linux-kernel - Re: [PATCH bpf] selftests/bpf: Fix broken build where char is unsigned

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Message-ID: <20231102111433.GA364395@mutt>
Date:   Thu, 2 Nov 2023 12:14:33 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
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,
        Larysa Zaremba <larysa.zaremba@...el.com>
Subject: Re: [PATCH bpf] selftests/bpf: Fix broken build where char is
 unsigned

On 2023-11-02 11:35, 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>

Thank you for the patch.
I saw the same failure when I built selftests/bpf for arm64.

With this patch ontop of today's next-20231102, fixes that build issue.

Tested-by: Anders Roxell <anders.roxell@...aro.org>


Cheers,
Anders

> ---
>  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
>