AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-16 14:46:43 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()

Browse Source 
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>
This commit is contained in:
Ram Pai 2020-06-04 16:52:01 -07:00 committed by Linus Torvalds
parent 11551801a7
commit ea5f95c3d6
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/testing/selftests/vm/protection_keys.c
View File

@ -400,7 +400,7 @@ void pkey_disable_set(int pkey, int flags)
dprintf1("%s(%d) pkey_reg: 0x%016llx\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);
}
@ -431,7 +431,7 @@ void pkey_disable_clear(int pkey, int flags)
dprintf1("%s(%d) pkey_reg: 0x%016llx\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)