[RFC PATCH 7/8] dax/kmem: add the ltpin opt-in (CAP_LTPIN) for private nodes
Gregory Price <[email protected]>
| Newsgroups | org.kernel.vger.linux-cxl,dev.linux.lists.nvdimm,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
Add "ltpin" opt-in setting for NODE_PRIVATE_CAP_LTPIN so long-term GUP pins (FOLL_LONGTERM) may target the node's folios. Long-term pins block migration and hot-unplug indefinitely, so they are refused on a private node unless it explicitly opts in. Signed-off-by: Gregory Price <[email protected]> --- drivers/dax/kmem.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c index 1cb3384c003e3..c33dac5939edd 100644 --- a/drivers/dax/kmem.c +++ b/drivers/dax/kmem.c @@ -633,6 +633,7 @@ KMEM_PRIVATE_CAP_ATTR(user_numa, NODE_PRIVATE_CAP_USER_NUMA); KMEM_PRIVATE_CAP_ATTR(hotunplug, NODE_PRIVATE_CAP_HOTUNPLUG); KMEM_PRIVATE_CAP_ATTR(demotion, NODE_PRIVATE_CAP_DEMOTION); KMEM_PRIVATE_CAP_ATTR(numa_balancing, NODE_PRIVATE_CAP_NUMA_BALANCING); +KMEM_PRIVATE_CAP_ATTR(ltpin, NODE_PRIVATE_CAP_LTPIN); /* Per-service opt-ins. Visibility toggled by 'private' control */ static struct attribute *dax_kmem_private_attrs[] = { @@ -641,6 +642,7 @@ static struct attribute *dax_kmem_private_attrs[] = { &dev_attr_hotunplug.attr, &dev_attr_demotion.attr, &dev_attr_numa_balancing.attr, + &dev_attr_ltpin.attr, NULL, }; static const struct attribute_group dax_kmem_private_group = { -- 2.53.0-Meta