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qemu/atomic.h: rename atomic_ to qatomic_

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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>
This commit is contained in:
Stefan Hajnoczi 2020-09-23 11:56:46 +01:00
parent ed7db34b5a
commit d73415a315
133 changed files with 1041 additions and 1018 deletions
Download patch file Download diff file Expand all files Collapse all files

15
block/block-backend.c
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@ -1353,12 +1353,12 @@ int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
void blk_inc_in_flight(BlockBackend *blk)
{
atomic_inc(&blk->in_flight);
qatomic_inc(&blk->in_flight);
}
void blk_dec_in_flight(BlockBackend *blk)
{
atomic_dec(&blk->in_flight);
qatomic_dec(&blk->in_flight);
aio_wait_kick();
}
@ -1720,7 +1720,7 @@ void blk_drain(BlockBackend *blk)
/* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(blk_get_aio_context(blk),
atomic_mb_read(&blk->in_flight) > 0);
qatomic_mb_read(&blk->in_flight) > 0);
if (bs) {
bdrv_drained_end(bs);
@ -1739,7 +1739,7 @@ void blk_drain_all(void)
aio_context_acquire(ctx);
/* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(ctx, atomic_mb_read(&blk->in_flight) > 0);
AIO_WAIT_WHILE(ctx, qatomic_mb_read(&blk->in_flight) > 0);
aio_context_release(ctx);
}
@ -2346,6 +2346,7 @@ void blk_io_limits_update_group(BlockBackend *blk, const char *group)
static void blk_root_drained_begin(BdrvChild *child)
{
BlockBackend *blk = child->opaque;
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
if (++blk->quiesce_counter == 1) {
if (blk->dev_ops && blk->dev_ops->drained_begin) {
@ -2356,8 +2357,8 @@ static void blk_root_drained_begin(BdrvChild *child)
/* Note that blk->root may not be accessible here yet if we are just
* attaching to a BlockDriverState that is drained. Use child instead. */
if (atomic_fetch_inc(&blk->public.throttle_group_member.io_limits_disabled) == 0) {
throttle_group_restart_tgm(&blk->public.throttle_group_member);
if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) {
throttle_group_restart_tgm(tgm);
}
}
@ -2374,7 +2375,7 @@ static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter)
assert(blk->quiesce_counter);
assert(blk->public.throttle_group_member.io_limits_disabled);
atomic_dec(&blk->public.throttle_group_member.io_limits_disabled);
qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled);
if (--blk->quiesce_counter == 0) {
if (blk->dev_ops && blk->dev_ops->drained_end) {