Re: Floating point in kernel

From: Alan Cox (
Date: Wed May 03 2000 - 12:27:36 EST

> unsigned long foo = some_other_ulong * 1.234;
> This code has apparently been working for some time. According to C rules
> of type promotion, "some_other_ulong" should be promoted to a double to
> store the result of the expression, before discarding the fraction and
> assigning to foo.
> My question is, what are the likely problems to expect from this when
> running in kernel-space (on x86 w/FPU)?

Random floating point corruption on applications calling it. If its in an
IRQ random FPU corruption for all processes

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