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Date: Mon, 26 Feb 2007 07:51:19 -0800 (PST) From: Linus Torvalds <torvalds@...ux-foundation.org> To: Jiri Slaby <jirislaby@...il.com> cc: Uwe Bugla <uwe.bugla@....de>, akpm@...ux-foundation.org, bunk@...sta.de, linux-kernel@...r.kernel.org, Stephane Eranian <eranian@....hp.com>, Andi Kleen <ak@...e.de> Subject: Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot be mounted without hanging up the whole system On Mon, 26 Feb 2007, Jiri Slaby wrote: > > Ok, this commit is the culprit: > Commit: 2ff2d3d74705d34ab71b21f54634fcf50d57bdd5 > Author: Stephane Eranian <eranian@....hp.com> Tue, 13 Feb 2007 13:26:22 +0100 > > [PATCH] i386: add idle notifier Interesting. It doesn't touch floppy at all, but it *does* seem to play around with irq state. In particular, the floppy uses IRQF_DISABLED (which means that it doesn't want interrupts enabled when in the irq handler), and I get the feeling that the poll_idle() stuff made that not work. That said, the only thing that *really* seems to change (as far as a floopy driver could notice) is the added "exit_idle()" in the do_IRQ() sequence, and I'm not seeing that one enabling interrupts. But the idle sequence definitely does (ie now we disable/enable interrupts in cpu_idle(). I'm not seeing why that should matter, though. Stephane, any ideas? Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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