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memremap: remove support for external pgmap refcounts

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No driver is left using the external pgmap refcount, so remove the
code to support it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211028151017.50234-1-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig
2021-10-28 17:10:17 +02:00
committed by Dan Williams
parent b842f1d14a
commit b80892ca02
4 changed files with 26 additions and 92 deletions
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18
include/linux/memremap.h
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@@ -72,16 +72,6 @@ struct dev_pagemap_ops {
*/
void (*page_free)(struct page *page);
/*
* Transition the refcount in struct dev_pagemap to the dead state.
*/
void (*kill)(struct dev_pagemap *pgmap);
/*
* Wait for refcount in struct dev_pagemap to be idle and reap it.
*/
void (*cleanup)(struct dev_pagemap *pgmap);
/*
* Used for private (un-addressable) device memory only. Must migrate
* the page back to a CPU accessible page.
@@ -95,8 +85,7 @@ struct dev_pagemap_ops {
* struct dev_pagemap - metadata for ZONE_DEVICE mappings
* @altmap: pre-allocated/reserved memory for vmemmap allocations
* @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
* @done: completion for @ref
* @type: memory type: see MEMORY_* in memory_hotplug.h
* @flags: PGMAP_* flags to specify defailed behavior
* @ops: method table
@@ -109,8 +98,7 @@ struct dev_pagemap_ops {
*/
struct dev_pagemap {
struct vmem_altmap altmap;
struct percpu_ref *ref;
struct percpu_ref internal_ref;
struct percpu_ref ref;
struct completion done;
enum memory_type type;
unsigned int flags;
@@ -191,7 +179,7 @@ static inline unsigned long memremap_compat_align(void)
static inline void put_dev_pagemap(struct dev_pagemap *pgmap)
{
if (pgmap)
percpu_ref_put(pgmap->ref);
percpu_ref_put(&pgmap->ref);
}
#endif /* _LINUX_MEMREMAP_H_ */