linux-kernel - Re: [PATCH bpf v2] riscv, bpf: fix patch

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Date:   Mon, 27 Feb 2023 08:31:01 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Pu Lehui <pulehui@...wei.com>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH bpf v2] riscv, bpf: fix patch_text implicit declaration

Randy Dunlap <rdunlap@...radead.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=implicit-function-declaration]
>   691 |                 ret = patch_text(ip, new_insns, ninsns);
>       |                       ^~~~~~~~~~
>
> Fixes: 596f2e6f9cf4 ("riscv, bpf: Add bpf_arch_text_poke support for RV64")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/r/202302271000.Aj4nMXbZ-lkp@intel.com
> Cc: Pu Lehui <pulehui@...wei.com>
> Cc: Luke Nelson <luke.r.nels@...il.com>
> Cc: Xi Wang <xi.wang@...il.com>
> Cc: bpf@...r.kernel.org
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Andrii Nakryiko <andrii@...nel.org>
> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: "Björn Töpel" <bjorn@...nel.org>
> Cc: linux-riscv@...ts.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=y). For PERF_EVENTS=n, you get the build error.


Acked-by: Björn Töpel <bjorn@...osinc.com>