This is v2 of the ThreadSanitizer fixes. Changes from the last

  - added Marc-André's review tags
  - added qga/command: use QEMU atomic primitives
  - simplified ui/vnc-enc-tight: remove switch and have single return
  - fixed the Travis CI build (that was painful....)

There is still some work to do to go through and fix warnings from the
sanitizer. Notably "make check" doesn't complete and generates a load
of warnings and I haven't investigated the warnings generated by

With this series applied you can enable ThreadSanitizer with the
following command line:

  ./configure --extra-cflags="-g3 -O0 \
    -fsantize=thread \
    -fsanitize-blacklist=/home/alex/lsrc/qemu/qemu.git/blacklist.tsan" \
    --with-coroutine=gthread --disable-pie --enable-debug --enable-debug-info

  -fsanitize=thread - enables sanitizer
  -fsanitize-blacklist - skip things the compiler finds hard, like SSE
  --with-coroutine=gthread - tsan chokes on other forms of coroutine
  --disable-pie - tsan no longer works with PIE
  --enable-debug --enable-debug-info - better backtraces

Alex Bennée (8):
  ui/vnc-enc-tight: remove switch and have single return
  tcg/optimize: move default return out of if statement
  new: blacklist.tsan
  qom/object: update class cache atomically
  cpu: atomically modify cpu->exit_request
  util/qht: atomically set b->hashes
  qga/command: use QEMU atomic primitives
  .travis.yml: add gcc sanitizer build

Paolo Bonzini (1):
  seqlock: use atomic writes for the sequence

 .travis.yml            | 45 +++++++++++++++++++++++++++++++++++++++++++++
 blacklist.tsan         |  2 ++
 cpu-exec.c             |  8 ++++----
 include/qemu/seqlock.h |  4 ++--
 qga/commands.c         | 17 +++++++++--------
 qom/cpu.c              |  4 ++--
 qom/object.c           | 15 ++++++++-------
 tcg/optimize.c         |  3 +--
 ui/vnc-enc-tight.c     |  6 ++----
 util/qht.c             | 10 +++++-----
 10 files changed, 80 insertions(+), 34 deletions(-)
 create mode 100644 blacklist.tsan


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