mm/memremap_pages: Introduce memremap_compat_align()

[platform/kernel/linux-rpi.git] / include / linux / memremap.h

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 6fefb09..8af1cbd 100644 (file)
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -132,6 +132,7 @@ 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 +166,12 @@ 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 +179,5 @@ static inline void put_dev_pagemap(struct dev_pagemap *pgmap)
        if (pgmap)
                percpu_ref_put(pgmap->ref);
 }
+
 #endif /* _LINUX_MEMREMAP_H_ */