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From: Thomas Gleixner <tglx@linutronix.de>
To: Mason <slash.tmp@free.fr>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Semaphore API] down_interruptible_timeout
Date: Mon, 15 Jun 2015 18:56:29 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1506151855160.4120@nanos> (raw)
In-Reply-To: <557E9030.6080901@free.fr>

[-- Attachment #1: Type: TEXT/PLAIN, Size: 727 bytes --]

On Mon, 15 Jun 2015, Mason wrote:
> A) process-context kernel thread fills a FIFO and calls down(&fifo_empty);
> B) ISR handles the FIFO-empty interrupt with up(&fifo_empty);
> 
> However, in case something goes wrong and the interrupt never fires,
> I don't want the process to be stuck in an uninterruptible sleep.
> 
> Perhaps I can set a tiny timeout (e.g. 10 µs) and not worry about
> the interruptible part for such a small duration? (Hmm, __down_common
> calls schedule_timeout, which is jiffies-based. I don't think there
> is a hrtimers flavor. So µs timeouts would be off the table?)
> 
> Or I could use the interruptible version, and let the user kill the
> operation if necessary.

Use a completion.

Thanks,

	tglx

  reply	other threads:[~2015-06-15 16:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-15  8:43 Mason
2015-06-15 16:56 ` Thomas Gleixner [this message]
2015-06-16 15:43   ` Mason

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