Messages in this thread | | | Date | Wed, 18 Nov 2015 07:55:08 +0100 | From | Ingo Molnar <> | Subject | Re: irq_fpu_usable() is irreliable |
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* Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> [...] Recently I've been tracking down a problem in which irq_fpu_usable() > returns false, yet a stack trace shows the first function is the syscall entry > point. [...]
Is this 'problem' a performance problem (code not being able to use the FPU occasionally and hence sporadically performing poorly), or some sort of actual stability/correctness problem?
Also, what CPU does the test system have, Intel or AMD? The FPU behavior can be very different in the two cases.
Third, could you post such a problematic stack trace?
Thanks,
Ingo
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