selftests/net: tcp_mmap: fix clang warning for target arch PowerPC

When size_t maps to unsigned int (e.g. on 32-bit powerpc), then the
comparison with 1<<35 is always true. Clang 9 threw:
warning: result of comparison of constant 34359738368 with \
expression of type 'size_t' (aka 'unsigned int') is always true \
[-Wtautological-constant-out-of-range-compare]
        while (total < FILE_SZ) {

Tested: make -C tools/testing/selftests TARGETS="net" run_tests

Fixes: 192dc405f308 ("selftests: net: add tcp_mmap program")
Signed-off-by: Tanner Love <tannerlove@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c
index 4555f88252bafd31d6c225590316f03b08d3b132..a61b7b3da5496285876b0e16b18a3060850b0803 100644 (file)
--- a/tools/testing/selftests/net/tcp_mmap.c
+++ b/tools/testing/selftests/net/tcp_mmap.c
@@ -344,7 +344,7 @@ int main(int argc, char *argv[])
 {
        struct sockaddr_storage listenaddr, addr;
        unsigned int max_pacing_rate = 0;
-       size_t total = 0;
+       uint64_t total = 0;
        char *host = NULL;
        int fd, c, on = 1;
        char *buffer;
@@ -473,12 +473,12 @@ int main(int argc, char *argv[])
                zflg = 0;
        }
        while (total < FILE_SZ) {
-               ssize_t wr = FILE_SZ - total;
+               int64_t wr = FILE_SZ - total;
 
                if (wr > chunk_size)
                        wr = chunk_size;
                /* Note : we just want to fill the pipe with 0 bytes */
-               wr = send(fd, buffer, wr, zflg ? MSG_ZEROCOPY : 0);
+               wr = send(fd, buffer, (size_t)wr, zflg ? MSG_ZEROCOPY : 0);
                if (wr <= 0)
                        break;
                total += wr;