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authorChristoph Hellwig <hch@lst.de>2021-10-28 17:10:17 +0200
committerDan Williams <dan.j.williams@intel.com>2021-12-04 12:46:09 -0800
commitb80892ca022e9eb484771a66eb68e12364695a2a (patch)
treecf885643ff4806d0abacd90d2572a25621eefe80 /mm/memremap.c
parentb842f1d14a190e217a8ee3f6dae9e1dff1817d87 (diff)
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memremap: remove support for external pgmap refcounts
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>
Diffstat (limited to 'mm/memremap.c')
-rw-r--r--mm/memremap.c59
1 files changed, 12 insertions, 47 deletions
diff --git a/mm/memremap.c b/mm/memremap.c
index 5a66a71ab591..643965da13a6 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -112,30 +112,6 @@ static unsigned long pfn_next(unsigned long pfn)
#define for_each_device_pfn(pfn, map, i) \
for (pfn = pfn_first(map, i); pfn < pfn_end(map, i); pfn = pfn_next(pfn))
-static void dev_pagemap_kill(struct dev_pagemap *pgmap)
-{
- if (pgmap->ops && pgmap->ops->kill)
- pgmap->ops->kill(pgmap);
- else
- percpu_ref_kill(pgmap->ref);
-}
-
-static void dev_pagemap_cleanup(struct dev_pagemap *pgmap)
-{
- if (pgmap->ops && pgmap->ops->cleanup) {
- pgmap->ops->cleanup(pgmap);
- } else {
- wait_for_completion(&pgmap->done);
- percpu_ref_exit(pgmap->ref);
- }
- /*
- * Undo the pgmap ref assignment for the internal case as the
- * caller may re-enable the same pgmap.
- */
- if (pgmap->ref == &pgmap->internal_ref)
- pgmap->ref = NULL;
-}
-
static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
{
struct range *range = &pgmap->ranges[range_id];
@@ -167,11 +143,12 @@ void memunmap_pages(struct dev_pagemap *pgmap)
unsigned long pfn;
int i;
- dev_pagemap_kill(pgmap);
+ percpu_ref_kill(&pgmap->ref);
for (i = 0; i < pgmap->nr_range; i++)
for_each_device_pfn(pfn, pgmap, i)
put_page(pfn_to_page(pfn));
- dev_pagemap_cleanup(pgmap);
+ wait_for_completion(&pgmap->done);
+ percpu_ref_exit(&pgmap->ref);
for (i = 0; i < pgmap->nr_range; i++)
pageunmap_range(pgmap, i);
@@ -188,8 +165,7 @@ static void devm_memremap_pages_release(void *data)
static void dev_pagemap_percpu_release(struct percpu_ref *ref)
{
- struct dev_pagemap *pgmap =
- container_of(ref, struct dev_pagemap, internal_ref);
+ struct dev_pagemap *pgmap = container_of(ref, struct dev_pagemap, ref);
complete(&pgmap->done);
}
@@ -295,8 +271,8 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
memmap_init_zone_device(&NODE_DATA(nid)->node_zones[ZONE_DEVICE],
PHYS_PFN(range->start),
PHYS_PFN(range_len(range)), pgmap);
- percpu_ref_get_many(pgmap->ref, pfn_end(pgmap, range_id)
- - pfn_first(pgmap, range_id));
+ percpu_ref_get_many(&pgmap->ref,
+ pfn_end(pgmap, range_id) - pfn_first(pgmap, range_id));
return 0;
err_add_memory:
@@ -362,22 +338,11 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
break;
}
- if (!pgmap->ref) {
- if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup))
- return ERR_PTR(-EINVAL);
-
- init_completion(&pgmap->done);
- error = percpu_ref_init(&pgmap->internal_ref,
- dev_pagemap_percpu_release, 0, GFP_KERNEL);
- if (error)
- return ERR_PTR(error);
- pgmap->ref = &pgmap->internal_ref;
- } else {
- if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) {
- WARN(1, "Missing reference count teardown definition\n");
- return ERR_PTR(-EINVAL);
- }
- }
+ init_completion(&pgmap->done);
+ error = percpu_ref_init(&pgmap->ref, dev_pagemap_percpu_release, 0,
+ GFP_KERNEL);
+ if (error)
+ return ERR_PTR(error);
devmap_managed_enable_get(pgmap);
@@ -486,7 +451,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
/* fall back to slow path lookup */
rcu_read_lock();
pgmap = xa_load(&pgmap_array, PHYS_PFN(phys));
- if (pgmap && !percpu_ref_tryget_live(pgmap->ref))
+ if (pgmap && !percpu_ref_tryget_live(&pgmap->ref))
pgmap = NULL;
rcu_read_unlock();