[PATCH] tools/io_uring/io_uring-cp: fix compile warning in copy_file()

[Xiongfeng Wang <wangxiongfeng2@huawei.com>]

Build tools/io_uring emits the following warnings.

io_uring-cp.c: In function ‘copy_file’:
io_uring-cp.c:158:17: warning: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Wsign-compare]
  158 |   if (had_reads != reads) {
      |                 ^~
io_uring-cp.c:201:24: warning: comparison of integer expressions of different signedness: ‘__s32’ {aka ‘int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
  201 |    } else if (cqe->res != data->iov.iov_len) {
      |                        ^~

Change the type of 'had_reads' to 'unsigned long' to fix the first
compile warning. For the second warning, cast 'cqe->res' to
'__kernel_size_t' before comparison to fix it.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
---
 tools/io_uring/io_uring-cp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/io_uring/io_uring-cp.c b/tools/io_uring/io_uring-cp.c
index d9bd6f5f8f46..643c226f91ac 100644
--- a/tools/io_uring/io_uring-cp.c
+++ b/tools/io_uring/io_uring-cp.c
@@ -131,7 +131,8 @@ static int copy_file(struct io_uring *ring, off_t insize)
 	writes = reads = offset = 0;
 
 	while (insize || write_left) {
-		int had_reads, got_comp;
+		unsigned long had_reads;
+		int got_comp;
 
 		/*
 		 * Queue up as many reads as we can
@@ -198,7 +199,7 @@ static int copy_file(struct io_uring *ring, off_t insize)
 				fprintf(stderr, "cqe failed: %s\n",
 						strerror(-cqe->res));
 				return 1;
-			} else if (cqe->res != data->iov.iov_len) {
+			} else if ((__kernel_size_t)cqe->res != data->iov.iov_len) {
 				/* Short read/write, adjust and requeue */
 				data->iov.iov_base += cqe->res;
 				data->iov.iov_len -= cqe->res;
-- 
2.20.1