linux-kernel - Re: [PATCH] rhashtable-test: extend to test concurrency

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Message-Id: <20150816214555.958D121475@mail.nwl.cc>
Date:	Sun, 16 Aug 2015 23:46:28 +0200
From:	Phil Sutter <phil@....cc>
To:	Florian Westphal <fw@...len.de>
Cc:	Thomas Graf <tgraf@...g.ch>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] rhashtable-test: extend to test concurrency

On Sun, Aug 16, 2015 at 08:12:35PM +0200, Florian Westphal wrote:
> Phil Sutter <phil@....cc> wrote:
> > After having tested insertion, lookup, table walk and removal, spawn a
> > number of threads running operations on the same rhashtable. Each of
> > them will:
> 
> [..]
> 
> > +	if (down_interruptible(&startup_sem))
> > +		pr_err("  thread[%d]: down_interruptible failed\n", tdata->id);
> 
> Why _interruptible?
> 
> Seems this should use down() instead.

According to the comment in kernel/locking/semaphore.c, down() is
deprecated and one should use down_interruptible() or down_killable()
instead. Apart from that, I don't see any problem with using down()
here. If the call fails, the code is pointless if not even broken
anyway.

Cheers, Phil
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