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, 2 insertions, 2 deletions

diff --git a/include/exec/tb-lookup.h b/include/exec/tb-lookup.h
index 26921b6daf..9cf475bb03 100644
--- a/include/exec/tb-lookup.h
+++ b/include/exec/tb-lookup.h
@@ -27,7 +27,7 @@ tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
 
     cpu_get_tb_cpu_state(env, pc, cs_base, flags);
     hash = tb_jmp_cache_hash_func(*pc);
-    tb = atomic_rcu_read(&cpu->tb_jmp_cache[hash]);
+    tb = qatomic_rcu_read(&cpu->tb_jmp_cache[hash]);
 
     cf_mask &= ~CF_CLUSTER_MASK;
     cf_mask |= cpu->cluster_index << CF_CLUSTER_SHIFT;
@@ -44,7 +44,7 @@ tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
     if (tb == NULL) {
         return NULL;
     }
-    atomic_set(&cpu->tb_jmp_cache[hash], tb);
+    qatomic_set(&cpu->tb_jmp_cache[hash], tb);
     return tb;
 }