linux-kernel - [PATCH RFC v2 12/12] mm/memremap: Remove unused devmap_managed

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Message-ID: <7efe718b19363bfc1ccd75c558ba9e5fcd94fa0c.1739941374.git-series.apopple@nvidia.com>
Date: Wed, 19 Feb 2025 16:04:56 +1100
From: Alistair Popple <apopple@...dia.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: Alistair Popple <apopple@...dia.com>,
	gerald.schaefer@...ux.ibm.com,
	dan.j.williams@...el.com,
	jgg@...pe.ca,
	willy@...radead.org,
	david@...hat.com,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	jhubbard@...dia.com,
	hch@....de,
	zhang.lyra@...il.com,
	debug@...osinc.com,
	bjorn@...nel.org,
	balbirs@...dia.com
Subject: [PATCH RFC v2 12/12] mm/memremap: Remove unused devmap_managed_key

It's no longer used so remove it.

Signed-off-by: Alistair Popple <apopple@...dia.com>
---
 mm/memremap.c | 27 ---------------------------
 1 file changed, 27 deletions(-)

diff --git a/mm/memremap.c b/mm/memremap.c
index d875534..e40672b 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -38,30 +38,6 @@ unsigned long memremap_compat_align(void)
 EXPORT_SYMBOL_GPL(memremap_compat_align);
 #endif
 
-#ifdef CONFIG_FS_DAX
-DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
-EXPORT_SYMBOL(devmap_managed_key);
-
-static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
-{
-	if (pgmap->type == MEMORY_DEVICE_FS_DAX)
-		static_branch_dec(&devmap_managed_key);
-}
-
-static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
-{
-	if (pgmap->type == MEMORY_DEVICE_FS_DAX)
-		static_branch_inc(&devmap_managed_key);
-}
-#else
-static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
-{
-}
-static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
-{
-}
-#endif /* CONFIG_FS_DAX */
-
 static void pgmap_array_delete(struct range *range)
 {
 	xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end),
@@ -150,7 +126,6 @@ void memunmap_pages(struct dev_pagemap *pgmap)
 	percpu_ref_exit(&pgmap->ref);
 
 	WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n");
-	devmap_managed_enable_put(pgmap);
 }
 EXPORT_SYMBOL_GPL(memunmap_pages);
 
@@ -353,8 +328,6 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
 	if (error)
 		return ERR_PTR(error);
 
-	devmap_managed_enable_get(pgmap);
-
 	/*
 	 * Clear the pgmap nr_range as it will be incremented for each
 	 * successfully processed range. This communicates how many
-- 
git-series 0.9.1