Hi,
this is a resurrection of a few years old idea to have jump labels use
synchronization based on int3 breakpoint rather than relying on
stop_machine() with all the consequences.
ftrace has been doing exactly this kind of patching for year since
08d636b6 ("ftrace/x86: Have arch x86_64 use breakpoints instead of stop
machine").
This patchset first introduces generic text_poke_bp() that provides means
to perform this method of patching in parallel to text_poke_smp(), and
then converts x86 jump label code to use it.
If this is merged, I'll do a followup patch converting ftrace to use this
infrastructure as well, as it's doing the same thing in principle already.
Comments welcome.
--
Jiri Kosina
SUSE Labs
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