Selecting per process flags

Hello,

I've recently read a discussion about a patch made to the kernel back
in 2005.  It was about linux's stack and mmap randomization. A
particular patch caught my attention. At patch 3/6 (PF_RANDOMIZE - per
process flag to enable/disable), Arjan says:

    ``Even thoguh there is a global flag to disable randomisation,
    it's useful to have a per process flag too; the patch below
    introduces this per process flag and automatically sets it for
    "new" binaries. ''

The whole thread can be found at: http://tinyurl.com/3282k9 [lkml @
google groups]

I couldn't find a way to set those per process flags. I looked for it
on google but I couldn't find how I change those per process flags. I
couldn't find the available flags anywhere either (there's a bunch of
PF_* on /usr/src/linux/include/linux/sched.h, I suppose those are the
flags). Am I being really stupid here?