Re: [PATCH v14 5/8] arm64: mte: Enable TCO in functions that can read beyond buffer limits

[Vincenzo Frascino]

On 3/8/21 6:09 PM, Mark Rutland wrote:
>> +DECLARE_STATIC_KEY_FALSE(mte_async_mode);
> Can we please hide this behind something like:
> 
> static inline bool system_uses_mte_async_mode(void)
> {
> 	return IS_ENABLED(CONFIG_KASAN_HW_TAGS) &&
> 		static_branch_unlikely(&mte_async_mode);
> }
> 
> ... like we do for system_uses_ttbr0_pan()?
>

I agree, it is a cleaner solution. I will add it to v15.

> That way the callers are easier to read, and kernels built without
> CONFIG_KASAN_HW_TAGS don't have the static branch at all. I reckon you
> can put that in one of hte mte headers and include it where needed.

-- 
Regards,
Vincenzo