires kernel built with\n");
> >  	fprintf(stderr,	"\tCONFIG_READ_ONLY_THP_FOR_FS=y\n");
> >  	fprintf(stderr, "\n\tif [dir] is a (sub)directory of a tmpfs mount, tmpfs must be\n");
> > -	fprintf(stderr,	"\tmounted with huge=madvise option for khugepaged tests to work\n");
> > +	fprintf(stderr,	"\tmounted with huge=advise option for khugepaged tests to work\n");
> >  	fprintf(stderr,	"\n\tSupported Options:\n");
> >  	fprintf(stderr,	"\t\t-h: This help message.\n");
> >  	fprintf(stderr,	"\t\t-s: mTHP size, expressed as page order.\n");
> 
> Without the above "Fixes:" tag,
> 
> Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>

Thanks.