Re: [PATCH v7 03/14] x86/cet/ibt: Add IBT legacy code bitmap setup function

* Dave Hansen:

My assumption has always been that these large, potentially sparse
hardware tables *must* be mmap()'d with MAP_NORESERVE specified.  That
should keep them from being problematic with respect to overcommit.

MAP_NORESERVE pages still count towards the commit limit.  The flag only
disables checks at allocation time, for this particular allocation.  (At
least this was the behavior the last time I looked into this, I
believe.)

Not sure if this makes a difference here.

Thanks,
Florian