io_uring: add GCOV_PROFILE_URING Kconfig option
If GCOV is enabled and this option is set, it enables code coverage
profiling of the io_uring subsystem. Only use this for test purposes,
as it will impact the runtime performance.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/init/Kconfig b/init/Kconfig
index 5783a0b..3b6ca7c 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1687,6 +1687,19 @@
applications to submit and complete IO through submission and
completion rings that are shared between the kernel and application.
+config GCOV_PROFILE_URING
+ bool "Enable GCOV profiling on the io_uring subsystem"
+ depends on GCOV_KERNEL
+ help
+ Enable GCOV profiling on the io_uring subsystem, to facilitate
+ code coverage testing.
+
+ If unsure, say N.
+
+ Note that this will have a negative impact on the performance of
+ the io_uring subsystem, hence this should only be enabled for
+ specific test purposes.
+
config ADVISE_SYSCALLS
bool "Enable madvise/fadvise syscalls" if EXPERT
default y
diff --git a/io_uring/Makefile b/io_uring/Makefile
index 61923e1..53167bef 100644
--- a/io_uring/Makefile
+++ b/io_uring/Makefile
@@ -2,6 +2,10 @@
#
# Makefile for io_uring
+ifdef CONFIG_GCOV_PROFILE_URING
+GCOV_PROFILE := y
+endif
+
obj-$(CONFIG_IO_URING) += io_uring.o opdef.o kbuf.o rsrc.o notif.o \
tctx.o filetable.o rw.o net.o poll.o \
eventfd.o uring_cmd.o openclose.o \
