Messages in this thread Patch in this message | | | From | Petr Holasek <> | Subject | [PATCH] perf tools: rework of handling lack of sched_getcpu in old glibc | Date | Tue, 19 May 2015 15:20:47 +0200 |
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Commit e1e455f4f4d3 ("perf tools: Work around lack of sched_getcpu in glibc < 2.6.") introduced weak function sched_getcpu() which should be overridden by sched_getcpu() provided by glibc >= 2.6. Unfortunately, the weak function was linked to sched_getcpu() used in perf bench numa and made the benchmark heavily relying on this function unusable.
This patch alternates weak function magic for preprocessor defines.
Signed-off-by: Petr Holasek <pholasek@redhat.com> --- tools/perf/util/cloexec.c | 13 +++++++++++-- tools/perf/util/cloexec.h | 6 ------ 2 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c index 85b5238..23b8aa9 100644 --- a/tools/perf/util/cloexec.c +++ b/tools/perf/util/cloexec.c @@ -7,11 +7,20 @@ static unsigned long flag = PERF_FLAG_FD_CLOEXEC; -int __weak sched_getcpu(void) +#ifdef __GLIBC_PREREQ +#if !__GLIBC_PREREQ(2, 6) +static int do_sched_getcpu(void) { errno = ENOSYS; return -1; } +#else +static int do_sched_getcpu(void) +{ + return sched_getcpu(); +} +#endif +#endif static int perf_flag_probe(void) { @@ -27,7 +36,7 @@ static int perf_flag_probe(void) pid_t pid = -1; char sbuf[STRERR_BUFSIZE]; - cpu = sched_getcpu(); + cpu = do_sched_getcpu(); if (cpu < 0) cpu = 0; diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h index 68888c2..94a5a7d 100644 --- a/tools/perf/util/cloexec.h +++ b/tools/perf/util/cloexec.h @@ -3,10 +3,4 @@ unsigned long perf_event_open_cloexec_flag(void); -#ifdef __GLIBC_PREREQ -#if !__GLIBC_PREREQ(2, 6) -extern int sched_getcpu(void) __THROW; -#endif -#endif - #endif /* __PERF_CLOEXEC_H */ -- 2.1.0
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