Add arm64 memory barriers support

making liburing on arm64 platform failed. let's support it.

root@Kylin:/# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux buster/sid"

root@Kylin:/# gcc -v
gcc version 8.2.0 (Debian 8.2.0-20)

root@Kylin:~/liburing# make
make[1]: Entering directory '/root/liburing/src'
cc -g -fomit-frame-pointer -O2 -Wall -Iinclude/ -c -o setup.ol setup.c
In file included from include/liburing.h:14,
                 from setup.c:10:
include/liburing.h: In function 'io_uring_cq_advance':
include/liburing/barrier.h:73:2: warning: implicit declaration of function 'smp_mb'; did you mean 'smp_wmb'? [-Wimplicit-function-declaration]
  smp_mb();    \
  ^~~~~~
include/liburing.h:111:3: note: in expansion of macro 'smp_store_release'
   smp_store_release(cq->khead, *cq->khead + nr);
   ^~~~~~~~~~~~~~~~~

Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions