From: Marco Elver <elver@xxxxxxxxxx> Subject: 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). Link: https://lkml.kernel.org/r/20210825105533.1247922-1-elver@xxxxxxxxxx Signed-off-by: Marco Elver <elver@xxxxxxxxxx> Reported-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Tested-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Acked-by: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/kfence/kfence_test.c | 3 +++ 1 file changed, 3 insertions(+) --- a/mm/kfence/kfence_test.c~kfence-test-fail-fast-if-disabled-at-boot +++ a/mm/kfence/kfence_test.c @@ -789,6 +789,9 @@ 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'; _
