diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-11-26 11:25:13 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-11-27 12:55:15 +0100 |
| commit | 5618c53d96d1bf2df07df8b9204773db28acbc1b (patch) | |
| tree | e270549b85efe377ca3a3d84d5e603100cf42ba3 /arch/s390/kvm/pci.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 <imbrenda@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20241126102515.3178914-2-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kvm/pci.c')
| -rw-r--r-- | arch/s390/kvm/pci.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c index a61518b549f0..9b9e7fdd5380 100644 --- a/arch/s390/kvm/pci.c +++ b/arch/s390/kvm/pci.c @@ -208,13 +208,12 @@ static inline int account_mem(unsigned long nr_pages) page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; + cur_pages = atomic_long_read(&user->locked_vm); do { - cur_pages = atomic_long_read(&user->locked_vm); new_pages = cur_pages + nr_pages; if (new_pages > page_limit) return -ENOMEM; - } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, - new_pages) != cur_pages); + } while (!atomic_long_try_cmpxchg(&user->locked_vm, &cur_pages, new_pages)); atomic64_add(nr_pages, ¤t->mm->pinned_vm); |