Re: [PATCH bpf-next] riscv, bpf: fix patch_text implicit declaration

[Pu Lehui]

On 2023/2/27 12:02, Randy Dunlap wrote:
> bpf_jit_comp64.c uses patch_text(), so add it to a local header file
> 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@xxxxxxxxxxxxx>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Link: https://lore.kernel.org/r/202302271000.Aj4nMXbZ-lkp@xxxxxxxxx
> Cc: Pu Lehui <pulehui@xxxxxxxxxx>
> Cc: Luke Nelson <luke.r.nels@xxxxxxxxx>
> Cc: Xi Wang <xi.wang@xxxxxxxxx>
> Cc: bpf@xxxxxxxxxxxxxxx
> Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
> Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> Cc: John Fastabend <john.fastabend@xxxxxxxxx>
> Cc: Andrii Nakryiko <andrii@xxxxxxxxxx>
> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
> Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
> Cc: "Björn Töpel" <bjorn@xxxxxxxxxx>
> Cc: linux-riscv@xxxxxxxxxxxxxxxxxxx
> ---
> What is the proper path to have this merged soon to stop build
> errors?
>
>   arch/riscv/net/bpf_jit.h |    1 +
>   1 file changed, 1 insertion(+)
>
> diff -- a/arch/riscv/net/bpf_jit.h b/arch/riscv/net/bpf_jit.h
> --- a/arch/riscv/net/bpf_jit.h
> +++ b/arch/riscv/net/bpf_jit.h
> @@ -12,6 +12,7 @@
>   #include <linux/bpf.h>
>   #include <linux/filter.h>
>   #include <asm/cacheflush.h>
> +#include <asm/patch.h>
>   

Thanks Randy. Since patch_text is only used in riscv64 at present, I 
think it is appropriate to add it to arch/riscv/net/bpf_jit_comp64.c

>   static inline bool rvc_enabled(void)
>   {