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Message-ID: <ZUN+sBGnyT2Op7r5@lzaremba-mobl.ger.corp.intel.com> Date: Thu, 2 Nov 2023 11:49:20 +0100 From: Larysa Zaremba <larysa.zaremba@...el.com> To: Björn Töpel <bjorn@...nel.org> CC: Andrii Nakryiko <andrii@...nel.org>, Mykola Lysenko <mykolal@...com>, <bpf@...r.kernel.org>, Daniel Borkmann <daniel@...earbox.net>, <netdev@...r.kernel.org>, Björn Töpel <bjorn@...osinc.com>, Alexei Starovoitov <ast@...nel.org>, <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH bpf] selftests/bpf: Fix broken build where char is unsigned On Thu, Nov 02, 2023 at 11:35:37AM +0100, Björn Töpel wrote: > From: Björn Töpel <bjorn@...osinc.com> > > There are architectures where char is not signed. If so, the following > error is triggered: > > | xdp_hw_metadata.c:435:42: error: result of comparison of constant -1 \ > | with expression of type 'char' is always true \ > | [-Werror,-Wtautological-constant-out-of-range-compare] > | 435 | while ((opt = getopt(argc, argv, "mh")) != -1) { > | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~ > | 1 error generated. > > Correct by changing the char to int. > > Fixes: bb6a88885fde ("selftests/bpf: Add options and frags to xdp_hw_metadata") > Signed-off-by: Björn Töpel <bjorn@...osinc.com> Acked-by: Larysa Zaremba <larysa.zaremba@...el.com> > --- > tools/testing/selftests/bpf/xdp_hw_metadata.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c > index 17c0f92ff160..c3ba40d0b9de 100644 > --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c > +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c > @@ -430,7 +430,7 @@ static void print_usage(void) > > static void read_args(int argc, char *argv[]) > { > - char opt; > + int opt; > > while ((opt = getopt(argc, argv, "mh")) != -1) { > switch (opt) { > > base-commit: cb3c6a58be50c65014296aa3455cae0fa1e82eac > -- > 2.40.1 > >
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