xor as a lazy comparison

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Hi list,

I have seen this in kernel/signal.c:check_kill_permission()

            && (current->euid ^ t->suid) && (current->euid ^ t->uid)

If current->euid and t->suid are the same, the xor returns 0, so these 
statements are effectively the same as a !=

	current->euid != t->suid ...

Why ^ ?

Jan Engelhardt
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