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authorChristoph Hellwig <hch@lst.de>2017-12-29 10:54:00 +0300
committerDan Williams <dan.j.williams@intel.com>2018-01-08 22:46:23 +0300
commit0822acb86cf340cd45b3af6436cec7e3bb24ebd2 (patch)
treec6faf43ac3d78e1bd91334e9e94feb7d6b939c30 /include/linux/memremap.h
parenteb8045335c70ef8b272d2888a225b81344423139 (diff)
downloadlinux-0822acb86cf340cd45b3af6436cec7e3bb24ebd2.tar.xz
mm: move get_dev_pagemap out of line
This is a pretty big function, which should be out of line in general, and a no-op stub if CONFIG_ZONE_DEVICЕ is not set. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/memremap.h')
-rw-r--r--include/linux/memremap.h39
1 files changed, 4 insertions, 35 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index d5a6736d9737..26e8aaba27d5 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -133,7 +133,8 @@ struct dev_pagemap {
#ifdef CONFIG_ZONE_DEVICE
void *devm_memremap_pages(struct device *dev, struct resource *res,
struct percpu_ref *ref, struct vmem_altmap *altmap);
-struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
+struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
+ struct dev_pagemap *pgmap);
unsigned long vmem_altmap_offset(struct vmem_altmap *altmap);
void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
@@ -153,7 +154,8 @@ static inline void *devm_memremap_pages(struct device *dev,
return ERR_PTR(-ENXIO);
}
-static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
+static inline struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
+ struct dev_pagemap *pgmap)
{
return NULL;
}
@@ -183,39 +185,6 @@ static inline bool is_device_public_page(const struct page *page)
}
#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-/**
- * get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn
- * @pfn: page frame number to lookup page_map
- * @pgmap: optional known pgmap that already has a reference
- *
- * @pgmap allows the overhead of a lookup to be bypassed when @pfn lands in the
- * same mapping.
- */
-static inline struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
- struct dev_pagemap *pgmap)
-{
- const struct resource *res = pgmap ? pgmap->res : NULL;
- resource_size_t phys = PFN_PHYS(pfn);
-
- /*
- * In the cached case we're already holding a live reference so
- * we can simply do a blind increment
- */
- if (res && phys >= res->start && phys <= res->end) {
- percpu_ref_get(pgmap->ref);
- return pgmap;
- }
-
- /* fall back to slow path lookup */
- rcu_read_lock();
- pgmap = find_dev_pagemap(phys);
- if (pgmap && !percpu_ref_tryget_live(pgmap->ref))
- pgmap = NULL;
- rcu_read_unlock();
-
- return pgmap;
-}
-
static inline void put_dev_pagemap(struct dev_pagemap *pgmap)
{
if (pgmap)