[PATCH v3 02/27] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers
From: Alastair D'Silva <hidden>
Date: 2020-02-21 03:28:20
Also in:
linux-mm, lkml, nvdimm
Subsystem:
memory hot(un)plug, memory management, the rest · Maintainers:
David Hildenbrand, Oscar Salvador, Andrew Morton, Linus Torvalds
From: Alastair D'Silva <redacted> 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 SCM device. Signed-off-by: Alastair D'Silva <redacted> --- 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..34a69aecc45e 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