[PATCH 1/7] kasan: Add .kunitconfig for KUnit tests

[Bill Wendling <morbo@google.com>]

Add a .kunitconfig file for the KASAN test suite so that it can easily
be run via kunit.py:

    ./tools/testing/kunit/kunit.py run --arch=x86_64 --kunitconfig mm/kasan

CONFIG_KASAN_KUNIT_TEST depends on TRACEPOINTS, which is an invisible
Kconfig symbol without a prompt. CONFIG_FTRACE alone only unlocks the
tracer submenu and does not select TRACEPOINTS by itself, so also
enable CONFIG_SCHED_TRACER=y, which selects GENERIC_TRACER -> TRACING
-> TRACEPOINTS. This follows the same pattern used by
security/landlock/.kunitconfig. Verified with:

    make KCONFIG_ALLCONFIG=mm/kasan/.kunitconfig allnoconfig

that CONFIG_TRACEPOINTS=y and CONFIG_KASAN_KUNIT_TEST=y both resolve.

In addition, set CONFIG_LOG_BUF_SHIFT=20 to prevent printk buffer
overflows on serial consoles when running under QEMU, as KASAN generates
extensive reports across its test cases.

Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Bill Wendling <morbo@google.com>
---
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Mickaël Salaün" <mic@digikod.net>
Cc: "Günther Noack" <gnoack@google.com>
Cc: linux-kernel@vger.kernel.org
Cc: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org
Cc: linux-security-module@vger.kernel.org
---
 mm/kasan/.kunitconfig | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 mm/kasan/.kunitconfig

diff --git a/mm/kasan/.kunitconfig b/mm/kasan/.kunitconfig
new file mode 100644
index 000000000000..58a7448fa352
--- /dev/null
+++ b/mm/kasan/.kunitconfig
@@ -0,0 +1,15 @@
+CONFIG_KUNIT=y
+CONFIG_KASAN=y
+CONFIG_KASAN_KUNIT_TEST=y
+
+# Additional dependencies.
+# CONFIG_KASAN_KUNIT_TEST depends on TRACEPOINTS, an invisible Kconfig
+# symbol with no prompt. CONFIG_FTRACE alone only unlocks the tracer
+# submenu; CONFIG_SCHED_TRACER is needed to actually select
+# GENERIC_TRACER -> TRACING -> TRACEPOINTS.
+CONFIG_FTRACE=y
+CONFIG_SCHED_TRACER=y
+
+# Prevent printk buffer overflows on serial consoles when running under
+# QEMU, since KASAN generates extensive reports across its test cases.
+CONFIG_LOG_BUF_SHIFT=20
-- 
2.47.3