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Subject[PATCH v4 02/25] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers
Date
When setting up OpenCAPI connected persistent memory, the range check may
not be performed until quite late (or perhaps not at all, if the user does
not establish a DAX device).

This patch makes the range check callable so we can perform the check while
probing the OpenCAPI Persistent Memory device.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
---
include/linux/memory_hotplug.h | 5 +++++
mm/memory_hotplug.c | 4 ++--
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index f4d59155f3d4..9a19ae0d7e31 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -337,6 +337,11 @@ static inline void __remove_memory(int nid, u64 start, u64 size) {}
extern void set_zone_contiguous(struct zone *zone);
extern void clear_zone_contiguous(struct zone *zone);

+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+int check_hotplug_memory_addressable(unsigned long pfn,
+ unsigned long nr_pages);
+#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
+
extern void __ref free_area_init_core_hotplug(int nid);
extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0a54ffac8c68..14945f033594 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -276,8 +276,8 @@ static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
return 0;
}

-static int check_hotplug_memory_addressable(unsigned long pfn,
- unsigned long nr_pages)
+int check_hotplug_memory_addressable(unsigned long pfn,
+ unsigned long nr_pages)
{
const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;

--
2.24.1
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