linux-kernel - [PATCH] kcov: do not instrument lib/stackdepot.c

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Date:   Fri, 23 Sep 2016 16:29:32 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     dvyukov@...gle.com, kcc@...gle.com, akpm@...ux-foundation.org,
        andreyknvl@...gle.com
Cc:     linux-kernel@...r.kernel.org, syzkaller@...glegroups.com
Subject: [PATCH] kcov: do not instrument lib/stackdepot.c

There's no point in collecting coverage from lib/stackdepot.c, as it is
not a function of syscall inputs. Disabling kcov instrumentation for
that file will reduce the coverage noise level.

Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
 lib/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Makefile b/lib/Makefile
index 5dc77a8..cbac596 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -180,6 +180,7 @@ obj-$(CONFIG_IRQ_POLL) += irq_poll.o
 
 obj-$(CONFIG_STACKDEPOT) += stackdepot.o
 KASAN_SANITIZE_stackdepot.o := n
+KCOV_INSTRUMENT_stackdepot.o := n
 
 libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
 	       fdt_empty_tree.o
-- 
2.8.0.rc3.226.g39d4020