kprobes/x86-64: Allow to reenter probe on post_handler
kprobes/x86-64: Allow to reenter probe on post_handler

Allow to reenter probe on the post_handler of another probe on x86-64,
because x86-64 already allows reentering int3.
In that case, reentered probe just increases kp.nmissed and returns.

Signed-off-by: Masami Hiramatsu <308c3db2ad395e67f502db11a9ceb1603d4442e0@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <7dc108d19a2513f6455353af182b9e4d3b794ec9@in.ibm.com>
Cc: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>
LKML-Reference: <2fbea18f8dfc1a1072462c5d0e699bf924e294ee@localhost.localdomain>
Signed-off-by: Frederic Weisbecker <e8a1bf9163cb25e93cfd6540f223b3872ea7ee55@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas