Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault

[Al Viro]

On Sat, Aug 20, 2016 at 06:09:15PM -0700, H. Peter Anvin wrote:

> >Sorry for the bogus noise. I don't know why I was so convinced setjmp
> >needed special gcc semantics.
> >
> >             Linus
> 
> I think the specific name setjmp() is magic in gcc.

It is; attribute equivalent is returns_twice.  I wonder if "explicitly
clobber everything if we got false" + asm volatile to prevent reordering
would suffice for our purposes, but that's really a question for gcc
folks...