Re: [PATCH] x86/fpu: Remove the _GPL from the kernel_fpu_begin/end() export

From: Rik van Riel
Date: Sun May 05 2019 - 12:06:17 EST

On Sat, 2019-05-04 at 04:28 +0200, Sebastian Gottschall wrote:

> Using fpu code in kernel space in a kernel module is a derived work
> of
> the kernel itself?
> dont get me wrong, but this is absurd. i mean you limit the use of
> cpu
> instructions. the use
> of cpu instructions should be free of any licensing issue. i would
> even
> argument you are violating
> the license of the cpu ower given to the kernel by executing it, by
> restricting its use for no reason

Using FPU code in kernel space in a kernel module
does not require the use of kernel_fpu_begin/end().

The kernel module could simply disable preemption,
save the FPU registers, use the FPU, restore the
FPU registers, and reenable preemption.

However, using kernel_fpu_begin/end() does get that
module some nice optimizations that are specific to

All Rights Reversed.

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