[Bug nptl/20822] race condition in __lll_unlock_elision on powerpc

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https://sourceware.org/bugzilla/show_bug.cgi?id=20822

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e9a96ea1aca4ebaa7c86e8b83b766f118d689d0f

commit e9a96ea1aca4ebaa7c86e8b83b766f118d689d0f
Author: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Date:   Tue Jan 3 17:16:02 2017 -0200

    powerpc: Fix write-after-destroy in lock elision [BZ #20822]

    The update of *adapt_count after the release of the lock causes a race
    condition when thread A unlocks, thread B continues and destroys the
    mutex, and thread A writes to *adapt_count.

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

Summary of changes:
 ChangeLog                                         |   13 +++++++++++++
 sysdeps/unix/sysv/linux/powerpc/elision-lock.c    |   10 +++++++---
 sysdeps/unix/sysv/linux/powerpc/elision-trylock.c |    7 ++++---
 sysdeps/unix/sysv/linux/powerpc/elision-unlock.c  |   15 +++++++++------
 4 files changed, 33 insertions(+), 12 deletions(-)

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