linux-kernel - [RFC v6 51/62] selftest/vm: pkey register should match shadow pkey

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Date:   Sat, 15 Jul 2017 20:56:53 -0700
From:   Ram Pai <linuxram@...ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
        linuxram@...ibm.com, arnd@...db.de, akpm@...ux-foundation.org,
        corbet@....net, mingo@...hat.com, mhocko@...nel.org
Subject: [RFC v6 51/62] selftest/vm: pkey register should match shadow pkey

expected_pkey_fault() is comparing the contents of pkey
register with 0. This may not be true all the time. There
could be bits set by default by the architecture
which can never be changed. Hence compare the value against
shadow pkey register, which is supposed to track the bits
accurately all throughout

Signed-off-by: Ram Pai <linuxram@...ibm.com>
---
 tools/testing/selftests/vm/protection_keys.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 20bab6d..f21e177 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -926,10 +926,10 @@ void expected_pkey_fault(int pkey)
 	pkey_assert(last_pkey_faults + 1 == pkey_faults);
 	pkey_assert(last_si_pkey == pkey);
 	/*
-	 * The signal handler shold have cleared out PKEY register to let the
+	 * The signal handler shold have cleared out pkey-register to let the
 	 * test program continue.  We now have to restore it.
 	 */
-	if (__rdpkey_reg() != 0)
+	if (__rdpkey_reg() != shadow_pkey_reg)
 		pkey_assert(0);
 
 	__wrpkey_reg(shadow_pkey_reg);
-- 
1.7.1