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Paolo Bonzini 3bbf572345 atomics: add explicit compiler fence in __atomic memory barriers 
__atomic_thread_fence does not include a compiler barrier; in the
C++11 memory model, fences take effect in combination with other
atomic operations.  GCC implements this by making __atomic_load and
__atomic_store access memory as if the pointer was volatile, and
leaves no trace whatsoever of acquire and release fences in the
compiler's intermediate representation.

In QEMU, we want memory barriers to act on all memory, but at the same
time we would like to use __atomic_thread_fence for portability reasons.
Add compiler barriers manually around the __atomic_thread_fence.

Message-Id: <1433334080-14912-1-git-send-email-pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-06-05 19:45:13 +02:00
..
acl.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
aes.h include/qemu/aes.h: Avoid conflicts with FreeBSD AES functions 2014-06-19 16:13:38 +01:00
atomic.h atomics: add explicit compiler fence in __atomic memory barriers 2015-06-05 19:45:13 +02:00
bitmap.h bitmap: add atomic test and clear 2015-06-05 17:10:00 +02:00
bitops.h bitmap: add atomic set functions 2015-06-05 17:10:00 +02:00
bswap.h cpu_ldst.h, cpu-all.h, bswap.h: Update documentation on ld/st accessors 2015-01-20 15:19:35 +00:00
compatfd.h util: Remove unused functions 2015-04-30 16:05:48 +03:00
compiler.h qemu/compiler: Define QEMU_ARTIFICIAL 2014-09-29 14:55:28 -04:00
config-file.h qemu-option: introduce qemu_find_opts_singleton 2014-04-27 13:04:18 +04:00
crc32c.h include/qemu/crc32c.h: Rename include guards to match filename 2014-02-26 17:20:07 +00:00
envlist.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
error-report.h qemu-error: Add error_vreport() 2014-10-09 15:36:15 +02:00
event_notifier.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
fifo8.h util/fifo8: implement push/pop of multiple bytes 2014-02-08 14:50:48 +00:00
hbitmap.h block: Resize bitmaps on bdrv_truncate 2015-04-28 15:36:10 +02:00
host-utils.h target-ppc: Add ISA2.06 divde[o] Instructions 2014-03-05 03:06:39 +01:00
int128.h int128: Add int128_exts64() 2014-05-30 13:00:28 -06:00
iov.h iov: add iov_discard_front/back() to remove data 2013-01-02 15:58:05 +01:00
log.h qemu-log: add log category for MMU info 2014-12-16 18:43:19 +00:00
main-loop.h async: aio_context_new(): Handle event_notifier_init failure 2014-09-22 11:39:48 +01:00
module.h module: implement module loading 2014-02-20 13:14:18 +01:00
notify.h notify: add NotiferWithReturn so notifier list can abort 2013-06-28 09:20:26 +02:00
option.h qemu-img: Suppress unhelpful extra errors in convert, amend 2015-02-26 14:51:21 +01:00
option_int.h QemuOpts: change opt->name|str from (const char *) to (char *) 2014-06-16 17:23:20 +08:00
osdep.h util: move read_password method out of qemu-img into osdep/oslib 2015-05-22 17:08:01 +02:00
queue.h queue: fix QSLIST_INSERT_HEAD_ATOMIC race 2015-03-12 17:41:23 +00:00
range.h Introduce signed range. 2014-06-19 18:44:19 +03:00
ratelimit.h aio / timers: Switch entire codebase to the new timer API 2013-08-22 19:14:24 +02:00
rcu.h rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
rcu_queue.h rcu: introduce RCU-enabled QLIST 2015-02-16 17:30:19 +01:00
readline.h readline: Add missing GCC_FMT_ATTR 2014-02-01 13:46:06 +04:00
rfifolock.h rfifolock: add recursive FIFO lock 2014-03-13 14:42:21 +01:00
seqlock.h seqlock: introduce read-write seqlock 2013-10-17 17:24:15 +02:00
sockets.h socket shutdown 2015-01-16 13:06:17 +05:30
thread-posix.h qemu-thread: add QemuEvent 2013-10-17 17:30:55 +02:00
thread-win32.h qemu-thread: add QemuEvent 2013-10-17 17:30:55 +02:00
thread.h rcu: add rcu library 2015-02-02 16:55:10 +01:00
throttle.h throttle: add throttle_detach/attach_aio_context() 2014-06-04 09:56:12 +02:00
timer.h profiler: Reenable built-in profiler 2015-03-18 12:07:34 +01:00
tls.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
typedefs.h Add device listener interface 2015-01-20 14:24:07 +00:00
uri.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
xattr.h misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00