[GHC] #11566: I don't need madvise DONT_NEED

[GHC]

#11566: I don't need madvise DONT_NEED
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           Reporter:  mfox           |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Linux
       Architecture:  aarch64        |   Type of failure:  Incorrect
                                     |  warning at compile-time
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Many tests fail because of a warning in rts/posix/OSMem.c

     unable to decommit memory: function not implemented

 The reason it says "function not implemented" is that the function
 madvise(..., DONT_NEED) is not implemented.

 This is on a stock Ubuntu LTS 14.04 machine. The only interesting thing
 about it is that it's running on a pre-production armv8 processor with a
 beta 4.2 guest kernel.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11566>
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