kernel - Fix serious bug in MAP_STACK, deprecate auto-grow semantics
* When MAP_STACK is used without MAP_TRYFIXED, the address the kernel
determines for the stack was *NOT* being returned to userland. Instead,
userland always got only the hint address.
* This fixes ruby MAP_STACK use cases and possibly more.
* Deprecate MAP_STACK auto-grow semantics. All user mmap() calls with
MAP_STACK are now converted to normal MAP_ANON mmaps. The kernel will
continue to create an auto-grow stack segment for the primary user stack
in exec(), allowing older pthread libraries to continue working, but this
feature is deprecated and will be removed in a future release.
sephe's projects / dragonfly.git / commit