git: DragonFly_RELEASE_3_4 kernel - Fix TDF_NOFAULT issue related to vm.read_shortcut_enable.

[Matthew Dillon]

commit 14dbf99ccb6a16ed10ccc205e5b7d6527ec5400e
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu May 30 23:16:29 2013 -0700

    kernel - Fix TDF_NOFAULT issue related to vm.read_shortcut_enable.
    
    * TDF_NOFAULT was not preventing vm_fault() from calling vm_wait_pfault(),
      which could result in a deadlock in the read_shortcut path.  A combination
      of a low-memory situation plus the read_shortcut hitting the vm_fault
      sequence from uiomove_nofault().

Summary of changes:
 sys/vm/vm_fault.c | 49 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 16 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/14dbf99ccb6a16ed10ccc205e5b7d6527ec5400e


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