Re: [patch 05/12] x86/irq: Provide macro for inlining irq stack switching

Josh Poimboeuf
2021-02-08T21:33:33Z

On Thu, Feb 04, 2021 at 09:49:08PM +0100, Thomas Gleixner wrote:
> #ifdef CONFIG_X86_64
> +
> +#ifdef CONFIG_UNWINDER_FRAME_POINTER
> +# define IRQSTACK_CALL_CONSTRAINT , ASM_CALL_CONSTRAINT
> +#else
> +# define IRQSTACK_CALL_CONSTRAINT
> +#endif

Is this really needed? i.e. does ASM_CALL_CONSTRAINT actually affect
code generation with !FRAME_POINTER?

If so then we should rework ASM_CALL_CONSTRAINT itself to be something
similar to the above, as it's only ever needed with frame pointers.

--
Josh