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Re: irq_fpu_usable() is irreliable

From "Jason A. Donenfeld" <Jason@zx2c4.com>
Newsgroups linux.kernel
Subject Re: irq_fpu_usable() is irreliable
Date 2015-11-18 21:00 +0100
Message-ID <qwh3z-7rl-3@gated-at.bofh.it> (permalink)
References <qvMMa-4qX-21@gated-at.bofh.it> <qw4SK-7Nb-3@gated-at.bofh.it> <qw9Sq-2Jt-11@gated-at.bofh.it>
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Hi Ingo,

The plot thickens, once again.

> > Also, what CPU does the test system have, Intel or AMD? The FPU behavior can be
> > very different in the two cases.
> Intel 3820QM, but inside VMWare Workstation 12.

Trying this on bare metal, the problem goes away! Though the VM is 4.2
and my bare metal is 4.3. Perhaps your recent changes did something.

But more likely, there's some funny business happening with VMWare.
Any speculation about this? Fascinating issue...

Jason
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Thread

irq_fpu_usable() is irreliable "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-11-17 12:40 +0100
  Re: irq_fpu_usable() is irreliable Ingo Molnar <mingo@kernel.org> - 2015-11-18 08:00 +0100
    Re: irq_fpu_usable() is irreliable "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-11-18 13:20 +0100
      Re: irq_fpu_usable() is irreliable "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-11-18 21:00 +0100
        Re: irq_fpu_usable() is irreliable Ingo Molnar <mingo@kernel.org> - 2015-11-27 09:50 +0100
      Re: irq_fpu_usable() is irreliable Ingo Molnar <mingo@kernel.org> - 2015-11-27 09:50 +0100

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