linux-kernel - Re: use of preempt_count instead of in

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Message-ID: <47E4EDB5.2080205@s5r6.in-berlin.de>
Date:	Sat, 22 Mar 2008 12:29:57 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org
CC:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <david-b@...bell.net>,
	Richard Purdie <rpurdie@...ys.net>,
	Ingo Molnar <mingo@...e.hu>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	netdev@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-usb@...r.kernel.org, linux-wireless@...r.kernel.org,
	video4linux-list@...hat.com, lm-sensors@...sensors.org
Subject: Re: use of preempt_count instead of in_atomic() at leds-gpio.c

I wrote:
>>> and eth1394 to deal with temporary lack of of tlabels.  Alas I just  
>>> recently received a report that eth1394's workaround is unsuccessful 
>>> on  non-preemptible uniprocessor kernels.  
> (I haven't started working on a fix, or opened a bugzilla 
> ticket for it yet.  The reporter currently switched his kernel to 
> PREEMPT which is not affected.)

now logged as http://bugzilla.kernel.org/show_bug.cgi?id=10306

> The failure in the workaround is *not* about the in_atomic() being the 
> wrong question asked in hpsb_get_tlabel() --- no, ieee1394's in_atomic() 
> abuse works just fine even on UP PREEMPT_NONE.  Instead, the failure is 
> about kthreads not being scheduled in the way that I thought they would.
-- 
Stefan Richter
-=====-==--- --== =-==-
http://arcgraph.de/sr/
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