Fix: show warning for broken clock work-around

[deliverable/lttng-modules.git] / wrapper / trace-clock.c

diff --git a/wrapper/trace-clock.c b/wrapper/trace-clock.c
index 23869ca831a79069d0f6336c5df1b2d834449919..d9bc956acb44c70c140520abea0340f1fe13702b 100644 (file)
--- a/wrapper/trace-clock.c
+++ b/wrapper/trace-clock.c
@@ -27,3 +27,7 @@
 DEFINE_PER_CPU(local_t, lttng_last_tsc);
 EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
+
+#ifdef LTTNG_CLOCK_NMI_SAFE_BROKEN
+#warning "Your kernel implements a bogus nmi-safe clock source. Falling back to the non-nmi-safe clock source, which discards events traced from NMI context. Upgrade your kernel to resolve this situation."
+#endif