diff options
Diffstat (limited to 'include/linux/memremap.h')
| -rw-r--r-- | include/linux/memremap.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 6fefb09af7c3..5f5b2df06e61 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -98,11 +98,12 @@ struct dev_pagemap_ops { * @ref: reference count that pins the devm_memremap_pages() mapping * @internal_ref: internal reference if @ref is not provided by the caller * @done: completion for @internal_ref - * @dev: host device of the mapping for debug - * @data: private data pointer for page_free() * @type: memory type: see MEMORY_* in memory_hotplug.h * @flags: PGMAP_* flags to specify defailed behavior * @ops: method table + * @owner: an opaque pointer identifying the entity that manages this + * instance. Used by various helpers to make sure that no + * foreign ZONE_DEVICE memory is accessed. */ struct dev_pagemap { struct vmem_altmap altmap; @@ -113,6 +114,7 @@ struct dev_pagemap { enum memory_type type; unsigned int flags; const struct dev_pagemap_ops *ops; + void *owner; }; static inline struct vmem_altmap *pgmap_altmap(struct dev_pagemap *pgmap) @@ -132,6 +134,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, unsigned long vmem_altmap_offset(struct vmem_altmap *altmap); void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns); +unsigned long memremap_compat_align(void); #else static inline void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) @@ -165,6 +168,12 @@ static inline void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns) { } + +/* when memremap_pages() is disabled all archs can remap a single page */ +static inline unsigned long memremap_compat_align(void) +{ + return PAGE_SIZE; +} #endif /* CONFIG_ZONE_DEVICE */ static inline void put_dev_pagemap(struct dev_pagemap *pgmap) @@ -172,4 +181,5 @@ static inline void put_dev_pagemap(struct dev_pagemap *pgmap) if (pgmap) percpu_ref_put(pgmap->ref); } + #endif /* _LINUX_MEMREMAP_H_ */ |