[Bug libc/16418] [powerpc] ppc's get_clockfreq is racy and cancel-unsafe

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https://sourceware.org/bugzilla/show_bug.cgi?id=16418

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6b2ba95b6baab6b1789e8823c8a808e09bc98794

commit 6b2ba95b6baab6b1789e8823c8a808e09bc98794
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Mon Nov 24 16:18:26 2014 -0500

    BZ #16418: Fix powerpc get_clockfreq raciness

    This patch fix powerpc __get_clockfreq racy and cancel-safe issues by
    dropping internal static cache and by using nocancel file operations.
    The vDSO failure check is also removed, since kernel code does not
    return an error (it cleans cr0.so bit on function return) and the static
    code (to read value /proc) now uses non-cancellable calls.

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

Summary of changes:
 ChangeLog                                       |    6 +
 NEWS                                            |   18 ++--
 sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c |  128 +++++++++++------------
 3 files changed, 74 insertions(+), 78 deletions(-)

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