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, 7 insertions, 7 deletions

diff --git a/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h b/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h
index acd4c8346d..7b4062a1a1 100644
--- a/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h
+++ b/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h
@@ -68,7 +68,7 @@ static inline int pvrdma_idx_valid(uint32_t idx, uint32_t max_elems)
 
 static inline int32_t pvrdma_idx(int *var, uint32_t max_elems)
 {
-	const unsigned int idx = atomic_read(var);
+	const unsigned int idx = qatomic_read(var);
 
 	if (pvrdma_idx_valid(idx, max_elems))
 		return idx & (max_elems - 1);
@@ -77,17 +77,17 @@ static inline int32_t pvrdma_idx(int *var, uint32_t max_elems)
 
 static inline void pvrdma_idx_ring_inc(int *var, uint32_t max_elems)
 {
-	uint32_t idx = atomic_read(var) + 1;	/* Increment. */
+	uint32_t idx = qatomic_read(var) + 1;	/* Increment. */
 
 	idx &= (max_elems << 1) - 1;		/* Modulo size, flip gen. */
-	atomic_set(var, idx);
+	qatomic_set(var, idx);
 }
 
 static inline int32_t pvrdma_idx_ring_has_space(const struct pvrdma_ring *r,
 					      uint32_t max_elems, uint32_t *out_tail)
 {
-	const uint32_t tail = atomic_read(&r->prod_tail);
-	const uint32_t head = atomic_read(&r->cons_head);
+	const uint32_t tail = qatomic_read(&r->prod_tail);
+	const uint32_t head = qatomic_read(&r->cons_head);
 
 	if (pvrdma_idx_valid(tail, max_elems) &&
 	    pvrdma_idx_valid(head, max_elems)) {
@@ -100,8 +100,8 @@ static inline int32_t pvrdma_idx_ring_has_space(const struct pvrdma_ring *r,
 static inline int32_t pvrdma_idx_ring_has_data(const struct pvrdma_ring *r,
 					     uint32_t max_elems, uint32_t *out_head)
 {
-	const uint32_t tail = atomic_read(&r->prod_tail);
-	const uint32_t head = atomic_read(&r->cons_head);
+	const uint32_t tail = qatomic_read(&r->prod_tail);
+	const uint32_t head = qatomic_read(&r->cons_head);
 
 	if (pvrdma_idx_valid(tail, max_elems) &&
 	    pvrdma_idx_valid(head, max_elems)) {