The patch titled
Subject: mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns
has been added to the -mm tree. Its filename is
mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns
walk_memory_range() was once used to iterate over sections. Now, it
iterates over memory blocks. Rename the function, fixup the
documentation. Also, pass start+size instead of PFNs, which is what most
callers already have at hand. (we'll rework link_mem_sections() most
probably soon)
Follow-up patches will rework, simplify, and move walk_memory_blocks() to
drivers/base/memory.c.
Note: walk_memory_blocks() only works correctly right now if the start_pfn
is aligned to a section start. This is the case right now, but we'll
generalize the function in a follow up patch so the semantics match the
documentation.
Link: http://lkml.kernel.org/r/20190614100114.311-5-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Rashmica Gupta <rashmica.g@xxxxxxxxx>
Cc: Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/powernv/memtrace.c | 22 +++++++++---------
drivers/acpi/acpi_memhotplug.c | 19 +++------------
drivers/base/node.c | 5 ++--
include/linux/memory_hotplug.h | 2 -
mm/memory_hotplug.c | 24 ++++++++++----------
5 files changed, 32 insertions(+), 40 deletions(-)
--- a/arch/powerpc/platforms/powernv/memtrace.c~mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns
+++ a/arch/powerpc/platforms/powernv/memtrace.c
@@ -70,23 +70,24 @@ static int change_memblock_state(struct
/* called with device_hotplug_lock held */
static bool memtrace_offline_pages(u32 nid, u64 start_pfn, u64 nr_pages)
{
+ const unsigned long start = PFN_PHYS(start_pfn);
+ const unsigned long size = PFN_PHYS(nr_pages);
u64 end_pfn = start_pfn + nr_pages - 1;
- if (walk_memory_range(start_pfn, end_pfn, NULL,
- check_memblock_online))
+ if (walk_memory_blocks(start, size, NULL, check_memblock_online))
return false;
- walk_memory_range(start_pfn, end_pfn, (void *)MEM_GOING_OFFLINE,
- change_memblock_state);
+ walk_memory_blocks(start, size, (void *)MEM_GOING_OFFLINE,
+ change_memblock_state);
if (offline_pages(start_pfn, nr_pages)) {
- walk_memory_range(start_pfn, end_pfn, (void *)MEM_ONLINE,
- change_memblock_state);
+ walk_memory_blocks(start, size, (void *)MEM_ONLINE,
+ change_memblock_state);
return false;
}
- walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE,
- change_memblock_state);
+ walk_memory_blocks(start, size, (void *)MEM_OFFLINE,
+ change_memblock_state);
return true;
@@ -242,9 +243,8 @@ static int memtrace_online(void)
*/
if (!memhp_auto_online) {
lock_device_hotplug();
- walk_memory_range(PFN_DOWN(ent->start),
- PFN_UP(ent->start + ent->size - 1),
- NULL, online_mem_block);
+ walk_memory_blocks(ent->start, ent->size, NULL,
+ online_mem_block);
unlock_device_hotplug();
}
--- a/drivers/acpi/acpi_memhotplug.c~mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns
+++ a/drivers/acpi/acpi_memhotplug.c
@@ -155,16 +155,6 @@ static int acpi_memory_check_device(stru
return 0;
}
-static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
-{
- return PFN_DOWN(info->start_addr);
-}
-
-static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
-{
- return PFN_UP(info->start_addr + info->length-1);
-}
-
static int acpi_bind_memblk(struct memory_block *mem, void *arg)
{
return acpi_bind_one(&mem->dev, arg);
@@ -173,9 +163,8 @@ static int acpi_bind_memblk(struct memor
static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
struct acpi_device *adev)
{
- return walk_memory_range(acpi_meminfo_start_pfn(info),
- acpi_meminfo_end_pfn(info), adev,
- acpi_bind_memblk);
+ return walk_memory_blocks(info->start_addr, info->length, adev,
+ acpi_bind_memblk);
}
static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
@@ -186,8 +175,8 @@ static int acpi_unbind_memblk(struct mem
static void acpi_unbind_memory_blocks(struct acpi_memory_info *info)
{
- walk_memory_range(acpi_meminfo_start_pfn(info),
- acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
+ walk_memory_blocks(info->start_addr, info->length, NULL,
+ acpi_unbind_memblk);
}
static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
--- a/drivers/base/node.c~mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns
+++ a/drivers/base/node.c
@@ -833,8 +833,9 @@ void unregister_memory_block_under_nodes
int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
{
- return walk_memory_range(start_pfn, end_pfn, (void *)&nid,
- register_mem_sect_under_node);
+ return walk_memory_blocks(PFN_PHYS(start_pfn),
+ PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
+ register_mem_sect_under_node);
}
#ifdef CONFIG_HUGETLBFS
--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns
+++ a/include/linux/memory_hotplug.h
@@ -340,7 +340,7 @@ 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_range(unsigned long start_pfn, unsigned long end_pfn,
+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);
--- a/mm/memory_hotplug.c~mm-memory_hotplug-rename-walk_memory_range-and-pass-startsize-instead-of-pfns
+++ a/mm/memory_hotplug.c
@@ -1126,8 +1126,7 @@ int __ref add_memory_resource(int nid, s
/* online pages if requested */
if (memhp_auto_online)
- walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1),
- NULL, online_memory_block);
+ walk_memory_blocks(start, size, NULL, online_memory_block);
return ret;
error:
@@ -1665,20 +1664,24 @@ int offline_pages(unsigned long start_pf
#endif /* CONFIG_MEMORY_HOTREMOVE */
/**
- * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
- * @start_pfn: start pfn of the memory range
- * @end_pfn: end pfn of the memory range
+ * 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
+ * @func: callback for each memory block walked
*
- * This function walks through all present mem sections in range
- * [start_pfn, end_pfn) and call func on each mem section.
+ * 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_range(unsigned long start_pfn, unsigned long end_pfn,
+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;
@@ -1824,8 +1827,7 @@ static int __ref try_remove_memory(int n
* whether all memory blocks in question are offline and return error
* if this is not the case.
*/
- rc = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
- check_memblock_offlined_cb);
+ rc = walk_memory_blocks(start, size, NULL, check_memblock_offlined_cb);
if (rc)
goto done;
_
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
