Re: [patch 0/4] uaccess: Provide and use helpers for user masked access

[Matthew Wilcox]

On Mon, Aug 18, 2025 at 02:36:31PM -0700, Linus Torvalds wrote:
> I realize some people have grown up being told that "goto is bad". Or
> have been told that exception handling should be baked into the
> language and be asynchronous. Both of those ideas are complete and
> utter garbage, and the result of minds that cannot comprehend reality.
> 
> Asynchronous exceptions are horrific and tend to cause huge
> performance problems (think setjmp()). The Linux kernel exception
> model with explicit exception points is not only "that's how you have
> to do it in C", it's also technically superior.
> 
> And "goto" is fine, as long as you have legible syntax and don't use
> it to generate spaghetti code. Being able to write bad code with goto
> doesn't make 'goto' bad - you can write bad code with *anything*.

Even Dijkstra doesn't argue against using goto for exception handling,

"I remember having read the explicit recommendation to restrict the use
of the go to statement to alarm exits, but I have not been able to trace
it; presumably, it has been made by C.A.R. Hoare."

https://www.cs.utexas.edu/~EWD/transcriptions/EWD02xx/EWD215.html