linux-kernel - Re: linux-next: build failure after merge of the kspp-gustavo tree

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Date:   Thu, 14 Oct 2021 19:07:52 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the kspp-gustavo tree

Stephen,

On Fri, Oct 15, 2021 at 10:48:40AM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the kspp-gustavo tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> In file included from include/linux/bpf_verifier.h:9,
>                  from kernel/bpf/verifier.c:12:
> kernel/bpf/verifier.c: In function 'jit_subprogs':
> include/linux/filter.h:366:4: error: cast between incompatible function types from 'unsigned int (*)(const void *, const struct bpf_insn *)' to 'u64 (*)(u64,  u64,  u64,  u64,  u64)' {aka 'long long unsigned int (*)(long long unsigned int,  long long unsigned int,  long long unsigned int,  long long unsigned int,  long long unsigned int)'} [-Werror=cast-function-type]
>   366 |   ((u64 (*)(u64, u64, u64, u64, u64))(x))
[..]
> 
>   21078041965e ("Makefile: Enable -Wcast-function-type")
> 
> I have used the kspp-gustavo tree from next-20211013 for today.

Please, merge my -next tree. All the warnings above are already fixed in
bpf-next by commit:

	3d717fad5081 ("bpf: Replace "want address" users of BPF_CAST_CALL with BPF_CALL_IMM")

So, once you merge bpf-next, those warnings will go away.

Thanks
--
Gustavo