On Sun, Jul 13, 2014 at 1:01 PM, Andy Lutomirski [off-list ref] wrote:

The core mm code will provide a default gate area based on
FIXADDR_USER_START and FIXADDR_USER_END if
!defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR).

This default is only useful for ia64.  arm64, ppc, s390, sh, tile,
64-bit UML, and x86_32 have their own code just to disable it.  arm,
32-bit UML, and x86_64 have gate areas, but they have their own
implementations.

This gets rid of the default and moves the code into ia64.

This should save some code on architectures without a gate area: it's
now possible to inline the gate_area functions in the default case.

Can one of you pull this somewhere?  Otherwise I can put it somewhere
stable and ask for -next inclusion, but that seems like overkill for a
single patch.

--Andy