linux-kernel - [PATCH] kfence: test: fail fast if disabled at boot

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Date:   Wed, 25 Aug 2021 12:55:33 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, akpm@...ux-foundation.org
Cc:     glider@...gle.com, dvyukov@...gle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kasan-dev@...glegroups.com,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH] kfence: test: fail fast if disabled at boot

Fail kfence_test fast if KFENCE was disabled at boot, instead of each
test case trying several seconds to allocate from KFENCE and failing.
KUnit will fail all test cases if kunit_suite::init returns an error.

Even if KFENCE was disabled, we still want the test to fail, so that CI
systems that parse KUnit output will alert on KFENCE being disabled
(accidentally or otherwise).

Reported-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Signed-off-by: Marco Elver <elver@...gle.com>
---
 mm/kfence/kfence_test.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
index eb6307c199ea..f1690cf54199 100644
--- a/mm/kfence/kfence_test.c
+++ b/mm/kfence/kfence_test.c
@@ -800,6 +800,9 @@ static int test_init(struct kunit *test)
 	unsigned long flags;
 	int i;
 
+	if (!__kfence_pool)
+		return -EINVAL;
+
 	spin_lock_irqsave(&observed.lock, flags);
 	for (i = 0; i < ARRAY_SIZE(observed.lines); i++)
 		observed.lines[i][0] = '\0';
-- 
2.33.0.rc2.250.ged5fa647cd-goog