linux-kernel - Re: Floating point usage inside kernel

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Message-ID: <4ECF8528.9080800@gmail.com>
Date:	Fri, 25 Nov 2011 13:08:08 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Nuno Santos <nsantos@...gma.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Floating point usage inside kernel

On 11/25/2011 12:14 PM, Nuno Santos wrote:
> Doing a grep -r kernel_fpu_begin * on kernel source dir I can find
> several references to this functions but not them is included in the
> include dir. Which include do I need to have this functions found in
> compile time?

It is defined in arch specific includes. For x86 in asm/i387.h (in
arch/x86/include).

> Am I even sailing in the right direction?

You should generally not use that anyway. It's not portable and disables
preemption.

Can't you do the computations in userspace? And why it cannot be
switched to integer types -- what algorithm is that? Some math function?

reagards,
-- 
js
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