'can't generate tag __mrs_s from "#define __mrs_s(v, r)" in a file.. even using --excmd=pattern

generating tags using ctags seems to be very tricky.
I wanted make tag file for https://elixir.bootlin.com/linux/v5.4.21/source/arch/arm64/include/asm/sysreg.h
you can get this sysreg.h file by

wget https://elixir.bootlin.com/linux/v5.4.21/source/arch/arm64/include/asm/sysreg.h

Please see Can't add reg expression for a #define in ctags. I tried the same method in this answer as below.

ctags --excmd=pattern sysreg.h

I see tag for mrs_s or msr_s in the generated tags file. But I don't see the tag for __mrs_s or __msr_s that I originally wanted. What is wrong?

ctagsexuberant-ctags


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