tree 82baf166086dc535e46a7d853120fe0b5f0aefd2
parent 8dcf188973549e89ed751a10911eab5ff91a98e8
author Heiko Carstens <hca@linux.ibm.com> 1597251341 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1598430663 +0200

s390/runtime_instrumentation: fix storage key handling

[ Upstream commit 9eaba29c7985236e16468f4e6a49cc18cf01443e ]

The key member of the runtime instrumentation control block contains
only the access key, not the complete storage key. Therefore the value
must be shifted by four bits.
Note: this is only relevant for debugging purposes in case somebody
compiles a kernel with a default storage access key set to a value not
equal to zero.

Fixes: e4b8b3f33fca ("s390: add support for runtime instrumentation")
Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>