[tip: core/rcu] rcu: Provide debug symbols and line numbers in KCSAN runs

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     8a7e8f51714004112a0bbbf751f3dd0fcbbbc983
Gitweb:        https://git.kernel.org/tip/8a7e8f51714004112a0bbbf751f3dd0fcbbbc983
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Thu, 02 Jan 2020 16:48:05 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Thu, 20 Feb 2020 15:58:21 -08:00

rcu: Provide debug symbols and line numbers in KCSAN runs

This commit adds "-g -fno-omit-frame-pointer" to ease interpretation
of KCSAN output, but only for CONFIG_KCSAN=y kerrnels.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 kernel/rcu/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/rcu/Makefile b/kernel/rcu/Makefile
index 82d5fba..f91f2c2 100644
--- a/kernel/rcu/Makefile
+++ b/kernel/rcu/Makefile
@@ -3,6 +3,10 @@
 # and is generally not a function of system call inputs.
 KCOV_INSTRUMENT := n
 
+ifeq ($(CONFIG_KCSAN),y)
+KBUILD_CFLAGS += -g -fno-omit-frame-pointer
+endif
+
 obj-y += update.o sync.o
 obj-$(CONFIG_TREE_SRCU) += srcutree.o
 obj-$(CONFIG_TINY_SRCU) += srcutiny.o