__radix_tree_insert already checks for duplicates and returns -EEXIST in
that case, so remove the duplicate (and racy) duplicates check.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
kernel/memremap.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/kernel/memremap.c b/kernel/memremap.c
index f4b198304e3b..4301fb657150 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -379,17 +379,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
align_end = align_start + align_size - 1;
foreach_order_pgoff(res, order, pgoff) {
- struct dev_pagemap *dup;
-
- rcu_read_lock();
- dup = find_dev_pagemap(res->start + PFN_PHYS(pgoff));
- rcu_read_unlock();
- if (dup) {
- dev_err(dev, "%s: %pr collides with mapping for %s\n",
- __func__, res, dev_name(dup->dev));
- error = -EBUSY;
- break;
- }
error = __radix_tree_insert(&pgmap_radix,
PHYS_PFN(res->start) + pgoff, order, pgmap);
if (error) {
--
2.14.2
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