linux-kernel - Re: [PATCH 1/4] selftests/resctrl: Return error if memory is not allocated

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Message-ID: <a4b44d-23f8-6df1-e494-908fbd43b732@linux.intel.com>
Date:   Tue, 14 Feb 2023 11:32:38 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Reinette Chatre <reinette.chatre@...el.com>
cc:     linux-kselftest@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>, Babu Moger <babu.moger@....com>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Subject: Re: [PATCH 1/4] selftests/resctrl: Return error if memory is not
 allocated

On Mon, 13 Feb 2023, Reinette Chatre wrote:

> I do not see a why two patch series are needed for
> the resctrl fixes. It may make it easier for everybody if
> it is handled as one patch series (with fixes first)?

Ok, I can put the fixes and cleanups into one series.

> On 2/8/2023 1:30 AM, Ilpo Järvinen wrote:
> > From: Fenghua Yu <fenghua.yu@...el.com>
> > 
> > malloc_and_init_memory() in fill_buf isn't checking if memalign()
> > successfully allocated memory or not before accessing the memory.
> > 
> > Check the return value of memalign() and return NULL if allocating
> > aligned memory fails.
> > 
> > Fixes: a2561b12fe39 ("selftests/resctrl: Add built in benchmark")
> > Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> 
> Missing your Signed-off-by?

These were intentionally. When I didn't modify the original patch at 
all during forward porting it, I just kept the original From and SoB as 
is. But from the doc you pointed me to, I see now x86 wants also handlers 
sobs.

> > ---
> >  tools/testing/selftests/resctrl/fill_buf.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
> > index 56ccbeae0638..f4880c962ec4 100644
> > --- a/tools/testing/selftests/resctrl/fill_buf.c
> > +++ b/tools/testing/selftests/resctrl/fill_buf.c
> > @@ -68,6 +68,8 @@ static void *malloc_and_init_memory(size_t s)
> >  	size_t s64;
> >  
> >  	void *p = memalign(PAGE_SIZE, s);
> 
> This may also be a good time to stop using an obsolete call?

Sure, I can add another patch to change that to posix_memalign().

> > +	if (!p)
> > +		return p;
> 
> Could you please return NULL explicitly?

I'll change it.

Thanks for you comments.

-- 
 i.