sched_getcpu may not be present and so a feature test and definition
exist to workaround this in the build. The feature test is used to
define HAVE_SCHED_GETCPU_SUPPORT and so this is sufficient to know
whether the local sched_getcpu is needed and a weak symbol can be
avoided.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Pavithra Gurushankar <gpavithrasha@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Tom Rix <trix@redhat.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20230311065753.3012826-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
-int __weak sched_getcpu(void)
-{
-#ifdef __NR_getcpu
- unsigned cpu;
- int err = syscall(__NR_getcpu, &cpu, NULL, NULL);
- if (!err)
- return cpu;
-#else
- errno = ENOSYS;
-#endif
- return -1;
-}
-
static int perf_flag_probe(void)
{
/* use 'safest' configuration as used in evsel__fallback() */
*arr_sz = new_sz;
return 0;
}
+
+#ifndef HAVE_SCHED_GETCPU_SUPPORT
+int sched_getcpu(void)
+{
+#ifdef __NR_getcpu
+ unsigned int cpu;
+ int err = syscall(__NR_getcpu, &cpu, NULL, NULL);
+
+ if (!err)
+ return cpu;
+#else
+ errno = ENOSYS;
+#endif
+ return -1;
+}
+#endif