On Fri, 5 Mar 2021, Huang Pei wrote:

/home/hp/projects/Linux/temp/linux-stable/arch/mips/include/asm/io.h: In function ‘phys_to_virt’:
/home/hp/projects/Linux/temp/linux-stable/arch/mips/include/asm/io.h:122:9: error: cast to pointer 
from integer of different size [-Werror=int-to-pointer-cast]
  return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);


.........

Only change CAC_BASE Does NOT work 

 Thank you for checking.

 Right.  I don't know why it fails for `phys_to_virt' where `address' is 
of the `unsigned long' type, but there are other places where the macros 
themselves are cast to `void *'.  We may want to rework that stuff, but 
not necessarily on this occasion.

 Use an explicit cast of the macro to `s64' here then, as my other 
suggestion was.  Anything is better than hardcoded magic numbers.

  Maciej