linux-kernel - Re: [PATCH] objtool: Fix clang enum conversion warning

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Date:   Tue, 26 Dec 2017 19:35:12 -0500
From:   Nick Desaulniers <nick.desaulniers@...il.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] objtool: Fix clang enum conversion warning

I sent a similar one recently:
https://patchwork.kernel.org/patch/10131815/ (maybe Josh is just
forwarding me an earlier fix?)

Reviewed-by: Nick Desaulniers <nick.desaulniers@...il.com>

On Tue, Dec 26, 2017 at 4:27 PM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> From: Lukas Bulwahn <lukas.bulwahn@...il.com>
>
> Fix the following clang enum conversion warning:
>
>   arch/x86/decode.c:141:20: error: implicit conversion from enumeration
>   type 'enum op_src_type' to different enumeration
>   type 'enum op_dest_type' [-Werror,-Wenum-conversion]
>
>     op->dest.type = OP_SRC_REG;
>                   ~ ^~~~~~~~~~
>
> It just happened to work before because OP_SRC_REG and OP_DEST_REG have
> the same value.
>
> Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  tools/objtool/arch/x86/decode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
> index 8acfc47af70e..540a209b78ab 100644
> --- a/tools/objtool/arch/x86/decode.c
> +++ b/tools/objtool/arch/x86/decode.c
> @@ -138,7 +138,7 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
>                         *type = INSN_STACK;
>                         op->src.type = OP_SRC_ADD;
>                         op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
> -                       op->dest.type = OP_SRC_REG;
> +                       op->dest.type = OP_DEST_REG;
>                         op->dest.reg = CFI_SP;
>                 }
>                 break;
> --
> 2.13.6
>