OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_74_1-141-g5219a6b

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 5219a6b33b8ea7a793d5b0797026abd7b187f85e
Author: Simon Wilkinson <sxw@inf.ed.ac.uk>
Date:   Thu May 20 11:57:20 2010 +0100

    Linux: Disable syscall probes if we have keyrings
    
    If we are building for are kernel with keyrings, and we can
    guarantee that we can make use of those keyrings, then we no longer
    need to probe for the syscall table at all. Change our default
    behaviour so that when these two conditions are true, syscall probing
    is disabled. Both --enable-linux-syscall-probing and
    --disable-linux-syscall-probing can be used to override the
    autodetection and force things one way or the other.
    
    We have to check that we can use the keyrings because there was a
    window in the 2.6 kernel series where keryings were available, but
    the key_type_keyring definiton (which we use to create the session
    keyring) wasn't exported. In that situation, we attempt to traverse
    the process table and use the type of init's session keyring. This
    traversal is fragile, and if it fails, keyring PAGs will be disabled.
    So, we still want to be able to fall back to patching the syscall
    table, if we can, in this case.
    
    FIXES 125215
    
    Change-Id: I11ba5c68fe37609bbd6b9c9f7e7c699334f42ebc
    Reviewed-on: http://gerrit.openafs.org/2002
    Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
    Reviewed-by: Derrick Brashear <shadow@dementia.org>
    Reviewed-by: Russ Allbery <rra@stanford.edu>
    Tested-by: Russ Allbery <rra@stanford.edu>

 acinclude.m4                |   40 ++++++++++++++++++++++++++++++++--------
 src/afs/LINUX/osi_probe.c   |    2 +-
 src/afs/LINUX24/osi_probe.c |    2 +-
 3 files changed, 34 insertions(+), 10 deletions(-)

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