linux-kernel - Re: arch/arm64/kernel/entry-ftrace.S:238: undefined reference to `ftrace_graph

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Date:   Fri, 6 Dec 2019 12:41:29 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Torsten Duwe <duwe@....de>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: arch/arm64/kernel/entry-ftrace.S:238: undefined reference to
 `ftrace_graph_caller'

On Fri, Dec 06, 2019 at 03:08:40PM +0800, kbuild test robot wrote:
> Hi Torsten,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   b0d4beaa5a4b7d31070c41c2e50740304a3f1138
> commit: 3b23e4991fb66f6d152f9055ede271a726ef9f21 arm64: implement ftrace with regs

> All errors (new ones prefixed by >>):
> 
>    arch/arm64/kernel/entry-ftrace.o: In function `skip_ftrace_call':
> >> arch/arm64/kernel/entry-ftrace.S:238: undefined reference to `ftrace_graph_caller'
>    arch/arm64/kernel/entry-ftrace.S:238:(.text+0x3c): relocation truncated to fit: R_AARCH64_CONDBR19 against undefined symbol `ftrace_graph_caller'
>    arch/arm64/kernel/entry-ftrace.S:243: undefined reference to `ftrace_graph_caller'
>    arch/arm64/kernel/entry-ftrace.S:243:(.text+0x54): relocation truncated to fit: R_AARCH64_CONDBR19 against undefined symbol `ftrace_graph_caller'

This is my bad; I messed up the ifdeffery so that ftrace_graph_caller
isn't defined for CONFIG_DYNAMIC_FTRACE && CONFIG_FUNCTION_GRAPH_TRACER.

I will send a patch shortly. Sorry about this.

Mark.