diff options
Diffstat (limited to 'drivers/dax/dax.c')
| -rw-r--r-- | drivers/dax/dax.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 152552d2c306..193224889e41 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -24,6 +24,7 @@ #include "dax.h" static dev_t dax_devt; +DEFINE_STATIC_SRCU(dax_srcu); static struct class *dax_class; static DEFINE_IDA(dax_minor_ida); static int nr_dax = CONFIG_NR_DEV_DAX; @@ -59,7 +60,7 @@ struct dax_region { * @region - parent region * @dev - device backing the character device * @cdev - core chardev data - * @alive - !alive + rcu grace period == no new mappings can be established + * @alive - !alive + srcu grace period == no new mappings can be established * @id - child id in the region * @num_resources - number of physical address extents in this device * @res - array of physical address ranges @@ -437,7 +438,7 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, static int dax_dev_pmd_fault(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, unsigned int flags) { - int rc; + int rc, id; struct file *filp = vma->vm_file; struct dax_dev *dax_dev = filp->private_data; @@ -445,9 +446,9 @@ static int dax_dev_pmd_fault(struct vm_area_struct *vma, unsigned long addr, current->comm, (flags & FAULT_FLAG_WRITE) ? "write" : "read", vma->vm_start, vma->vm_end); - rcu_read_lock(); + id = srcu_read_lock(&dax_srcu); rc = __dax_dev_pmd_fault(dax_dev, vma, addr, pmd, flags); - rcu_read_unlock(); + srcu_read_unlock(&dax_srcu, id); return rc; } @@ -563,11 +564,11 @@ static void unregister_dax_dev(void *dev) * Note, rcu is not protecting the liveness of dax_dev, rcu is * ensuring that any fault handlers that might have seen * dax_dev->alive == true, have completed. Any fault handlers - * that start after synchronize_rcu() has started will abort + * that start after synchronize_srcu() has started will abort * upon seeing dax_dev->alive == false. */ dax_dev->alive = false; - synchronize_rcu(); + synchronize_srcu(&dax_srcu); unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1); cdev_del(cdev); device_unregister(dev); |