Add is_cpu_online() utility function: a wrapper for
"/sys/devices/system/cpu/cpu%d/online".
Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
---
tools/testing/selftests/kvm/include/test_util.h | 2 ++
tools/testing/selftests/kvm/lib/test_util.c | 16 ++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 99e0dcdc923f..14084dc4e152 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -143,4 +143,6 @@ static inline void *align_ptr_up(void *x, size_t size)
return (void *)align_up((unsigned long)x, size);
}
+bool is_cpu_online(int pcpu);
+
#endif /* SELFTEST_KVM_TEST_UTIL_H */
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index 6d23878bbfe1..81950e6b6d10 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -334,3 +334,19 @@ long get_run_delay(void)
return val[1];
}
+
+bool is_cpu_online(int pcpu)
+{
+ char p[128];
+ FILE *fp;
+ int ret;
+
+ snprintf(p, sizeof(p), "/sys/devices/system/cpu/cpu%d/online", pcpu);
+ fp = fopen(p, "r");
+ if (!fp)
+ return false;
+ assert(fscanf(fp, "%d ", &ret) == 1);
+ fclose(fp);
+
+ return !!ret;
+}
--
2.35.1.894.gb6a874cedc-goog
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