The pthread_attr_setaffinity_np function is a GNU extension that may not
be available in non-glibc C libraries. Some KVM selftests use this
function for CPU affinity control.
Add a function declaration and weak stub implementation for non-glibc
builds. This allows tests to build, with the affinity setting being a
no-op and errno set for the caller when the actual function is not available.
Signed-off-by: Aqib Faruqui <aqi...@amazon.com>
---
tools/testing/selftests/kvm/include/kvm_util.h | 4 ++++
tools/testing/selftests/kvm/lib/kvm_util.c | 11 +++++++++++
2 files changed, 15 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h
b/tools/testing/selftests/kvm/include/kvm_util.h
index 7fae7f5e7..8177178b5 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -31,6 +31,10 @@
#include "kvm_util_types.h"
#include "sparsebit.h"
+#ifndef __GLIBC__
+int pthread_attr_setaffinity_np(pthread_attr_t *attr, size_t cpusetsize, const
cpu_set_t *cpuset);
+#endif /* __GLIBC__ */
+
#define KVM_DEV_PATH "/dev/kvm"
#define KVM_MAX_VCPUS 512
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c
b/tools/testing/selftests/kvm/lib/kvm_util.c
index c3f5142b0..5ce80303d 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -20,6 +20,17 @@
#define KVM_UTIL_MIN_PFN 2
+#ifndef __GLIBC__
+int __attribute__((weak))
+pthread_attr_setaffinity_np(pthread_attr_t *__attr,
+ size_t __cpusetsize,
+ const cpu_set_t *__cpuset)
+{
+ errno = ENOSYS;
+ return -1;
+}
+#endif
+
uint32_t guest_random_seed;
struct guest_random_state guest_rng;
static uint32_t last_guest_seed;
--
2.47.3
