x86: add reenter_kprobe helper
[ mhiramat@redhat.com: updated it to latest x86.git ] Factor common X86_32, X86_64 kprobe reenter logic from deeply indented section to helper function. Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com>
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