Re: [PATCH v3 4/5] selftests/mm: Use generic pkey register manipulation

The test changes look good to me: Acked-by: Dave Hansen

[PATCH v3 4/5] selftests/mm: Use generic pkey register manipulation

pkey_sighandler_tests.c currently hardcodes x86 PKRU encodings. The first step towards running those tests on arm64 is to abstract away the pkey register values. Since those tests want to deny access to all keys except a few, we have each arch define PKEY_REG_ALLOW_NONE, the pkey register value de