tracing: Add a helper function for event print functions
Move duplicate code in event print functions to a helper function. This shrinks the size of the kernel by ~13K. text data bss dec hex filename 6596137 1743966 10138672 18478775 119f6b7 vmlinux.o.old 6583002 1743849 10138672 18465523 119c2f3 vmlinux.o.new Link: http://lkml.kernel.org/r/51258746.2060304@huawei.comSigned-off-by: NLi Zefan <lizefan@huawei.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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