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authorHeiko Carstens <hca@linux.ibm.com>2020-08-12 18:55:41 +0200
committerHeiko Carstens <hca@linux.ibm.com>2020-08-17 13:17:10 +0200
commit9eaba29c7985236e16468f4e6a49cc18cf01443e (patch)
tree30e7b6157f5803b4d766d2104a65c1f557e4c68d /arch
parentb76fee1bc56c31a9d2a49592810eba30cc06d61a (diff)
s390/runtime_instrumentation: fix storage key handling
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/runtime_instr.c2
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;
}