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      mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions · 90f72aa5
      Arnd Bergmann 提交于
      Add a flag for mmap that will be used to request a huge page region that
      will look like anonymous memory to user space.  This is accomplished by
      using a file on the internal vfsmount.  MAP_HUGETLB is a modifier of
      MAP_ANONYMOUS and so must be specified with it.  The region will behave
      the same as a MAP_ANONYMOUS region using small pages.
      
      The patch also adds the MAP_STACK flag, which was previously defined only
      on some architectures but not on others.  Since MAP_STACK is meant to be a
      hint only, architectures can define it without assigning a specific
      meaning to it.
      Signed-off-by: NArnd Bergmann <arnd@arndb.de>
      Cc: Eric B Munson <ebmunson@us.ibm.com>
      Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
      Cc: David Rientjes <rientjes@google.com>
      Cc: <linux-arch@vger.kernel.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      90f72aa5
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