linux-kernel - Re: [PATCH 1/2] nfit: Use init_completion() in acpi_nfit_flush

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Date:   Thu, 24 Aug 2017 21:28:01 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, walken@...gle.com,
        Byungchul Park <byungchul.park@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>, willy@...radead.org,
        Nicholas Piggin <npiggin@...il.com>, kernel-team@....com,
        Dan Williams <dan.j.williams@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-nvdimm@...ts.01.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/2] nfit: Use init_completion() in
 acpi_nfit_flush_probe()

On Thu, Aug 24, 2017 at 03:07:42PM +0200, Thomas Gleixner wrote:
> On Wed, 23 Aug 2017, Boqun Feng wrote:
> 
> > There is no need to use COMPLETION_INITIALIZER_ONSTACK() in
> > acpi_nfit_flush_probe(), replace it with init_completion().
> 
> You completely fail to explain WHY.
> 

I thought COMPLETION_INITIALIZER_ONSTACK() should only use in assigment
or compound literals, so the usage here is obviously wrong, but seems
I was wrong?

Ingo,

Is the usage of COMPLETION_INITIALIZER_ONSTACK() correct? If not,
I could rephrase my commit log saying this is a fix for wrong usage of
COMPLETION_INITIALIZER_ONSTACK(), otherwise, I will rewrite the commit
indicating this patch is a necessary dependency for patch #2. Thanks!

Regards,
Boqun

> Thanks,
> 
> 	tglx
> 
>  
> > Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> > ---
> >  drivers/acpi/nfit/core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> > index 19182d091587..1893e416e7c0 100644
> > --- a/drivers/acpi/nfit/core.c
> > +++ b/drivers/acpi/nfit/core.c
> > @@ -2884,7 +2884,7 @@ static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
> >  	 * need to be interruptible while waiting.
> >  	 */
> >  	INIT_WORK_ONSTACK(&flush.work, flush_probe);
> > -	COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
> > +	init_completion(&flush.cmp);
> >  	queue_work(nfit_wq, &flush.work);
> >  	mutex_unlock(&acpi_desc->init_mutex);
> >  
> > -- 
> > 2.14.1
> > 
> > 

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