OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_76-4458-ga9a3cb2

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit a9a3cb2efff7e6c020be4687b004d157bc070ac6
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Wed Nov 5 10:22:00 2014 -0600

    LINUX: Avoid check for key_type.match existence
    
    Commit b5de4a9f removed our key_type 'match' function for kernels that
    do not have such a 'match' function pointer. However, this added a
    configure test where we are supposed to fail for the "new" behavior,
    which is discouraged.
    
    This causes an actual problem, because this test will fail on at least
    RHEL5, due to arguably unrelated reasons (the header file for the
    relevant struct is in key.h instead of key-type.h). And so, in that
    situation we avoid defining a 'match' function callback, meaning our
    'match' function callback is NULL, which causes a panic when we try to
    actually look up keys for a PAG.
    
    To fix this, transform the 'match' config test into one where we
    succeed for the "new" behavior. We do this by testing for the
    existence of the new functionality that replaced the old 'match'
    function, which is the match_preparse function (specifically, the
    'cmp' field in the structure accepted by match_preparse). This should
    cause unrelated compilation errors to cause us to revert to the "old"
    behavior instead of the "new" behavior. At worst, this should cause
    build issues if we get the config test wrong (since we will try to use
    the 'match' function definition that does not exist), instead of
    panicing at runtime.
    
    Note that while we test for key_type.match_preparse, we don't actually
    use that function, since our 'match' functionality is the same as the
    default behavior (according to b5de4a9f). So, we can avoid defining
    any such function for newer kernels.
    
    Thanks to Stephan Wiesand for bisecting this issue.
    
    Change-Id: If6f93d6b5340fa738a55adeb7778d26ff5dbacc1
    Reviewed-on: http://gerrit.openafs.org/11589
    Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
    Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>

 acinclude.m4               |    2 +-
 src/afs/LINUX/osi_groups.c |   10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

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