diff options
Diffstat (limited to 'drivers/vfio/vfio_iommu_spapr_tce.c')
| -rw-r--r-- | drivers/vfio/vfio_iommu_spapr_tce.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index 40ddc0c5f677..9e54b0451eb7 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -36,7 +36,8 @@ static void tce_iommu_detach_group(void *iommu_data, static long try_increment_locked_vm(struct mm_struct *mm, long npages) { - long ret = 0, locked, lock_limit; + long ret = 0, lock_limit; + s64 locked; if (WARN_ON_ONCE(!mm)) return -EPERM; @@ -45,16 +46,16 @@ static long try_increment_locked_vm(struct mm_struct *mm, long npages) return 0; down_write(&mm->mmap_sem); - locked = mm->locked_vm + npages; + locked = atomic64_read(&mm->locked_vm) + npages; lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) ret = -ENOMEM; else - mm->locked_vm += npages; + atomic64_add(npages, &mm->locked_vm); pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, npages << PAGE_SHIFT, - mm->locked_vm << PAGE_SHIFT, + atomic64_read(&mm->locked_vm) << PAGE_SHIFT, rlimit(RLIMIT_MEMLOCK), ret ? " - exceeded" : ""); @@ -69,12 +70,12 @@ static void decrement_locked_vm(struct mm_struct *mm, long npages) return; down_write(&mm->mmap_sem); - if (WARN_ON_ONCE(npages > mm->locked_vm)) - npages = mm->locked_vm; - mm->locked_vm -= npages; + if (WARN_ON_ONCE(npages > atomic64_read(&mm->locked_vm))) + npages = atomic64_read(&mm->locked_vm); + atomic64_sub(npages, &mm->locked_vm); pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, npages << PAGE_SHIFT, - mm->locked_vm << PAGE_SHIFT, + atomic64_read(&mm->locked_vm) << PAGE_SHIFT, rlimit(RLIMIT_MEMLOCK)); up_write(&mm->mmap_sem); } |