Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* finish atomics revamp
* meson.build tweaks
* revert avocado update
* always upgrade/downgrade locally installed Python packages
* switch from submodules to subprojects
* remove --with-git= option
* rename --enable-pypi to --enable-download, control submodules and subprojects too

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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (21 commits)
  configure: remove --with-git-submodules=
  build: remove git submodule handling from main makefile
  meson: subprojects: replace berkeley-{soft,test}float-3 with wraps
  pc-bios/s390-ccw: always build network bootloader
  configure: move SLOF submodule handling to pc-bios/s390-ccw
  meson: subprojects: replace submodules with wrap files
  build: log submodule update from git-submodule.sh
  git-submodule: allow partial update of .git-submodule-status
  configure: rename --enable-pypi to --enable-download, control subprojects too
  configure: remove --with-git= option
  mkvenv: always pass locally-installed packages to pip
  tests: Use separate virtual environment for avocado
  Revert "tests/requirements.txt: bump up avocado-framework version to 101.0"
  scsi/qemu-pr-helper: Drop support for 'old' libmultipath API
  meson.build: Use -Wno-undef only for SDL2 versions that need it
  meson.build: Group the audio backend entries in a separate summary section
  meson.build: Group the network backend entries in a separate summary section
  meson.build: Group the UI entries in a separate summary section
  scripts: remove dead file
  atomics: eliminate mb_read/mb_set
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 5 insertions, 12 deletions

diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h
index f85834ee8b..d95612f7a0 100644
--- a/include/qemu/atomic.h
+++ b/include/qemu/atomic.h
@@ -259,24 +259,17 @@
 # define smp_mb__after_rmw() smp_mb()
 #endif
 
-/* qatomic_mb_read/set semantics map Java volatile variables. They are
- * less expensive on some platforms (notably POWER) than fully
- * sequentially consistent operations.
- *
- * As long as they are used as paired operations they are safe to
- * use. See docs/devel/atomics.rst for more discussion.
+/*
+ * On some architectures, qatomic_set_mb is more efficient than a store
+ * plus a fence.
  */
 
-#define qatomic_mb_read(ptr)                             \
-    qatomic_load_acquire(ptr)
-
 #if !defined(QEMU_SANITIZE_THREAD) && \
     (defined(__i386__) || defined(__x86_64__) || defined(__s390x__))
-/* This is more efficient than a store plus a fence.  */
-# define qatomic_mb_set(ptr, i) \
+# define qatomic_set_mb(ptr, i) \
     ({ (void)qatomic_xchg(ptr, i); smp_mb__after_rmw(); })
 #else
-# define qatomic_mb_set(ptr, i) \
+# define qatomic_set_mb(ptr, i) \
    ({ qatomic_store_release(ptr, i); smp_mb(); })
 #endif