Re: Floating point in kernel

From: Brian Gerst (
Date: Wed May 03 2000 - 12:31:22 EST

"B. James Phillippe" wrote:
> Hello,
> I know this is not legal. However, I'm reviewing some kernel module code
> which basically does:
> 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)?

If some_other_ulong is a constant, then the value is calculated at
compile time.


Brian Gerst

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