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, 6 insertions, 6 deletions

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index ad8b315..e4bbf78 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2379,7 +2379,7 @@ static __thread bool have_sigbus_pending;
 
 static void kvm_cpu_kick(CPUState *cpu)
 {
-    atomic_set(&cpu->kvm_run->immediate_exit, 1);
+    qatomic_set(&cpu->kvm_run->immediate_exit, 1);
 }
 
 static void kvm_cpu_kick_self(void)
@@ -2400,7 +2400,7 @@ static void kvm_eat_signals(CPUState *cpu)
     int r;
 
     if (kvm_immediate_exit) {
-        atomic_set(&cpu->kvm_run->immediate_exit, 0);
+        qatomic_set(&cpu->kvm_run->immediate_exit, 0);
         /* Write kvm_run->immediate_exit before the cpu->exit_request
          * write in kvm_cpu_exec.
          */
@@ -2434,7 +2434,7 @@ int kvm_cpu_exec(CPUState *cpu)
     DPRINTF("kvm_cpu_exec()\n");
 
     if (kvm_arch_process_async_events(cpu)) {
-        atomic_set(&cpu->exit_request, 0);
+        qatomic_set(&cpu->exit_request, 0);
         return EXCP_HLT;
     }
 
@@ -2450,7 +2450,7 @@ int kvm_cpu_exec(CPUState *cpu)
         }
 
         kvm_arch_pre_run(cpu, run);
-        if (atomic_read(&cpu->exit_request)) {
+        if (qatomic_read(&cpu->exit_request)) {
             DPRINTF("interrupt exit requested\n");
             /*
              * KVM requires us to reenter the kernel after IO exits to complete
@@ -2577,7 +2577,7 @@ int kvm_cpu_exec(CPUState *cpu)
         vm_stop(RUN_STATE_INTERNAL_ERROR);
     }
 
-    atomic_set(&cpu->exit_request, 0);
+    qatomic_set(&cpu->exit_request, 0);
     return ret;
 }
 
@@ -2994,7 +2994,7 @@ int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
     have_sigbus_pending = true;
     pending_sigbus_addr = addr;
     pending_sigbus_code = code;
-    atomic_set(&cpu->exit_request, 1);
+    qatomic_set(&cpu->exit_request, 1);
     return 0;
 #else
     return 1;