linux-kernel - Re: [PATCH] arm64: ftrace: fix build error with CONFIG_FUNCTION_GRAPH

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Date:   Fri, 30 Jun 2023 17:02:39 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Mark Rutland <mark.rutland@....com>,
        Donglin Peng <pengdonglin@...gfor.com.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Florent Revest <revest@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: ftrace: fix build error with
 CONFIG_FUNCTION_GRAPH_TRACER=n

On Fri, Jun 23, 2023 at 05:21:55PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> It appears that a merge conflict ended up hiding a newly added constant
> in some configurations:
> 
> arch/arm64/kernel/entry-ftrace.S: Assembler messages:
> arch/arm64/kernel/entry-ftrace.S:59: Error: undefined symbol FTRACE_OPS_DIRECT_CALL used as an immediate value
> 
> FTRACE_OPS_DIRECT_CALL is still used when CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
> is enabled, even if CONFIG_FUNCTION_GRAPH_TRACER is disabled, so change the
> ifdef accordingly.
> 
> Fixes: 3646970322464 ("arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm64/kernel/asm-offsets.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
> index 757d01a68ffd0..5ff1942b04fcf 100644
> --- a/arch/arm64/kernel/asm-offsets.c
> +++ b/arch/arm64/kernel/asm-offsets.c
> @@ -213,9 +213,9 @@ int main(void)
>    DEFINE(FGRET_REGS_X7,			offsetof(struct fgraph_ret_regs, regs[7]));
>    DEFINE(FGRET_REGS_FP,			offsetof(struct fgraph_ret_regs, fp));
>    DEFINE(FGRET_REGS_SIZE,		sizeof(struct fgraph_ret_regs));
> +#endif
>  #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
>    DEFINE(FTRACE_OPS_DIRECT_CALL,	offsetof(struct ftrace_ops, direct_call));
> -#endif
>  #endif
>    return 0;
>  }

Acked-by: Catalin Marinas <catalin.marinas@....com>

Steven, since the fixed commit went in via your tree, could you please
pick this up as well for -rc1? Otherwise I'll queue it for -rc2 once the
ftrace changes turn up in -rc1.

Thanks.

-- 
Catalin