[v16,09/23] selftests/vm/pkeys: Fix assertion in pkey_disable_set/clear()
diff mbox series

Message ID e3c0eb44d6f79d3e67680a5facbbefc9f9020ddf.1579265066.git.sandipan@linux.ibm.com
State New
Headers show
  • selftests, powerpc, x86: Memory Protection Keys
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Commit Message

Sandipan Das Jan. 17, 2020, 12:49 p.m. UTC
From: Ram Pai <linuxram@us.ibm.com>

In some cases, a pkey's bits need not necessarily change
in a way that the value of the pkey register increases
when performing a pkey_disable_set() or decreases when
performing a pkey_disable_clear().

For example, on powerpc, if a pkey's current state is
PKEY_DISABLE_ACCESS and we perform a pkey_write_disable()
on it, the bits still remain the same. We will observe
something similar when the pkey's current state is 0 and
a pkey_access_enable() is performed on it.

Either case would cause some assertions to fail. This
fixes the problem.

cc: Dave Hansen <dave.hansen@intel.com>
cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
 tools/testing/selftests/vm/protection_keys.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff mbox series

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 7440f6fa7be3..e666b5d2aeeb 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -399,7 +399,7 @@  void pkey_disable_set(int pkey, int flags)
 	dprintf1("%s(%d) pkey_reg: 0x%016lx\n",
 		__func__, pkey, read_pkey_reg());
 	if (flags)
-		pkey_assert(read_pkey_reg() > orig_pkey_reg);
+		pkey_assert(read_pkey_reg() >= orig_pkey_reg);
 	dprintf1("END<---%s(%d, 0x%x)\n", __func__,
 		pkey, flags);
@@ -430,7 +430,7 @@  void pkey_disable_clear(int pkey, int flags)
 	dprintf1("%s(%d) pkey_reg: 0x%016lx\n", __func__,
 			pkey, read_pkey_reg());
 	if (flags)
-		assert(read_pkey_reg() < orig_pkey_reg);
+		assert(read_pkey_reg() <= orig_pkey_reg);
 void pkey_write_allow(int pkey)