After the removal of the device-public infrastructure there are only 2 ->page_free() call backs in the kernel. One of those is a device-private callback in the nouveau driver, the other is a generic wakeup needed in the DAX case. In the hopes that all ->page_free() callbacks can be migrated to common core kernel functionality, move the device-private specific actions in __put_devmap_managed_page() under the is_device_private_page() conditional, including the ->page_free() callback. For the other page types just open-code the generic wakeup.
Yes, the wakeup is only needed in the MEMORY_DEVICE_FSDAX case, but it does no harm in the MEMORY_DEVICE_DEVDAX and MEMORY_DEVICE_PCI_P2PDMA case. Cc: Jan Kara <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Ira Weiny <[email protected]> Cc: Jérôme Glisse <[email protected]> Cc: John Hubbard <[email protected]> Signed-off-by: Dan Williams <[email protected]> --- Hi John, This applies on top of today's linux-next and passes my nvdimm unit tests. That testing noticed that devmap_managed_enable_get() needed a small fixup as well. drivers/nvdimm/pmem.c | 6 ------ mm/memremap.c | 22 ++++++++++++---------- 2 files changed, 12 insertions(+), 16 deletions(-) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index f9f76f6ba07b..21db1ce8c0ae 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -338,13 +338,7 @@ static void pmem_release_disk(void *__pmem) put_disk(pmem->disk); } -static void pmem_pagemap_page_free(struct page *page) -{ - wake_up_var(&page->_refcount); -} - static const struct dev_pagemap_ops fsdax_pagemap_ops = { - .page_free = pmem_pagemap_page_free, .kill = pmem_pagemap_kill, .cleanup = pmem_pagemap_cleanup, }; diff --git a/mm/memremap.c b/mm/memremap.c index 022e78e68ea0..6e6f3d6fdb73 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -27,7 +27,8 @@ static void devmap_managed_enable_put(void) static int devmap_managed_enable_get(struct dev_pagemap *pgmap) { - if (!pgmap->ops || !pgmap->ops->page_free) { + if (!pgmap->ops || (pgmap->type == MEMORY_DEVICE_PRIVATE + && !pgmap->ops->page_free)) { WARN(1, "Missing page_free method\n"); return -EINVAL; } @@ -449,12 +450,6 @@ void __put_devmap_managed_page(struct page *page) * holds a reference on the page. */ if (count == 1) { - /* Clear Active bit in case of parallel mark_page_accessed */ - __ClearPageActive(page); - __ClearPageWaiters(page); - - mem_cgroup_uncharge(page); - /* * When a device_private page is freed, the page->mapping field * may still contain a (stale) mapping value. For example, the @@ -476,10 +471,17 @@ void __put_devmap_managed_page(struct page *page) * handled differently or not done at all, so there is no need * to clear page->mapping. */ - if (is_device_private_page(page)) - page->mapping = NULL; + if (is_device_private_page(page)) { + /* Clear Active bit in case of parallel mark_page_accessed */ + __ClearPageActive(page); + __ClearPageWaiters(page); - page->pgmap->ops->page_free(page); + mem_cgroup_uncharge(page); + + page->mapping = NULL; + page->pgmap->ops->page_free(page); + } else + wake_up_var(&page->_refcount); } else if (!count) __put_page(page); } _______________________________________________ Linux-nvdimm mailing list -- [email protected] To unsubscribe send an email to [email protected]
