Hi David,
On Mon, Nov 16, 2015 at 9:32 PM, David Miller <[email protected]> wrote:
> Network device driver transmit executes with software interrupts
> disabled.
>
> Therefore on x86, you cannot use the FPU.
That is extremely problematic for me. Is there a way to make this not
so? A driver flag that would allow this?
Also - how come it irq_fpu_usable() is true when using TCP but not
when using UDP?
Further, irq_fpu_usable() doesn't only check for interrupts. There are
two other conditions that allow the FPU's usage, from
arch/x86/kernel/fpu/core.c:
bool irq_fpu_usable(void)
{
return !in_interrupt() ||
interrupted_user_mode() ||
interrupted_kernel_fpu_idle();
}
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