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From: Richard Weinberger <richard@nod.at>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Joel Fernandes <agnel.joel@gmail.com>,
	uml-devel <user-mode-linux-devel@lists.sourceforge.net>,
	Jeff Dike <jdike@addtoit.com>
Subject: Re: [uml-devel] UML hangs with hrtimer test module
Date: Wed, 28 Mar 2018 15:19:07 +0200	[thread overview]
Message-ID: <1847021.mDh9H4lbpW@blindfold> (raw)
In-Reply-To: <CAMuHMdU0jYx+NdZWdZpSwWZkBNvBDJ14trvM8B49h4st_7RkgA@mail.gmail.com>

Am Mittwoch, 28. März 2018, 15:11:29 CEST schrieb Geert Uytterhoeven:
> On Wed, Mar 28, 2018 at 12:28 PM, Joel Fernandes <agnel.joel@gmail.com> 
wrote:
> >         while(release_now == 0);
> 
> while (release_now == 0)
>         cpu_relax();

Not sure whether a cpu_relax() fixes the problem.
I guess the root of the problem is that UML is UP and non-preemptive. 
Therefore the loop is never interrupted.
To verify I asked for the full source.

Thanks,
//richard


  reply	other threads:[~2018-03-28 13:19 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-28 10:28 [uml-devel] UML hangs with hrtimer test module Joel Fernandes
2018-03-28 11:04 ` Richard Weinberger
2018-03-28 13:11 ` Geert Uytterhoeven
2018-03-28 13:19   ` Richard Weinberger [this message]
2018-03-28 22:19     ` Joel Fernandes
2018-03-28 22:35       ` Richard Weinberger
2018-03-29  6:04         ` Geert Uytterhoeven
2018-03-29 20:20           ` Joel Fernandes
2018-03-29 20:34             ` Richard Weinberger

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