Re: [PATCH] ARM: support PREEMPT_DYNAMIC

[Jinjie Ruan]

On 2024/7/31 16:24, Russell King (Oracle) wrote:
> On Wed, Jul 31, 2024 at 10:07:53AM +0800, Jinjie Ruan wrote:
>>>  #ifdef CONFIG_PREEMPTION
>>> +#ifdef CONFIG_PREEMPT_DYNAMIC
>>> +	bl	need_irq_preemption
>>> +	cmp	r0, #0
>>> +	beq	2f
>>> +#endif
> 
> Depending on the interrupt rate, this can be regarded as a fast path,
> it would be nice if we could find a way to use static branches in
> assembly code.
It seems to be hard to use static keys in assembly code.

By the way, currently, most architectures have simplified assembly code
and implemented its most functions in C functions. Does arm32 have this
plan?

>