Re: [2/3] mm: fix up some user-visible effects of the stack guard page

[Linus Torvalds]

On Fri, Aug 20, 2010 at 2:17 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Appended is that much smaller patch.

Note that the "real" patch is actually even smaller than implied by
this thing. The diffstat

 include/linux/mm_types.h |    2 +-
 kernel/fork.c            |    7 +++++--
 mm/mmap.c                |   37 +++++++++++++++++++++++++++++++++----
 mm/nommu.c               |    7 +++++--
 4 files changed, 44 insertions(+), 9 deletions(-)

implies that it adds a lot more than it removes, but of the 35 new
lines it adds, about half of it - 16 lines - is just the vma list
verification hack. So it really adds less than 20 lines of code.
Hopefully those 20 lines would then buy themselves back with cleanups.

Still. A doubly-linked list is totally trivial, and I just bet I have
a bug in there somewhere. But looking at your 2007 patch and mine
side-by-side, I do think mine is still less scary.

                     Linus
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