Re: [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS)

[Sami Tolvanen]

On Fri, Oct 25, 2019 at 9:22 AM Nick Desaulniers
<ndesaulniers@xxxxxxxxxx> wrote:
> > +static void scs_free(void *s)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < SCS_CACHE_SIZE; i++) {
> > +               if (this_cpu_cmpxchg(scs_cache[i], 0, s) != 0)
> > +                       continue;
> > +
> > +               return;
> > +       }
>
> prefer:
>
> for ...:
>   if foo() == 0:
>     return
>
> to:
>
> for ...:
>   if foo() != 0:
>     continue
>   return

This was essentially copied from free_thread_stack in kernel/fork.c,
but I agree, your way is cleaner. I'll change this in the next
version. Thanks!

Sami