diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2020-08-12 18:55:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 11:42:18 +0200 |
| commit | 1ca48fa64aeda2ca090fe7d2e21fe9567b4e95a3 (patch) | |
| tree | eaa601b7225af3a8724d34f7dcde9f7952d24a59 | |
| parent | 4a2136e55a20caaa6f3910a9b632c2150e06f75b (diff) | |
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>
| -rw-r--r-- | arch/s390/kernel/runtime_instr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/runtime_instr.c b/arch/s390/kernel/runtime_instr.c index 125c7f6e8715..1788a5454b6f 100644 --- a/arch/s390/kernel/runtime_instr.c +++ b/arch/s390/kernel/runtime_instr.c @@ -57,7 +57,7 @@ static void init_runtime_instr_cb(struct runtime_instr_cb *cb) cb->k = 1; cb->ps = 1; cb->pc = 1; - cb->key = PAGE_DEFAULT_KEY; + cb->key = PAGE_DEFAULT_KEY >> 4; cb->v = 1; } |