[PATCH v2 1/3] mm/memremap: Rename and consolidate SECTION_SIZE

[Robin Murphy]

Trying to activate ZONE_DEVICE for arm64 reveals that memremap's
internal helpers for sparsemem sections conflict with and arm64's
definitions for hugepages, which inherit the name of "sections" from
earlier versions of the ARM architecture.

Disambiguate memremap (and now HMM too) by propagating sparsemem's PA_
prefix, to clarify that these values are in terms of addresses rather
than PFNs (and because it's a heck of a lot easier than changing all the
arch code). SECTION_MASK is unused, so it can just go.

[anshuman: Consolidated mm/hmm.c instance and updated the commit message]

Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---

v2: Fix commit message typo, add review tags.

 include/linux/mmzone.h |  1 +
 kernel/memremap.c      | 10 ++++------
 mm/hmm.c               |  2 --
 3 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index fba7741533be..ed7dd27ee94a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1081,6 +1081,7 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn)
  * PFN_SECTION_SHIFT		pfn to/from section number
  */
 #define PA_SECTION_SHIFT	(SECTION_SIZE_BITS)
+#define PA_SECTION_SIZE		(1UL << PA_SECTION_SHIFT)
 #define PFN_SECTION_SHIFT	(SECTION_SIZE_BITS - PAGE_SHIFT)
 
 #define NR_MEM_SECTIONS		(1UL << SECTIONS_SHIFT)
diff --git a/kernel/memremap.c b/kernel/memremap.c
index a856cb5ff192..dda1367b385d 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -14,8 +14,6 @@
 #include <linux/hmm.h>
 
 static DEFINE_XARRAY(pgmap_array);
-#define SECTION_MASK ~((1UL << PA_SECTION_SHIFT) - 1)
-#define SECTION_SIZE (1UL << PA_SECTION_SHIFT)
 
 #if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
 vm_fault_t device_private_entry_fault(struct vm_area_struct *vma,
@@ -98,8 +96,8 @@ static void devm_memremap_pages_release(void *data)
 		put_page(pfn_to_page(pfn));
 
 	/* pages are dead and unused, undo the arch mapping */
-	align_start = res->start & ~(SECTION_SIZE - 1);
-	align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
+	align_start = res->start & ~(PA_SECTION_SIZE - 1);
+	align_size = ALIGN(res->start + resource_size(res), PA_SECTION_SIZE)
 		- align_start;
 
 	nid = page_to_nid(pfn_to_page(align_start >> PAGE_SHIFT));
@@ -154,8 +152,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
 	if (!pgmap->ref || !pgmap->kill)
 		return ERR_PTR(-EINVAL);
 
-	align_start = res->start & ~(SECTION_SIZE - 1);
-	align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
+	align_start = res->start & ~(PA_SECTION_SIZE - 1);
+	align_size = ALIGN(res->start + resource_size(res), PA_SECTION_SIZE)
 		- align_start;
 	align_end = align_start + align_size - 1;
 
diff --git a/mm/hmm.c b/mm/hmm.c
index fe1cd87e49ac..ef9e4e6c9f92 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -33,8 +33,6 @@
 #include <linux/mmu_notifier.h>
 #include <linux/memory_hotplug.h>
 
-#define PA_SECTION_SIZE (1UL << PA_SECTION_SHIFT)
-
 #if IS_ENABLED(CONFIG_HMM_MIRROR)
 static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
 
-- 
2.21.0.dirty