[v6,00/17] Add static_call
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Message ID 20200710133831.943894387@infradead.org
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  • Add static_call
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Peter Zijlstra July 10, 2020, 1:38 p.m. UTC
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: linus + tip/objtool/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:

 - rebased
 - fixed ftrace synthetic events (rostedt)