[PATCH 0/2] [SRU] [SAUCE] [MNO/ti-omap4 and L/fsl-imx51] large mmap() support

Paolo Pisati paolo.pisati at canonical.com
Fri Dec 2 16:30:32 UTC 2011

BugLink: http://bugs.launchpad.net/bugs/861296

SRU Justification:


Mmap() fails to allocate large chunks of contiguos memory due to limitations in the allocation strategy.


See mmap-test.c and mmap-test-slices.c attached to the LP bug.


The patches are not mainline yet but entered rmk patch system (and thus should be in the 3.3 merge window).

Natty and Oneiric applied as-is, while Maverick needed some mechanical modifications.
Lucid required some backporting (no address randomization there) and some helper functions.

Kernels with the aforementioned patches were tested and confirmed to fix the problem.

Rob Herring (2):
  use cache type functions for arch_get_unmapped_area
  topdown mmap support

 arch/arm/include/asm/pgtable.h   |    1 +
 arch/arm/include/asm/processor.h |    2 +
 arch/arm/mm/mmap.c               |  196 +++++++++++++++++++++++++++++++++----
 3 files changed, 177 insertions(+), 22 deletions(-)


More information about the kernel-team mailing list