linux-kernel - [PATCH v10 14/24] selftests/vm: clear the bits in shadow reg when a pkey is freed.

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Message-Id: <1516647137-11174-15-git-send-email-linuxram@us.ibm.com>
Date:   Mon, 22 Jan 2018 10:52:07 -0800
From:   Ram Pai <linuxram@...ibm.com>
To:     shuahkh@....samsung.com, linux-kselftest@...r.kernel.org
Cc:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, akpm@...ux-foundation.org, dave.hansen@...el.com,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com,
        linuxram@...ibm.com, arnd@...db.de
Subject: [PATCH v10 14/24] selftests/vm: clear the bits in shadow reg when a pkey is freed.

When a key is freed, the  key  is  no  more  effective.
Clear the bits corresponding to the pkey in the shadow
register. Otherwise  it  will carry some spurious bits
which can trigger false-positive asserts.

Signed-off-by: Ram Pai <linuxram@...ibm.com>
---
 tools/testing/selftests/vm/protection_keys.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 55a25e1..d1cbdfe 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -586,7 +586,8 @@ int sys_pkey_free(unsigned long pkey)
 	int ret = syscall(SYS_pkey_free, pkey);
 
 	if (!ret)
-		shadow_pkey_reg &= reset_bits(pkey, PKEY_DISABLE_ACCESS);
+		shadow_pkey_reg &= reset_bits(pkey,
+				PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE);
 	dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret);
 	return ret;
 }
-- 
1.7.1