[PATCH v5 00/17] Add static_call()
From: Peter Zijlstra
Date: Wed Jun 24 2020 - 11:52:40 EST
Hi all,
Hopefully for the last time...
static_call(), is the idea of static_branch() applied to indirect function
calls. Remove a data load (indirection) by modifying the text.
The inline implementation still relies on objtool to generate the
.static_call_sites section, mostly because this is a natural place for x86_64
and works for both GCC and LLVM. Other architectures can pick other means
if/when they implement the inline patching. The out-of-line (aka. trampoline)
variant doesn't require this.
Patches go on top of tip/objtool/core + tip/perf/core
Patches can also be found here:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/static_call
Changes since the last time:
- Better documentation
- More consistent macro names
- Changed key prefix
- Folded trampoline definitions
- Renamed DEFINE_STATIC_COND_CALL / DEFINE_STATIC_CALL_NULL