OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_72-100-gb7b0b4d

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit b7b0b4dea74e829ce0e36edd87a881a6f11df472
Author: Simon Wilkinson <sxw@inf.ed.ac.uk>
Date:   Sat Mar 6 11:21:06 2010 +0000

    Linux: Fix builds on RHEL4
    
    RHEL4 has a very old 2.6 kernel (2.6.9), which predates the start of
    the Linux git tree. When I started using page_offset, I mistakenly assumed
    that everything in the initial commit to that tree was available in all
    2.6 versions we care about. That isn't the case, sadly.
    
    Secondly, the new readpage code uses zero_user_segments, which has only
    been available in the mainline kernel since 2.6.25 (RHEL5 appears to have
    a backport)
    
    Implement local wrappers for both of these functions when configure can't
    find them in the kernel we're building for.
    
    These functions have been created independently of the Linux tree.
    page_offset is a copy of the code we used before we replaced it.
    zero_user_segments() is a first-principles implementation
    of the function (which zeros a pair of memory ranges within a single page)
    
    FIXES 126678
    
    Change-Id: I622aec4d653567d5234e7a127b981e97468bbe7c
    Reviewed-on: http://gerrit.openafs.org/1525
    Reviewed-by: Derrick Brashear <shadow@dementia.org>
    Tested-by: Derrick Brashear <shadow@dementia.org>

 acinclude.m4               |    2 ++
 src/afs/LINUX/osi_compat.h |   27 +++++++++++++++++++++++++++
 src/cf/linux-test4.m4      |   26 ++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 0 deletions(-)

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