[ufo]

Some explanation from Linus about how this trick works: https://lkml.org/lkml/2018/3/20/845

[120bits]

"sizeof((void )1)"

"- this will break the minds of everybody who ever sees that expression."

It indeed broke my mind!

[Koshkin]

I am sure you meant

  sizeof((void*)1)

[alblue]

Given the italics, it wouldn’t surprise me if the original was in fact:

sizeof(*(void*)1)