libkmod: Avoid calling syscall() with -1
At least in qemu 1.4.1 for vexpress/arm-cortexa9, this resulted in an
illegal instruction error. Solve that by returning an error when
__NR_finit_module is -1.
diff --git a/libkmod/missing.h b/libkmod/missing.h
index edb88b9..b45bbe2 100644
--- a/libkmod/missing.h
+++ b/libkmod/missing.h
@@ -20,8 +20,15 @@
#endif
#ifndef HAVE_FINIT_MODULE
+#include <errno.h>
+
static inline int finit_module(int fd, const char *uargs, int flags)
{
+ if (__NR_finit_module == -1) {
+ errno = ENOSYS;
+ return -1;
+ }
+
return syscall(__NR_finit_module, fd, uargs, flags);
}
#endif
