From: Alessandro Carminati <acarmina@redhat.com>
Introduce a dedicated Kconfig option to enable extended KUnit testing
for /dev/mem behavior.
The option enables tests covering I/O memory access restrictions,
including behavior under CONFIG_IO_STRICT_DEVMEM. Because the tests may
perform reads from I/O regions, they are opt-in and documented with
appropriate warnings.
This keeps test coverage explicit and avoids unintended hardware
side effects.
Signed-off-by: Alessandro Carminati <acarmina@redhat.com>
---
drivers/char/Kconfig | 21 +++++++++++++++++++++
drivers/char/Makefile | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index d2cfc584e202..cd3e47b47f44 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -317,6 +317,27 @@ config DEVMEM
memory.
When in doubt, say "Y".
+config DEVMEM_KUNIT_TEST
+ tristate "KUnit tests for /dev/mem" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enables in-kernel unit tests for /dev/mem read/write logic.
+
+config DEVMEM_KUNIT_TEST_IO
+ bool "KUnit tests for /dev/mem extended to I/O space"
+ depends on DEVMEM_KUNIT_TEST
+ default n
+ help
+ Extend KUnit tests for devmem to cover IO space.
+ When CONFIG_IO_STRICT_DEVMEM is enabled, the kernel denies
+ access to claimed IO regions. Enabling this option adds two
+ KUnit test cases to verify this behavior.
+ Note: These tests perform read operations, which can have
+ side effects on certain hardware.
+ Enable this only if you are certain your hardware handles
+ unsolicited reads safely.
+
config NVRAM
tristate "/dev/nvram support"
depends on X86 || HAVE_ARCH_NVRAM_OPS
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 1291369b9126..176f2b8f98dc 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -4,6 +4,7 @@
#
obj-y += mem.o random.o
+obj-$(CONFIG_DEVMEM_KUNIT_TEST) += mem_kunit_test.o
obj-$(CONFIG_TTY_PRINTK) += ttyprintk.o
obj-y += misc.o
obj-$(CONFIG_TEST_MISC_MINOR) += misc_minor_kunit.o
--
2.48.1