qemu/atomic.h: rename atomic_ to qatomic_

clang's C11 atomic_fetch_*() functions only take a C11 atomic type
pointer argument. QEMU uses direct types (int, etc) and this causes a
compiler error when a QEMU code calls these functions in a source file
that also included <stdatomic.h> via a system header file:

  $ CC=clang CXX=clang++ ./configure ... && make
  ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid)

Avoid using atomic_*() names in QEMU's atomic.h since that namespace is
used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h
and <stdatomic.h> can co-exist. I checked /usr/include on my machine and
searched GitHub for existing "qatomic_" users but there seem to be none.

This patch was generated using:

  $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \
    sort -u >/tmp/changed_identifiers
  $ for identifier in $(</tmp/changed_identifiers); do
        sed -i "s%\<$identifier\>%q$identifier%g" \
            $(git grep -I -l "\<$identifier\>")
    done

I manually fixed line-wrap issues and misaligned rST tables.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923105646.47864-1-stefanha@redhat.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/util/log.c b/util/log.c
index bdb3d712e8..4b423062aa 100644
--- a/util/log.c
+++ b/util/log.c
@@ -41,7 +41,7 @@ int qemu_log(const char *fmt, ...)
     QemuLogFile *logfile;
 
     rcu_read_lock();
-    logfile = atomic_rcu_read(&qemu_logfile);
+    logfile = qatomic_rcu_read(&qemu_logfile);
     if (logfile) {
         va_list ap;
         va_start(ap, fmt);
@@ -98,7 +98,7 @@ void qemu_set_log(int log_flags)
     QEMU_LOCK_GUARD(&qemu_logfile_mutex);
     if (qemu_logfile && !need_to_open_file) {
         logfile = qemu_logfile;
-        atomic_rcu_set(&qemu_logfile, NULL);
+        qatomic_rcu_set(&qemu_logfile, NULL);
         call_rcu(logfile, qemu_logfile_free, rcu);
     } else if (!qemu_logfile && need_to_open_file) {
         logfile = g_new0(QemuLogFile, 1);
@@ -135,7 +135,7 @@ void qemu_set_log(int log_flags)
 #endif
             log_append = 1;
         }
-        atomic_rcu_set(&qemu_logfile, logfile);
+        qatomic_rcu_set(&qemu_logfile, logfile);
     }
 }
 
@@ -272,7 +272,7 @@ void qemu_log_flush(void)
     QemuLogFile *logfile;
 
     rcu_read_lock();
-    logfile = atomic_rcu_read(&qemu_logfile);
+    logfile = qatomic_rcu_read(&qemu_logfile);
     if (logfile) {
         fflush(logfile->fd);
     }
@@ -288,7 +288,7 @@ void qemu_log_close(void)
     logfile = qemu_logfile;
 
     if (logfile) {
-        atomic_rcu_set(&qemu_logfile, NULL);
+        qatomic_rcu_set(&qemu_logfile, NULL);
         call_rcu(logfile, qemu_logfile_free, rcu);
     }
     qemu_mutex_unlock(&qemu_logfile_mutex);