netdev - [PATCH net-next v2 2/3] net: rds: add option for GCOV profiling

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Message-Id: <20240806153809.282716-3-allison.henderson@oracle.com>
Date: Tue,  6 Aug 2024 08:38:08 -0700
From: allison.henderson@...cle.com
To: netdev@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org, rds-devel@....oracle.com,
        linux-rdma@...r.kernel.org, oberpar@...ux.ibm.com,
        chuck.lever@...cle.com, vegard.nossum@...cle.com,
        Allison Henderson <allison.henderson@...cle.com>
Subject: [PATCH net-next v2 2/3] net: rds: add option for GCOV profiling

From: Vegard Nossum <vegard.nossum@...cle.com>

To better our unit tests we need code coverage to be part of the kernel.
This patch borrows heavily from how CONFIG_GCOV_PROFILE_FTRACE is
implemented

Reviewed-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
Signed-off-by: Allison Henderson <allison.henderson@...cle.com>
---
 net/rds/Kconfig  | 9 +++++++++
 net/rds/Makefile | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/net/rds/Kconfig b/net/rds/Kconfig
index 75cd696963b2..f007730aa2bb 100644
--- a/net/rds/Kconfig
+++ b/net/rds/Kconfig
@@ -26,3 +26,12 @@ config RDS_DEBUG
 	bool "RDS debugging messages"
 	depends on RDS
 	default n
+
+config GCOV_PROFILE_RDS
+	bool "Enable GCOV profiling on RDS"
+	depends on GCOV_KERNEL
+	help
+	  Enable GCOV profiling on RDS for checking which functions/lines
+	  are executed.
+
+	  If unsure, say N.
diff --git a/net/rds/Makefile b/net/rds/Makefile
index 8fdc118e2927..3af1ca1d965c 100644
--- a/net/rds/Makefile
+++ b/net/rds/Makefile
@@ -15,3 +15,8 @@ rds_tcp-y :=		tcp.o tcp_connect.o tcp_listen.o tcp_recv.o \
 			tcp_send.o tcp_stats.o
 
 ccflags-$(CONFIG_RDS_DEBUG)	:=	-DRDS_DEBUG
+
+# for GCOV coverage profiling
+ifdef CONFIG_GCOV_PROFILE_RDS
+GCOV_PROFILE := y
+endif
-- 
2.25.1