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>

2 files changed, 8 insertions, 8 deletions

diff --git a/hw/intc/rx_icu.c b/hw/intc/rx_icu.c
index df4b6a8d22..94e17a9dea 100644
--- a/hw/intc/rx_icu.c
+++ b/hw/intc/rx_icu.c
@@ -81,8 +81,8 @@ static void rxicu_request(RXICUState *icu, int n_IRQ)
     int enable;
 
     enable = icu->ier[n_IRQ / 8] & (1 << (n_IRQ & 7));
-    if (n_IRQ > 0 && enable != 0 && atomic_read(&icu->req_irq) < 0) {
-        atomic_set(&icu->req_irq, n_IRQ);
+    if (n_IRQ > 0 && enable != 0 && qatomic_read(&icu->req_irq) < 0) {
+        qatomic_set(&icu->req_irq, n_IRQ);
         set_irq(icu, n_IRQ, rxicu_level(icu, n_IRQ));
     }
 }
@@ -124,10 +124,10 @@ static void rxicu_set_irq(void *opaque, int n_IRQ, int level)
     }
     if (issue == 0 && src->sense == TRG_LEVEL) {
         icu->ir[n_IRQ] = 0;
-        if (atomic_read(&icu->req_irq) == n_IRQ) {
+        if (qatomic_read(&icu->req_irq) == n_IRQ) {
             /* clear request */
             set_irq(icu, n_IRQ, 0);
-            atomic_set(&icu->req_irq, -1);
+            qatomic_set(&icu->req_irq, -1);
         }
         return;
     }
@@ -144,11 +144,11 @@ static void rxicu_ack_irq(void *opaque, int no, int level)
     int n_IRQ;
     int max_pri;
 
-    n_IRQ = atomic_read(&icu->req_irq);
+    n_IRQ = qatomic_read(&icu->req_irq);
     if (n_IRQ < 0) {
         return;
     }
-    atomic_set(&icu->req_irq, -1);
+    qatomic_set(&icu->req_irq, -1);
     if (icu->src[n_IRQ].sense != TRG_LEVEL) {
         icu->ir[n_IRQ] = 0;
     }
diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c
index af611f8db8..f42fd695d8 100644
--- a/hw/intc/sifive_plic.c
+++ b/hw/intc/sifive_plic.c
@@ -89,12 +89,12 @@ static void sifive_plic_print_state(SiFivePLICState *plic)
 
 static uint32_t atomic_set_masked(uint32_t *a, uint32_t mask, uint32_t value)
 {
-    uint32_t old, new, cmp = atomic_read(a);
+    uint32_t old, new, cmp = qatomic_read(a);
 
     do {
         old = cmp;
         new = (old & ~mask) | (value & mask);
-        cmp = atomic_cmpxchg(a, old, new);
+        cmp = qatomic_cmpxchg(a, old, new);
     } while (old != cmp);
 
     return old;