netdev - Re: [PATCH] [v2] test_rhashtable: remove semaphore usage

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Date:   Mon, 17 Dec 2018 22:25:04 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     netdev@...r.kernel.org, "Acked-by : Phil Sutter" <phil@....cc>,
        Thomas Graf <tgraf@...g.ch>,
        "David S. Miller" <davem@...emloft.net>,
        NeilBrown <neilb@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] test_rhashtable: remove semaphore usage

On Sun, Dec 16, 2018 at 08:48:21PM +0100, Arnd Bergmann wrote:
> This is one of only two files that initialize a semaphore to a negative
> value. We don't really need the two semaphores here at all, but can do
> the same thing in more conventional and more effient way, by using a
> single waitqueue and an atomic thread counter.
> 
> This gets us a little bit closer to eliminating classic semaphores from
> the kernel. It also fixes a corner case where we fail to continue after
> one of the threads fails to start up.
> 
> An alternative would be to use a split kthread_create()+wake_up_process()
> and completely eliminate the separate synchronization.
> 
> Acked-by: Phil Sutter <phil@....cc>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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