The patch titled
Subject: mm: skip memory block registration for ZONE_DEVICE
has been removed from the -mm tree. Its filename was
mm-skip-memory-block-registration-for-zone_device.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm: skip memory block registration for ZONE_DEVICE
Prevent userspace from trying and failing to online ZONE_DEVICE pages
which are meant to never be onlined.
For example on platforms with a udev rule like the following:
SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online"
...will generate futile attempts to online the ZONE_DEVICE sections.
Example kernel messages:
Built 1 zonelists in Node order, mobility grouping on. Total pages: 1004747
Policy zone: Normal
online_pages [mem 0x248000000-0x24fffffff] failed
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/memory.c | 13 +++++++++++++
include/linux/mm.h | 12 ++++++++++++
2 files changed, 25 insertions(+)
diff -puN drivers/base/memory.c~mm-skip-memory-block-registration-for-zone_device drivers/base/memory.c
--- a/drivers/base/memory.c~mm-skip-memory-block-registration-for-zone_device
+++ a/drivers/base/memory.c
@@ -647,6 +647,13 @@ static int add_memory_block(int base_sec
return 0;
}
+static bool is_zone_device_section(struct mem_section *ms)
+{
+ struct page *page;
+
+ page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
+ return is_zone_device_page(page);
+}
/*
* need an interface for the VM to add new memory regions,
@@ -657,6 +664,9 @@ int register_new_memory(int nid, struct
int ret = 0;
struct memory_block *mem;
+ if (is_zone_device_section(section))
+ return 0;
+
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
@@ -693,6 +703,9 @@ static int remove_memory_section(unsigne
{
struct memory_block *mem;
+ if (is_zone_device_section(section))
+ return 0;
+
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
unregister_mem_sect_under_nodes(mem, __section_nr(section));
diff -puN include/linux/mm.h~mm-skip-memory-block-registration-for-zone_device include/linux/mm.h
--- a/include/linux/mm.h~mm-skip-memory-block-registration-for-zone_device
+++ a/include/linux/mm.h
@@ -674,6 +674,18 @@ static inline enum zone_type page_zonenu
return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
}
+#ifdef CONFIG_ZONE_DEVICE
+static inline bool is_zone_device_page(const struct page *page)
+{
+ return page_zonenum(page) == ZONE_DEVICE;
+}
+#else
+static inline bool is_zone_device_page(const struct page *page)
+{
+ return false;
+}
+#endif
+
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
#define SECTION_IN_PAGE_FLAGS
#endif
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
dax-add-support-for-fsync-sync-v6-fix.patch
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