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s390/runtime_instrumentation: fix storage key handling

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[ 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: e4b8b3f33f ("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>
This commit is contained in:
Heiko Carstens 2020-08-12 18:55:41 +02:00 • committed by Greg Kroah-Hartman
commit d35f24bc56
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->ps = 1;
cb->pc = 1;
cb->key = PAGE_DEFAULT_KEY;
cb->key = PAGE_DEFAULT_KEY >> 4;
cb->v = 1;
}