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author | David S. Miller <davem@davemloft.net> | 2017-04-20 10:35:33 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2017-04-20 10:35:33 -0400 |
commit | 7b9f6da175f9387ebfc202f35e0d39514899ab19 (patch) | |
tree | a884c05aaeff40d8f80831549cccc820dcdd0f4f /drivers/dax/dax.c | |
parent | 9868879f293c599ce13b584c5bd8800312970781 (diff) | |
parent | 1debdc8f9ebd07daf140e417b3841596911e0066 (diff) | |
download | op-kernel-dev-7b9f6da175f9387ebfc202f35e0d39514899ab19.zip op-kernel-dev-7b9f6da175f9387ebfc202f35e0d39514899ab19.tar.gz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
A function in kernel/bpf/syscall.c which got a bug fix in 'net'
was moved to kernel/bpf/verifier.c in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
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 80c6db279..806f180 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -25,6 +25,7 @@ #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; @@ -60,7 +61,7 @@ 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 @@ -569,7 +570,7 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) static int dax_dev_huge_fault(struct vm_fault *vmf, enum page_entry_size pe_size) { - int rc; + int rc, id; struct file *filp = vmf->vma->vm_file; struct dax_dev *dax_dev = filp->private_data; @@ -578,7 +579,7 @@ static int dax_dev_huge_fault(struct vm_fault *vmf, ? "write" : "read", vmf->vma->vm_start, vmf->vma->vm_end); - rcu_read_lock(); + id = srcu_read_lock(&dax_srcu); switch (pe_size) { case PE_SIZE_PTE: rc = __dax_dev_pte_fault(dax_dev, vmf); @@ -592,7 +593,7 @@ static int dax_dev_huge_fault(struct vm_fault *vmf, default: return VM_FAULT_FALLBACK; } - rcu_read_unlock(); + srcu_read_unlock(&dax_srcu, id); return rc; } @@ -713,11 +714,11 @@ 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); |