kcsan: selftest: Ensure that address is at least PAGE_SIZE

In preparation of supporting only addresses not within the NULL page,
change the selftest to never use addresses that are less than PAGE_SIZE.

Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index d98bc208d06db8cb24ffac73d684b99b4bde436c..9014a3a82cf9c18b2e2159dd13d71b66150a3983 100644 (file)
--- a/kernel/kcsan/selftest.c
+++ b/kernel/kcsan/selftest.c
@@ -33,6 +33,9 @@ static bool test_encode_decode(void)
                unsigned long addr;
 
                prandom_bytes(&addr, sizeof(addr));
+               if (addr < PAGE_SIZE)
+                       addr = PAGE_SIZE;
+
                if (WARN_ON(!check_encodable(addr, size)))
                        return false;