From: Tanya Brokhman <tlinder@codeaurora.org>
To: Richard Weinberger <richard@nod.at>,
"Bityutskiy, Artem" <artem.bityutskiy@intel.com>
Cc: "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dedekind1@gmail.com" <dedekind1@gmail.com>
Subject: Re: [PATCH 4/4] UBI: Fastmap: Ensure that only one fastmap work is scheduled
Date: Thu, 02 Oct 2014 17:22:41 +0300 [thread overview]
Message-ID: <542D5FB1.3090307@codeaurora.org> (raw)
In-Reply-To: <542A5F64.5000302@nod.at>
On 9/30/2014 10:44 AM, Richard Weinberger wrote:
> Am 30.09.2014 09:39, schrieb Bityutskiy, Artem:
>> On Tue, 2014-09-30 at 08:59 +0200, Richard Weinberger wrote:
>>> Am 30.09.2014 08:45, schrieb Bityutskiy, Artem:
>>>> On Tue, 2014-09-30 at 00:20 +0200, Richard Weinberger wrote:
>>>>> + spin_lock(&ubi->wl_lock);
>>>>> + ubi->fm_work_scheduled = 0;
>>>>> + spin_unlock(&ubi->wl_lock);
>>>>
>>>> Andrew Morton once said me that if I am protecting an integer change
>>>> like this with a spinlock, I have a problem in my locking design. He was
>>>> right for my particular case.
>>>>
>>>> Integer is changes atomic. The only other thing spinlock adds are the
>>>> barriers.
>>>
>>> I've added the spinlock to have a barrier in any case.
>>
>> Examples of any?
>
> You mean a case where the compiler would reorder code and the barrier is needed?
> I don't have one, but I'm not that creative as a modern C compiler.
> If you say that no barrier is needed I'll trust you. :-)
we just implemented the same thing :) It's being tested....
Why not use atomic_t fm_work_scheduled and save the spin_lock?
>
> Thanks,
> //richard
>
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>
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prev parent reply other threads:[~2014-10-02 14:22 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-29 22:20 UBI: Fastmap fixes - round one Richard Weinberger
2014-09-29 22:20 ` [PATCH 1/4] UBI: Ensure that all fastmap work is done upon WL shutdown Richard Weinberger
2014-09-30 6:26 ` Artem Bityutskiy
2014-09-30 6:58 ` Richard Weinberger
2014-09-30 7:53 ` Bityutskiy, Artem
2014-09-30 8:07 ` Richard Weinberger
2014-10-03 12:52 ` Artem Bityutskiy
2014-10-02 13:05 ` Tanya Brokhman
2014-10-02 13:18 ` Richard Weinberger
2014-09-29 22:20 ` [PATCH 2/4] UBI: Fastmap: Calc fastmap size correctly Richard Weinberger
2014-10-02 13:14 ` Tanya Brokhman
2014-10-02 13:18 ` Richard Weinberger
2014-10-02 14:04 ` Tanya Brokhman
2014-10-03 14:38 ` Artem Bityutskiy
2014-09-29 22:20 ` [PATCH 3/4] UBI: Fastmap: Care about the protection queue Richard Weinberger
2014-10-02 13:28 ` Tanya Brokhman
2014-10-02 13:32 ` Richard Weinberger
2014-10-02 14:14 ` Tanya Brokhman
2014-10-03 14:31 ` Artem Bityutskiy
2014-10-03 19:06 ` Richard Weinberger
2014-10-13 13:17 ` Artem Bityutskiy
2014-10-13 14:30 ` Richard Weinberger
2014-10-13 15:23 ` Artem Bityutskiy
2014-10-13 15:28 ` Bityutskiy, Artem
2014-10-13 21:04 ` Richard Weinberger
2014-10-14 10:23 ` Artem Bityutskiy
2014-10-14 12:21 ` Tanya Brokhman
2014-10-14 13:02 ` Artem Bityutskiy
2014-10-14 13:35 ` Tanya Brokhman
2014-10-16 10:06 ` Richard Weinberger
2014-10-16 10:15 ` Artem Bityutskiy
2014-10-16 11:07 ` Richard Weinberger
2014-10-20 14:46 ` Artem Bityutskiy
2014-10-20 15:17 ` Richard Weinberger
2014-10-20 15:40 ` Artem Bityutskiy
2014-10-20 15:59 ` Richard Weinberger
2014-10-20 16:09 ` Artem Bityutskiy
2014-10-20 16:17 ` Richard Weinberger
2014-10-20 20:46 ` Richard Weinberger
2014-09-29 22:20 ` [PATCH 4/4] UBI: Fastmap: Ensure that only one fastmap work is scheduled Richard Weinberger
2014-09-30 6:45 ` Bityutskiy, Artem
2014-09-30 6:59 ` Richard Weinberger
2014-09-30 7:39 ` Bityutskiy, Artem
2014-09-30 7:44 ` Richard Weinberger
2014-10-02 14:22 ` Tanya Brokhman [this message]
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