>> This looks correct now. A few more points though:
>> 
>> * My first thought would have been to do this by first defining the
>>   two symbols before the #include, and then adding an #ifdef in
>>   the generic file. Both approaches work though, any other opinions
>>   on this?

>That's what I was thinking as well. Maybe with a single #ifndef
>MINSIGSTKSZ to cover both macros.

I am sharing another patch which adds both macro in arm64/.../signal.h with new values and put a check with #ifndef in uapi/.../signal.h.
       
  
         
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