kcsan: test: Initialize dummy variable

Newer compiler versions rightfully point out:

 kernel/kcsan/kcsan_test.c:591:41: error: variable 'dummy' is
 uninitialized when passed as a const pointer argument here
 [-Werror,-Wuninitialized-const-pointer]
   591 |         KCSAN_EXPECT_READ_BARRIER(atomic_read(&dummy), false);
       |                                                ^~~~~
 1 error generated.

Although this particular test does not care about the value stored in
the dummy atomic variable, let's silence the warning.

Link: https://lkml.kernel.org/r/CA+G9fYu8JY=k-r0hnBRSkQQrFJ1Bz+ShdXNwC1TNeMt0eXaxeA@mail.gmail.com
Fixes: 8bc32b348178 ("kcsan: test: Add test cases for memory barrier instrumentation")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Marco Elver <elver@google.com>

diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c
index c2871180edccc1c8dd121b1cded8d34a9648af56..49ab81faaed95f4f1f13edf1f7e7a8c5ef3fabcb 100644 (file)
--- a/kernel/kcsan/kcsan_test.c
+++ b/kernel/kcsan/kcsan_test.c
@@ -533,7 +533,7 @@ static void test_barrier_nothreads(struct kunit *test)
        struct kcsan_scoped_access *reorder_access = NULL;
 #endif
        arch_spinlock_t arch_spinlock = __ARCH_SPIN_LOCK_UNLOCKED;
-       atomic_t dummy;
+       atomic_t dummy = ATOMIC_INIT(0);
 
        KCSAN_TEST_REQUIRES(test, reorder_access != NULL);
        KCSAN_TEST_REQUIRES(test, IS_ENABLED(CONFIG_SMP));