Fix build error with kernels too old to support ktime_get_real (#1624)

* Fix build error with kernels too old to support ktime_get_real * fix(driver): use timespec instead of timeval for kernels < 3.17 Co-Authored-By: Leonardo Di Donato <[email protected]> Signed-off-by: Lorenzo Fontana <[email protected]> Co-authored-by: Lorenzo Fontana <[email protected]> Co-authored-by: Leonardo Di Donato <[email protected]>
draios · May 6, 2020 · 96bd9bc · 96bd9bc
1 parent c4af1a9
commit 96bd9bc
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/driver/main.c b/driver/main.c
@@ -218,7 +218,14 @@ do {								\
 
 static inline nanoseconds ppm_nsecs(void)
 {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0))
 	return ktime_get_real_ns();
+#else
+	/* Don't have ktime_get_real functions */
+	struct timespec ts;
+	getnstimeofday(&ts);
+	return SECOND_IN_NS * ts.tv_sec + ts.tv_nsec;
+#endif
 }
 
 inline void ppm_syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned long *args)