selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()
authorRam Pai <linuxram@us.ibm.com>
Thu, 4 Jun 2020 23:52:01 +0000 (16:52 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 5 Jun 2020 02:06:27 +0000 (19:06 -0700)
commitea5f95c3d6bb117abfe41fd2612f3213cf22b609
treeac2e4b4e9dc9a3cb1a4c6f83b35a23a38cd14077
parent11551801a71c84b9713abf1b588933eea141e362
selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()

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.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/8240665131e43fc93eed4eea8194676c1ea39a7f.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
tools/testing/selftests/vm/protection_keys.c