tree c7d7a187a2125518e655dfeadffd38156239ffc3
parent 05d3794aa8bd3b2c9f7920a05003c331cdeb75c5
author Linus Torvalds <torvalds@osdl.org> 1116455973 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1116513996 -0700

[PATCH] prevent NULL mmap in topdown model

Prevent the topdown allocator from allocating mmap areas all the way
down to address zero.

We still allow a MAP_FIXED mapping of page 0 (needed for various things,
ranging from Wine and DOSEMU to people who want to allow speculative
loads off a NULL pointer).

Tested by Chris Wright.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>