Re: [PATCH 3/3] x86, fpu: don't abuse FPU in kernel threads if use_eager_fpu()

Borislav Petkov
2015-02-23T17:08:05Z

On Mon, Jan 19, 2015 at 07:52:12PM +0100, Oleg Nesterov wrote:
> Afaics there is no reason why kernel threads should have FPU context
> even if use_eager_fpu() == T. Now that interrupted_kernel_fpu_idle()
> does not check __thread_has_fpu() we can remove the init_fpu() code
^
... in the use_eager_fpu() case...

I added it to the commit message.

> from eager_fpu_init() and change flush_thread() called by do_execve()
> to initialize FPU.
>
> Note: of course, the change in flush_thread() is horrible and must be
> cleanuped. We need the new helper, and flush_thread() should return the
> error if init_fpu() fails.
>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Applied, thanks.

--
Regards/Gruss,
Boris.

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