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Check that vmalloc poisoning is not disabled via command line when running
the vmalloc-related KASAN tests.  Skip the tests otherwise.

Link: https://lkml.kernel.org/r/954456e50ac98519910c3e24a479a18eae62f8dd.1703188911.git.andreyknvl@google.com

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>