From:   =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>
To:     Randy Dunlap <rdunlap@infradead.org>, linux-kernel@vger.kernel.org
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        kernel test robot <lkp@intel.com>,
        Pu Lehui <pulehui@huawei.com>,
        Luke Nelson <luke.r.nels@gmail.com>,
        Xi Wang <xi.wang@gmail.com>, bpf@vger.kernel.org,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        John Fastabend <john.fastabend@gmail.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv@lists.infradead.org
Subject: Re: [PATCH bpf v2] riscv, bpf: fix patch_text implicit declaration
In-Reply-To: <20230227072016.14618-1-rdunlap@infradead.org>
References: <20230227072016.14618-1-rdunlap@infradead.org>
Date:   Mon, 27 Feb 2023 08:31:01 +0100
Message-ID: <87k003a7ka.fsf@all.your.base.are.belong.to.us>
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Randy Dunlap <rdunlap@infradead.org> writes:

> bpf_jit_comp64.c uses patch_text(), so add <asm/patch.h> to it
> to prevent the build error:
>
> ../arch/riscv/net/bpf_jit_comp64.c: In function 'bpf_arch_text_poke':
> ../arch/riscv/net/bpf_jit_comp64.c:691:23: error: implicit declaration of=
 function 'patch_text'; did you mean 'path_get'? [-Werror=3Dimplicit-functi=
on-declaration]
>   691 |                 ret =3D patch_text(ip, new_insns, ninsns);
>       |                       ^~~~~~~~~~
>
> Fixes: 596f2e6f9cf4 ("riscv, bpf: Add bpf_arch_text_poke support for RV64=
")
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Reported-by: kernel test robot <lkp@intel.com>
> Link: https://lore.kernel.org/r/202302271000.Aj4nMXbZ-lkp@intel.com
> Cc: Pu Lehui <pulehui@huawei.com>
> Cc: Luke Nelson <luke.r.nels@gmail.com>
> Cc: Xi Wang <xi.wang@gmail.com>
> Cc: bpf@vger.kernel.org
> Cc: Alexei Starovoitov <ast@kernel.org>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: John Fastabend <john.fastabend@gmail.com>
> Cc: Andrii Nakryiko <andrii@kernel.org>
> Cc: Paul Walmsley <paul.walmsley@sifive.com>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Albert Ou <aou@eecs.berkeley.edu>
> Cc: "Bj=C3=B6rn T=C3=B6pel" <bjorn@kernel.org>
> Cc: linux-riscv@lists.infradead.org
> ---
> v2: add header file directly to bpf_jit_comp64.c (Pu Lehui)
>     change patch target to bpf (for fixes)

Thanks, Randy!

For the curious; The asm/patch.h file was picked via UPROBES (via
PERF_EVENTS=3Dy). For PERF_EVENTS=3Dn, you get the build error.


Acked-by: Bj=C3=B6rn T=C3=B6pel <bjorn@rivosinc.com>