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    mm/memory_hotplug: introduce add_pages · 3072e413
    Michal Hocko authored
    There are new users of memory hotplug emerging.  Some of them require
    different subset of arch_add_memory.  There are some which only require
    allocation of struct pages without mapping those pages to the kernel
    address space.  We currently have __add_pages for that purpose.  But this
    is rather lowlevel and not very suitable for the code outside of the
    memory hotplug.  E.g.  x86_64 wants to update max_pfn which should be done
    by the caller.  Introduce add_pages() which should care about those
    details if they are needed.  Each architecture should define its
    implementation and select CONFIG_ARCH_HAS_ADD_PAGES.  All others use the
    currently existing __add_pages.
    
    Link: http://lkml.kernel.org/r/20170817000548.32038-7-jglisse@redhat.com
    
    
    Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
    Signed-off-by: default avatarJérôme Glisse <jglisse@redhat.com>
    Acked-by: default avatarBalbir Singh <bsingharora@gmail.com>
    Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: David Nellans <dnellans@nvidia.com>
    Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: John Hubbard <jhubbard@nvidia.com>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Mark Hairgrove <mhairgrove@nvidia.com>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
    Cc: Sherry Cheung <SCheung@nvidia.com>
    Cc: Subhash Gutti <sgutti@nvidia.com>
    Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
    Cc: Bob Liu <liubo95@huawei.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    3072e413