linux-kernel - Re: Spinlock debugging

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Message-ID: <87ac55yzx3.fsf@javad.com>
Date:	Tue, 12 Sep 2006 17:31:20 +0400
From:	Sergei Organov <osv@...ad.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Bird <ajb@...eresystems.co.uk>, linux-kernel@...r.kernel.org
Subject: Re: Spinlock debugging

Alan Cox <alan@...rguk.ukuu.org.uk> writes:
[...]
> So all you need in your IRQ handler is
>
> 	if (tty_insert_flip_string(tty, buf, size))
> 		tty_flip_buffer_push(tty);

What is the purpose of the "if" in the above code?  is push with no data
in the buffer dangerous? Or is it just optimization of
almost-never-taken path? ;)

-- Sergei.
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