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From: Steven Rostedt <rostedt@goodmis.org>
To: Alan Kao <alankao@andestech.com>
Cc: Palmer Dabbelt <palmer@sifive.com>, Albert Ou <albert@sifive.com>,
	<linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Greentime Hu <greentime@andestech.com>,
	Zong Li <zong@andestech.com>
Subject: Re: [PATCH] riscv/ftrace: Fix the problem modules cannot find _mcount
Date: Tue, 8 May 2018 09:11:42 -0400	[thread overview]
Message-ID: <20180508091142.12b5231a@gandalf.local.home> (raw)
In-Reply-To: <1525749717-384-1-git-send-email-alankao@andestech.com>

On Tue, 8 May 2018 11:21:57 +0800
Alan Kao <alankao@andestech.com> wrote:

> Enabling ftrace and module support at the same time fails the kernel
> build process, because modules cannot find the _mcount symbol.  This
> patch fixes this issue.

I think you have a much bigger issue.

> 
> Signed-off-by: Alan Kao <alankao@andestech.com>
> Cc: Greentime Hu <greentime@andestech.com>
> Cc: Zong Li <zong@andestech.com>
> ---
>  arch/riscv/kernel/mcount.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S
> index ce9bdc57a2a1..5721624886a1 100644
> --- a/arch/riscv/kernel/mcount.S
> +++ b/arch/riscv/kernel/mcount.S
> @@ -126,5 +126,5 @@ do_trace:
>  	RESTORE_ABI_STATE
>  	ret
>  ENDPROC(_mcount)
> -EXPORT_SYMBOL(_mcount)
>  #endif
> +EXPORT_SYMBOL(_mcount)

How does this work? How do you export _mcount if _mcount isn't even
defined?

-- Steve

  reply	other threads:[~2018-05-08 13:11 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08  3:21 Alan Kao
2018-05-08 13:11 ` Steven Rostedt [this message]
2018-05-09  2:36   ` Alan Kao
2018-05-09  3:02     ` Steven Rostedt
2018-06-04 20:30 ` Palmer Dabbelt
2018-06-04 20:30   ` [PATCH] riscv/ftrace: Export _mcount when FUNCTION_GRAPH_TRACER isn't set Palmer Dabbelt
2018-06-05  1:12     ` Alan Kao

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