[Qemu-commits] [qemu/qemu] 3b1d81: tests-aio-multithread: use atomic_read properly

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: 3b1d8169844fafee184366b0e0d7080534758b4d
      
https://github.com/qemu/qemu/commit/3b1d8169844fafee184366b0e0d7080534758b4d
  Author: Paolo Bonzini <address@hidden>
  Date:   2017-02-27 (Mon, 27 Feb 2017)

  Changed paths:
    M tests/test-aio-multithread.c

  Log Message:
  -----------
  tests-aio-multithread: use atomic_read properly

nodes[id].next is written by other threads.  If atomic_read is not used
(matching atomic_set in mcs_mutex_lock!) the compiler can optimize the
whole "if" away!

Reported-by: Alex Bennée <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Tested-by: Greg Kurz <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>