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| author |   Dan Williams <dan.j.williams@intel.com> | 2016-01-15 16:56:17 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | 260ae3f7db614a5c4aa4b773599f99adc1d9859e (patch) | |
| tree | faeb0c28acb29ff347f9416ae207e739117cb9a0 /drivers/base/memory.c | |
| parent | mm, dax, pmem: introduce pfn_t (diff) | |
| download | linux-dev-260ae3f7db614a5c4aa4b773599f99adc1d9859e.tar.xz linux-dev-260ae3f7db614a5c4aa4b773599f99adc1d9859e.zip | |
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@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/memory.c')
| -rw-r--r-- | drivers/base/memory.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 619fe584a44c..213456c2b123 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -647,6 +647,13 @@ static int add_memory_block(int base_section_nr) 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 mem_section *section) 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(unsigned long node_id, { 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)); |