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    Subject[PATCH v2] perf tools: Work around lack of sched_getcpu in glibc < 2.6.
    Date
    From: Vinson Lee <vlee@twitter.com>

    This patch fixes this build error with glibc < 2.6.

    CC util/cloexec.o
    cc1: warnings being treated as errors
    util/cloexec.c: In function ‘perf_flag_probe’:
    util/cloexec.c:24: error: implicit declaration of function
    ‘sched_getcpu’
    util/cloexec.c:24: error: nested extern declaration of ‘sched_getcpu’
    make: *** [util/cloexec.o] Error 1

    Cc: stable@vger.kernel.org # 3.18+
    Signed-off-by: Vinson Lee <vlee@twitter.com>
    ---
    tools/perf/util/cloexec.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
    index 6da965b..285bd70 100644
    --- a/tools/perf/util/cloexec.c
    +++ b/tools/perf/util/cloexec.c
    @@ -7,6 +7,16 @@

    static unsigned long flag = PERF_FLAG_FD_CLOEXEC;

    +#ifdef __GLIBC_PREREQ
    +#if !__GLIBC_PREREQ(2, 6)
    +static int sched_getcpu(void)
    +{
    + errno = ENOSYS;
    + return -1;
    +}
    +#endif
    +#endif
    +
    static int perf_flag_probe(void)
    {
    /* use 'safest' configuration as used in perf_evsel__fallback() */
    --
    1.8.2.1


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