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From: Arnd Bergmann <arnd@arndb.de>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Michel Lespinasse <walken@google.com>,
	Byungchul Park <byungchul.park@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	willy@infradead.org, Nicholas Piggin <npiggin@gmail.com>,
	kernel-team@lge.com, Dan Williams <dan.j.williams@intel.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	linux-nvdimm@lists.01.org,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>
Subject: Re: [PATCH 1/2] nfit: Use init_completion() in acpi_nfit_flush_probe()
Date: Thu, 24 Aug 2017 15:46:26 +0200	[thread overview]
Message-ID: <CAK8P3a1bVCxJCi_84abo4Bk7LFr7ynO1=7bW5dm=jbLvH9sR2Q@mail.gmail.com> (raw)
In-Reply-To: <20170824132801.GM11771@tardis>

On Thu, Aug 24, 2017 at 3:28 PM, Boqun Feng <boqun.feng@gmail.com> wrote:
> 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!

I think your patch is correct, but your changelog text is useless, as
Thomas mentioned: you should instead explain that it breaks with the
other fix in the series, and what the difference between init_completion()
and COMPLETION_INITIALIZER_ONSTACK() is.

      Arnd

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  reply	other threads:[~2017-08-24 13:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-23 15:25 [PATCH 0/2] completion: Reduce stack usage caused by COMPLETION_INITIALIZER_ONSTACK() Boqun Feng
2017-08-23 15:25 ` [PATCH 1/2] nfit: Use init_completion() in acpi_nfit_flush_probe() Boqun Feng
2017-08-23 22:08   ` Dan Williams
2017-08-24 13:07   ` Thomas Gleixner
2017-08-24 13:28     ` Boqun Feng
2017-08-24 13:46       ` Arnd Bergmann [this message]
2017-08-24 14:22   ` [PATCH v2 1/2] nfit: Fix the abuse of COMPLETION_INITIALIZER_ONSTACK() Boqun Feng
2017-08-25  0:18     ` Boqun Feng
2017-08-25  0:36     ` Dan Williams
2017-08-23 15:25 ` [PATCH 2/2] completion: Avoid unnecessary stack allocation for COMPLETION_INITIALIZER_ONSTACK() Boqun Feng
2017-08-23 15:33 ` [PATCH 0/2] completion: Reduce stack usage caused by COMPLETION_INITIALIZER_ONSTACK() Arnd Bergmann

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