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, 3 insertions, 3 deletions

diff --git a/include/qemu/log.h b/include/qemu/log.h
index f4724f7330..9b80660207 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -36,7 +36,7 @@ static inline bool qemu_log_separate(void)
     bool res = false;
 
     rcu_read_lock();
-    logfile = atomic_rcu_read(&qemu_logfile);
+    logfile = qatomic_rcu_read(&qemu_logfile);
     if (logfile && logfile->fd != stderr) {
         res = true;
     }
@@ -75,7 +75,7 @@ static inline FILE *qemu_log_lock(void)
 {
     QemuLogFile *logfile;
     rcu_read_lock();
-    logfile = atomic_rcu_read(&qemu_logfile);
+    logfile = qatomic_rcu_read(&qemu_logfile);
     if (logfile) {
         qemu_flockfile(logfile->fd);
         return logfile->fd;
@@ -102,7 +102,7 @@ qemu_log_vprintf(const char *fmt, va_list va)
     QemuLogFile *logfile;
 
     rcu_read_lock();
-    logfile = atomic_rcu_read(&qemu_logfile);
+    logfile = qatomic_rcu_read(&qemu_logfile);
     if (logfile) {
         vfprintf(logfile->fd, fmt, va);
     }