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/hw/core/cpu.c b/hw/core/cpu.c
index 8f65383ffb..c55c09f734 100644
--- a/hw/core/cpu.c
+++ b/hw/core/cpu.c
@@ -111,10 +111,10 @@ void cpu_reset_interrupt(CPUState *cpu, int mask)
 
 void cpu_exit(CPUState *cpu)
 {
-    atomic_set(&cpu->exit_request, 1);
+    qatomic_set(&cpu->exit_request, 1);
     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
     smp_wmb();
-    atomic_set(&cpu->icount_decr_ptr->u16.high, -1);
+    qatomic_set(&cpu->icount_decr_ptr->u16.high, -1);
 }
 
 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
@@ -261,7 +261,7 @@ static void cpu_common_reset(DeviceState *dev)
     cpu->halted = cpu->start_powered_off;
     cpu->mem_io_pc = 0;
     cpu->icount_extra = 0;
-    atomic_set(&cpu->icount_decr_ptr->u32, 0);
+    qatomic_set(&cpu->icount_decr_ptr->u32, 0);
     cpu->can_do_io = 1;
     cpu->exception_index = -1;
     cpu->crash_occurred = false;