The patch titled
Subject: mm/memory_hotplug: move and simplify walk_memory_blocks()
has been added to the -mm tree. Its filename is
mm-memory_hotplug-move-and-simplify-walk_memory_blocks.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-move-and-simplify-walk_memory_blocks.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-move-and-simplify-walk_memory_blocks.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: 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.
Link: http://lkml.kernel.org/r/20190614100114.311-6-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Andrew Banman <andrew.banman@xxxxxxx>
Cc: Mike Travis <mike.travis@xxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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(-)
--- a/drivers/base/memory.c~mm-memory_hotplug-move-and-simplify-walk_memory_blocks
+++ a/drivers/base/memory.c
@@ -44,6 +44,11 @@ static inline unsigned long pfn_to_block
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);
@@ -853,3 +858,40 @@ out:
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;
+
+ for (block_id = start_block_id; block_id <= end_block_id; block_id++) {
+ mem = find_memory_block_by_id(block_id, NULL);
+ if (!mem)
+ continue;
+
+ ret = func(mem, arg);
+ put_device(&mem->dev);
+ if (ret)
+ break;
+ }
+ return ret;
+}
--- a/include/linux/memory.h~mm-memory_hotplug-move-and-simplify-walk_memory_blocks
+++ a/include/linux/memory.h
@@ -119,6 +119,9 @@ extern int memory_isolate_notify(unsigne
extern struct memory_block *find_memory_block_hinted(struct mem_section *,
struct memory_block *);
extern struct memory_block *find_memory_block(struct mem_section *);
+typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
+extern int walk_memory_blocks(unsigned long start, unsigned long size,
+ void *arg, walk_memory_blocks_func_t func);
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-move-and-simplify-walk_memory_blocks
+++ a/include/linux/memory_hotplug.h
@@ -340,8 +340,6 @@ static inline void __remove_memory(int n
#endif /* CONFIG_MEMORY_HOTREMOVE */
extern void __ref free_area_init_core_hotplug(int nid);
-extern int walk_memory_blocks(unsigned long start, unsigned long size,
- void *arg, int (*func)(struct memory_block *, void *));
extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource);
--- a/mm/memory_hotplug.c~mm-memory_hotplug-move-and-simplify-walk_memory_blocks
+++ a/mm/memory_hotplug.c
@@ -1661,62 +1661,7 @@ int offline_pages(unsigned long start_pf
{
return __offline_pages(start_pfn, start_pfn + nr_pages);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
-/**
- * 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 block walked
- *
- * This function walks through all present memory blocks overlapped by the
- * range [start, start + size), calling func on each memory block.
- *
- * Returns the return value of func.
- */
-int walk_memory_blocks(unsigned long start, unsigned long size,
- void *arg, int (*func)(struct memory_block *, void *))
-{
- const unsigned long start_pfn = PFN_DOWN(start);
- const unsigned long end_pfn = PFN_UP(start + size - 1);
- struct memory_block *mem = NULL;
- struct mem_section *section;
- unsigned long pfn, section_nr;
- int ret;
-
- for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
- section_nr = pfn_to_section_nr(pfn);
- if (!present_section_nr(section_nr))
- continue;
-
- section = __nr_to_section(section_nr);
- /* same memblock? */
- if (mem)
- if ((section_nr >= mem->start_section_nr) &&
- (section_nr <= mem->end_section_nr))
- continue;
-
- mem = find_memory_block_hinted(section, mem);
- if (!mem)
- continue;
-
- ret = func(mem, arg);
- if (ret) {
- kobject_put(&mem->dev.kobj);
- return ret;
- }
- }
-
- if (mem)
- kobject_put(&mem->dev.kobj);
-
- return 0;
-}
-
-#ifdef CONFIG_MEMORY_HOTREMOVE
static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
{
int ret = !is_memblock_offlined(mem);
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-memory_hotplug-simplify-and-fix-check_hotplug_memory_range.patch
s390x-mm-fail-when-an-altmap-is-used-for-arch_add_memory.patch
s390x-mm-implement-arch_remove_memory.patch
arm64-mm-add-temporary-arch_remove_memory-implementation.patch
drivers-base-memory-pass-a-block_id-to-init_memory_block.patch
mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove.patch
mm-memory_hotplug-create-memory-block-devices-after-arch_add_memory.patch
mm-memory_hotplug-drop-mhp_memblock_api.patch
mm-memory_hotplug-remove-memory-block-devices-before-arch_remove_memory.patch
mm-memory_hotplug-make-unregister_memory_block_under_nodes-never-fail.patch
mm-memory_hotplug-remove-zone-parameter-from-sparse_remove_one_section.patch
mm-section-numbers-use-the-type-unsigned-long.patch
drivers-base-memory-use-unsigned-long-for-block-ids.patch
mm-make-register_mem_sect_under_node-static.patch
mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns.patch
mm-memory_hotplug-move-and-simplify-walk_memory_blocks.patch
drivers-base-memoryc-get-rid-of-find_memory_block_hinted.patch
