diff options
| author | Heiko Carstens <[email protected]> | 2024-11-26 11:25:13 +0100 |
|---|---|---|
| committer | Heiko Carstens <[email protected]> | 2024-11-27 12:55:15 +0100 |
| commit | 5618c53d96d1bf2df07df8b9204773db28acbc1b (patch) | |
| tree | e270549b85efe377ca3a3d84d5e603100cf42ba3 /arch/s390/kvm/kvm-s390.c | |
| parent | 7726b55b5d6c22dc0e66570597bf6e43d410d093 (diff) | |
KVM: s390: Use try_cmpxchg() instead of cmpxchg() loops
Convert all cmpxchg() loops to try_cmpxchg() loops. With gcc 14 and the
usage of flag output operands in try_cmpxchg() this allows the compiler to
generate slightly better code.
Acked-by: Claudio Imbrenda <[email protected]>
Acked-by: Janosch Frank <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Carstens <[email protected]>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index deeb32034ad5..a1fcdb2479a1 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1907,11 +1907,11 @@ static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val) read_lock(&kvm->arch.sca_lock); sca = kvm->arch.sca; + old = READ_ONCE(sca->utility); do { - old = READ_ONCE(sca->utility); new = old; new.mtcr = val; - } while (cmpxchg(&sca->utility.val, old.val, new.val) != old.val); + } while (!try_cmpxchg(&sca->utility.val, &old.val, new.val)); read_unlock(&kvm->arch.sca_lock); } |