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    mm: replace vma prio_tree with an interval tree · 6b2dbba8
    Michel Lespinasse authored
    
    
    Implement an interval tree as a replacement for the VMA prio_tree.  The
    algorithms are similar to lib/interval_tree.c; however that code can't be
    directly reused as the interval endpoints are not explicitly stored in the
    VMA.  So instead, the common algorithm is moved into a template and the
    details (node type, how to get interval endpoints from the node, etc) are
    filled in using the C preprocessor.
    
    Once the interval tree functions are available, using them as a
    replacement to the VMA prio tree is a relatively simple, mechanical job.
    
    Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Hillf Danton <dhillf@gmail.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    6b2dbba8