Have you tried this out? - if it works, what I'm about to say is
complete bull ;)
> case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
You're not passing an integer 1 here. You're passing a symbol(string)
called 1 which using #size is turned into this
"call __put_user_" "1"
> __get_user_x(sizeof (*(ptr)),__ret_gu,__val_gu,ptr); \
Here you're trying to do the same with a compiletime/runtime function
integer result. It's just not going to work the same way.
I don't have time to check this out - its just a hunch.
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