[Bug libc/9894] Support for PI futexes wrongly marked as introduced in 2.6.18

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=9894

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d0f5b3f851cfced84e3228977eb8dfdc9c607231

commit d0f5b3f851cfced84e3228977eb8dfdc9c607231
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Apr 30 15:39:30 2014 +0000

    Increase minimum Linux kernel version to 2.6.32.

    This patch increases the minimum Linux kernel version for glibc to
    2.6.32, as discussed in the thread starting at
    <https://sourceware.org/ml/libc-alpha/2014-01/msg00511.html>.

    This patch just does the minimal change to arch_minimum_kernel
    settings (and LIBC_LINUX_VERSION, which determines the minimum kernel
    headers version, as it doesn't make sense for that to be older than
    the minimum kernel that can be used at runtime).  Followups would be
    expected to do, roughly and not necessarily precisely in this order:

    * Remove __LINUX_KERNEL_VERSION checks in kernel-features.h files
      where those checks are always true / always false for kernels 2.6.32
      and above.

    * Otherwise simplify/improve conditionals in those files (for example,
      where defining once in the main file then undefining in
      architecture-specific files makes things clearer than having lots of
      separate definitions of the same macro), possibly fixing in the
      process cases where a macro should optimally have been defined for a
      given architecture but wasn't.  (In the review in preparation for
      this version increase I checked what the right conditions should be
      for all macros in the main kernel-features.h whose definitions there
      would have been affected by the increase - but I only fixed that
      subset of the issues found where --enable-kernel=2.6.32 would have
      caused a kernel feature to be wrongly assumed to be present, not any
      cases where a feature is not assumed but could be assumed.)

    * Remove conditionals on __ASSUME_* where they can now be taken to be
      always-true, and the definitions when the macros are only used in
      Linux-specific files.

    * Split more architectures out of the main kernel-features.h (like
      ex-ports architectures), once various of the architecture
      conditionals there have been eliminated so the new
      architecture-specific files are no larger than actually necessary.

    Tested x86_64.

    2014-03-27  Joseph Myers  <joseph@codesourcery.com>

        [BZ #9894]
        * sysdeps/unix/sysv/linux/configure.ac (LIBC_LINUX_VERSION):
        Change to 2.6.32.
        (arch_minimum_kernel): Change all 2.6.16 settings to 2.6.32.
        * sysdeps/unix/sysv/linux/configure: Regenerated.
        * sysdeps/unix/sysv/linux/microblaze/configure.ac: Remove file.
        * sysdeps/unix/sysv/linux/microblaze/configure: Likewise.
        * sysdeps/unix/sysv/linux/tile/configure.ac: Likewise.
        * sysdeps/unix/sysv/linux/tile/configure: Likewise.
        * README: Update reference to required Linux kernel version.
        * manual/install.texi (Linux): Update reference to required Linux
        kernel headers version.
        * INSTALL: Regenerated.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                       |   14 +++++++++
 INSTALL                                         |    2 +-
 NEWS                                            |    5 +++-
 README                                          |    2 +-
 manual/install.texi                             |    2 +-
 sysdeps/unix/sysv/linux/configure               |   34 +++++++++++-----------
 sysdeps/unix/sysv/linux/configure.ac            |   18 ++++++------
 sysdeps/unix/sysv/linux/microblaze/configure    |    4 ---
 sysdeps/unix/sysv/linux/microblaze/configure.ac |    4 ---
 sysdeps/unix/sysv/linux/tile/configure          |    4 ---
 sysdeps/unix/sysv/linux/tile/configure.ac       |    4 ---
 11 files changed, 47 insertions(+), 46 deletions(-)
 delete mode 100644 sysdeps/unix/sysv/linux/microblaze/configure
 delete mode 100644 sysdeps/unix/sysv/linux/microblaze/configure.ac
 delete mode 100644 sysdeps/unix/sysv/linux/tile/configure
 delete mode 100644 sysdeps/unix/sysv/linux/tile/configure.ac

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