linux-kernel - Re: yield() in i2c non-happy paths hits BUG under -rt patch

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Date:	Thu, 19 Nov 2009 12:59:06 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Leon Woestenberg <leon.woestenberg@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	linux-i2c@...r.kernel.org,
	rt-users <linux-rt-users@...r.kernel.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: yield() in i2c non-happy paths hits BUG under -rt patch

> Well, I guess only people monitoring system latency would notice, as
> this is the only thing yield() was supposed to help with in the first
> place.

	if (need_resched())
		schedule();

will make non-rt tasks act politely at the right moments. RT tasks will
likely immediately get to take the CPU again depending upon the
scheduling parameters in use.
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