tree c035a8d2357ee4c54b584a3ba4153d4673fa057f
parent 07d0408120216b60625c9a5b8012d1c3a907984d
author Vasily Gorbik <gor@linux.ibm.com> 1533561466 +0200
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1534387118 -0400

tracing: Add -mcount-nop option support

-mcount-nop gcc option generates the calls to the profiling functions
as nops which allows to avoid patching mcount jump with NOP instructions
initially.

-mcount-nop gcc option will be activated if platform selects
HAVE_NOP_MCOUNT and gcc actually supports it.
In addition to that CC_USING_NOP_MCOUNT is defined and could be used by
architectures to adapt ftrace patching behavior.

Link: http://lkml.kernel.org/r/patch-3.thread-aa7b8d.git-e02ed2dc082b.your-ad-here.call-01533557518-ext-9465@work.hours

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>