+ kfence-test-fail-fast-if-disabled-at-boot.patch added to -mm tree

+ kfence-test-fail-fast-if-disabled-at-boot.patch added to -mm tree

[akpm]

The patch titled
     Subject: kfence: test: fail fast if disabled at boot
has been added to the -mm tree.  Its filename is
     kfence-test-fail-fast-if-disabled-at-boot.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kfence-test-fail-fast-if-disabled-at-boot.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kfence-test-fail-fast-if-disabled-at-boot.patch

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------------------------------------------------------
From: Marco Elver <elver@google.com>
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@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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
@@ -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';
_

Patches currently in -mm which might be from elver@google.com are

kfence-show-cpu-and-timestamp-in-alloc-free-info.patch
kfence-test-fail-fast-if-disabled-at-boot.patch