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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: e4b8b3f33f ("s390: add support for runtime instrumentation")
Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-08-12 18:55:41 +02:00
parent b76fee1bc5
commit 9eaba29c79
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/runtime_instr.c
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@ -57,7 +57,7 @@ static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
cb->k = 1; cb->k = 1;
cb->ps = 1; cb->ps = 1;
cb->pc = 1; cb->pc = 1;
cb->key = PAGE_DEFAULT_KEY; cb->key = PAGE_DEFAULT_KEY >> 4;
cb->v = 1; cb->v = 1;
} }