Re: [PATCH v3 0/6] Static calls

[Peter Zijlstra]

On Wed, Jan 09, 2019 at 04:59:35PM -0600, Josh Poimboeuf wrote:
> With this version, I stopped trying to use text_poke_bp(), and instead
> went with a different approach: if the call site destination doesn't
> cross a cacheline boundary, just do an atomic write.  Otherwise, keep
> using the trampoline indefinitely.

> - Get rid of the use of text_poke_bp(), in favor of atomic writes.
>   Out-of-line calls will be promoted to inline only if the call sites
>   don't cross cache line boundaries. [Linus/Andy]

Can we perserve why text_poke_bp() didn't work? I seem to have forgotten
again. The problem was poking the return address onto the stack from the
int3 handler, or something along those lines?