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s390/cpufeature: Convert MACHINE_HAS_TLB_LC to cpu_has_tlb_lc()

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Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead
of testing the machine_flags lowcore member if the feature is present.

test_facility() generates better code since it results in a static branch
without accessing memory. The branch is patched via alternatives by the
decompressor depending on the availability of the required facility.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2025-02-07 15:48:51 +01:00
committed by Vasily Gorbik
parent b49ee5b386
commit 8e31fea55d
4 changed files with 5 additions and 7 deletions
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2
arch/s390/kernel/early.c
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@@ -249,8 +249,6 @@ static __init void detect_machine_facilities(void)
get_lowcore()->machine_flags |= MACHINE_FLAG_TE;
system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
}
if (test_facility(51))
get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC;
if (test_facility(129))
system_ctl_set_bit(0, CR0_VECTOR_BIT);
if (test_facility(139) && (tod_clock_base.tod >> 63)) {