[PATCH v3 2/6] x86/uaccess: Avoid barrier_nospec() in 64-bit __get_user()

[Christophe Leroy]

Le 22/11/2024 à 04:57, Linus Torvalds a écrit :
> 
> I'm not loving the "if (0)" with the labels inside of it. But it's the
> only way I can see to make a statement expression like this work,
> since you can't have a "return"  inside of it.
> 

On powerpc for this kind of stuff I have been using do { } while (0); 
with a break; in the middle, see for instance __put_user() or 
__get_user_size_allowed() in arch/powerpc/include/asm/uaccess.h

Christophe