Ahh yes.  However currently enabling the stack protector occurs on all
functions which may have performance ramifications:

  config CC_STACKPROTECTOR_ALL
        bool

  config CC_STACKPROTECTOR
        bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
        select CC_STACKPROTECTOR_ALL
        ---help---

-- 
enable kernel stack protection
https://bugs.launchpad.net/bugs/369152
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