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| author | Dan Williams | 2016-01-16 01:56:17 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2016-01-16 02:56:32 +0100 |
| commit | 260ae3f7db614a5c4aa4b773599f99adc1d9859e (patch) | |
| tree | faeb0c28acb29ff347f9416ae207e739117cb9a0 /include/linux/mm.h | |
| parent | mm, dax, pmem: introduce pfn_t (diff) | |
| download | kernel-qcow2-linux-260ae3f7db614a5c4aa4b773599f99adc1d9859e.tar.gz kernel-qcow2-linux-260ae3f7db614a5c4aa4b773599f99adc1d9859e.tar.xz kernel-qcow2-linux-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 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 0ef5f21735af..d9fe12d45c21 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -674,6 +674,18 @@ static inline enum zone_type page_zonenum(const struct page *page) 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 |