drivers/base/memory.c: clean up relics in function parameters

The input parameter 'phys_index' of memory_block_action() is actually the
section number, but not the phys_index of memory_block.  This is a relic
from the past when one memory block could only contain one section.
Rename it to start_section_nr.

And also in remove_memory_section(), the 'node_id' and 'phys_device'
arguments are not used by anyone.  Remove them.

Link: http://lkml.kernel.org/r/20190329144250.14315-2-bhe@redhat.comSigned-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/base/memory.c

@@ -231,13 +231,14 @@ static bool pages_correctly_probed(unsigned long start_pfn)
  * OK to have direct references to sparsemem variables in here.
  */
 static int
-memory_block_action(unsigned long phys_index, unsigned long action, int online_type)
+memory_block_action(unsigned long start_section_nr, unsigned long action,
+		    int online_type)
 {
 	unsigned long start_pfn;
 	unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
 	int ret;
 
-	start_pfn = section_nr_to_pfn(phys_index);
+	start_pfn = section_nr_to_pfn(start_section_nr);
 
 	switch (action) {
 	case MEM_ONLINE:
@@ -251,7 +252,7 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t
 		break;
 	default:
 		WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
-		     "%ld\n", __func__, phys_index, action, action);
+		     "%ld\n", __func__, start_section_nr, action, action);
 		ret = -EINVAL;
 	}
 
@@ -738,8 +739,7 @@ unregister_memory(struct memory_block *memory)
 	device_unregister(&memory->dev);
 }
 
-static int remove_memory_section(unsigned long node_id,
-			       struct mem_section *section, int phys_device)
+static int remove_memory_section(struct mem_section *section)
 {
 	struct memory_block *mem;
 
@@ -771,7 +771,7 @@ int unregister_memory_section(struct mem_section *section)
 	if (!present_section(section))
 		return -EINVAL;
 
-	return remove_memory_section(0, section, 0);
+	return remove_memory_section(section);
 }
 #endif /* CONFIG_MEMORY_HOTREMOVE */