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Subject[PATCH] selftests: kvm: Fix a compile error in selftests/kvm/rseq_test.c
From: Jinrong Liang <>

The following warning appears when executing:
make -C tools/testing/selftests/kvm

rseq_test.c: In function ‘main’:
rseq_test.c:237:33: warning: implicit declaration of function ‘gettid’; did you mean ‘getgid’? [-Wimplicit-function-declaration]
(void *)(unsigned long)gettid());
/usr/bin/ld: /tmp/ccr5mMko.o: in function `main':
../kvm/tools/testing/selftests/kvm/rseq_test.c:237: undefined reference to `gettid'
collect2: error: ld returned 1 exit status
make: *** [../ ../kvm/tools/testing/selftests/kvm/rseq_test] Error 1

Use the more compatible syscall(SYS_gettid) instead of gettid() to fix it.
More subsequent reuse may cause it to be wrapped in a lib file.

Signed-off-by: Jinrong Liang <>
tools/testing/selftests/kvm/rseq_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/rseq_test.c b/tools/testing/selftests/kvm/rseq_test.c
index a54d4d05a058..299d316cc759 100644
--- a/tools/testing/selftests/kvm/rseq_test.c
+++ b/tools/testing/selftests/kvm/rseq_test.c
@@ -229,7 +229,7 @@ int main(int argc, char *argv[])
ucall_init(vm, NULL);

pthread_create(&migration_thread, NULL, migration_worker,
- (void *)(unsigned long)gettid());
+ (void *)(unsigned long)syscall(SYS_gettid));

for (i = 0; !done; i++) {
 \ /
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