Re: [PATCH v3 5/6] mm/memory_hotplug: Move and simplify walk_memory_blocks()

Let's move walk_memory_blocks() to the place where memory block logic
resides and simplify it. While at it, add a type for the callback function.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: David Hildenbrand <redacted>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <redacted>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Andrew Banman <redacted>
Cc: "mike.travis@hpe.com" <redacted>
Cc: Oscar Salvador <redacted>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Wei Yang <redacted>
Cc: Arun KS <redacted>
Cc: Qian Cai <redacted>
Signed-off-by: David Hildenbrand <redacted>
---
 drivers/base/memory.c          | 42 ++++++++++++++++++++++++++
 include/linux/memory.h         |  3 ++
 include/linux/memory_hotplug.h |  2 --
 mm/memory_hotplug.c            | 55 ----------------------------------
 4 files changed, 45 insertions(+), 57 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index c54e80fd25a8..0204384b4d1d 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c

@@ -44,6 +44,11 @@ static inline unsigned long pfn_to_block_id(unsigned long pfn)
 	return base_memory_block_id(pfn_to_section_nr(pfn));
 }
 
+static inline unsigned long phys_to_block_id(unsigned long phys)
+{
+	return pfn_to_block_id(PFN_DOWN(phys));
+}
+
 static int memory_subsys_online(struct device *dev);
 static int memory_subsys_offline(struct device *dev);
 

@@ -851,3 +856,40 @@ int __init memory_dev_init(void)
 		printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
 	return ret;
 }
+
+/**
+ * walk_memory_blocks - walk through all present memory blocks overlapped
+ *			by the range [start, start + size)
+ *
+ * @start: start address of the memory range
+ * @size: size of the memory range
+ * @arg: argument passed to func
+ * @func: callback for each memory section walked
+ *
+ * This function walks through all present memory blocks overlapped by the
+ * range [start, start + size), calling func on each memory block.
+ *
+ * In case func() returns an error, walking is aborted and the error is
+ * returned.
+ */
+int walk_memory_blocks(unsigned long start, unsigned long size,
+		       void *arg, walk_memory_blocks_func_t func)
+{
+	const unsigned long start_block_id = phys_to_block_id(start);
+	const unsigned long end_block_id = phys_to_block_id(start + size - 1);
+	struct memory_block *mem;
+	unsigned long block_id;
+	int ret = 0;