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This is currently the case for MEMORY_DEVICE_PRIVATE and MEMORY_DEVICE_COHERENT pages but not MEMORY_DEVICE_PCI_P2PDMA pages so fix that up. Signed-off-by: Alistair Popple --- drivers/pci/p2pdma.c | 2 ++ mm/memremap.c | 8 ++++---- mm/mm_init.c | 4 +++- 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4f47a13..1e9ea32 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -128,6 +128,8 @@ static int p2pmem_alloc_mmap(struct file *filp, struct kobject *kobj, goto out; } + set_page_count(virt_to_page(kaddr), 1); + /* * vm_insert_page() can sleep, so a reference is taken to mapping * such that rcu_read_unlock() can be done before inserting the diff --git a/mm/memremap.c b/mm/memremap.c index 40d4547..caccbd8 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -488,15 +488,15 @@ void free_zone_device_folio(struct folio *folio) folio->mapping = NULL; folio->page.pgmap->ops->page_free(folio_page(folio, 0)); - if (folio->page.pgmap->type != MEMORY_DEVICE_PRIVATE && - folio->page.pgmap->type != MEMORY_DEVICE_COHERENT) + if (folio->page.pgmap->type == MEMORY_DEVICE_PRIVATE || + folio->page.pgmap->type == MEMORY_DEVICE_COHERENT) + put_dev_pagemap(folio->page.pgmap); + else if (folio->page.pgmap->type != MEMORY_DEVICE_PCI_P2PDMA) /* * Reset the refcount to 1 to prepare for handing out the page * again. */ folio_set_count(folio, 1); - else - put_dev_pagemap(folio->page.pgmap); } void zone_device_page_init(struct page *page) diff --git a/mm/mm_init.c b/mm/mm_init.c index 3ec0493..b7e1599 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -6,6 +6,7 @@ * Author Mel Gorman * */ +#include "linux/memremap.h" #include #include #include @@ -1014,7 +1015,8 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn, * which will set the page count to 1 when allocating the page. */ if (pgmap->type == MEMORY_DEVICE_PRIVATE || - pgmap->type == MEMORY_DEVICE_COHERENT) + pgmap->type == MEMORY_DEVICE_COHERENT || + pgmap->type == MEMORY_DEVICE_PCI_P2PDMA) set_page_count(page, 0); }