tools/io_uring: fix compile breakage

It would seem none of the kernel continuous integration does this:
    $ cd tools/io_uring
    $ make

Otherwise it may have noticed:
   cc -Wall -Wextra -g -D_GNU_SOURCE   -c -o io_uring-bench.o
	 io_uring-bench.c
io_uring-bench.c:133:12: error: static declaration of ‘gettid’
	 follows non-static declaration
  133 | static int gettid(void)
      |            ^~~~~~
In file included from /usr/include/unistd.h:1170,
                 from io_uring-bench.c:27:
/usr/include/x86_64-linux-gnu/bits/unistd_ext.h:34:16: note:
	 previous declaration of ‘gettid’ was here
   34 | extern __pid_t gettid (void) __THROW;
      |                ^~~~~~
make: *** [<builtin>: io_uring-bench.o] Error 1

The problem on Ubuntu 20.04 (with lk 5.9.0-rc5) is that unistd.h
already defines gettid(). So prefix the local definition with
"lk_".

Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/tools/io_uring/io_uring-bench.c b/tools/io_uring/io_uring-bench.c
index 0f257139b003e117eee62b82c87e2f66a20f8e36..7703f011838540e66061cd04bb0b1792304ded13 100644 (file)
--- a/tools/io_uring/io_uring-bench.c
+++ b/tools/io_uring/io_uring-bench.c
@@ -130,7 +130,7 @@ static int io_uring_register_files(struct submitter *s)
                                        s->nr_files);
 }
 
-static int gettid(void)
+static int lk_gettid(void)
 {
        return syscall(__NR_gettid);
 }
@@ -281,7 +281,7 @@ static void *submitter_fn(void *data)
        struct io_sq_ring *ring = &s->sq_ring;
        int ret, prepped;
 
-       printf("submitter=%d\n", gettid());
+       printf("submitter=%d\n", lk_gettid());
 
        srand48_r(pthread_self(), &s->rand);